ABB KENT-TAYLOR · ABB Kent-Taylor is an established world force in the design and manufacture of ... 8.1 Checking the Zirconia Cell ... Fault Finding Z-MT Oxygen Analyser

ABB Instrumentation

Installation Guide

Specific to order number:EXP/N/17371/TJA

& for use with ZMT ElectronicsUnit code number:

ZMT/301/000000/4002CE

EXFG Probe for use withZ-MT Oxygen AnalyzerSystem

ABB KENT-TAYLOR

Health and SafetyTo ensure that our products are safe and without risk to health, the following points must be noted:

1. The relevant sections of these instructions must be read carefully before proceeding.

2. Warning labels on containers and packages must be observed.

3. Installation, operation, maintenance and servicing must only be carried out by suitably trained personnel and in accordance with theinformation given.

4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when operating in conditions of high pressureand/or temperature.

5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept dry. Normal safe handling proceduresmust be used.

6. When disposing of chemicals ensure that no two chemicals are mixed.

Safety advice concerning the use of the equipment described in this manual or any relevant hazard data sheets (where applicable) may beobtained from the Company address on the back cover, together with servicing and spares information.

Note.Clarification of an instruction or additional information.

Information.Further reference for more detailed information ortechnical details.

Use of Instructions

Warning.An instruction that draws attention to the risk of injury ordeath.

Caution.An instruction that draws attention to the risk of damage tothe product, process or surroundings.

Although Warning hazards are related to personal injury, and Caution hazards are associated with equipment or property damage,it must be understood that operation of damaged equipment could, under certain operational conditions, result in degradedprocess system performance leading to personal injury or death. Therefore, comply fully with all Warning and Caution notices.

Information in this manual is intended only to assist our customers in the efficient operation of our equipment. Use of this manualfor any other purpose is specifically prohibited and its contents are not to be reproduced in full or part without prior approval ofTechnical Communications Department, ABB Kent-Taylor.

The Company

ABB Kent-Taylor is an established world force in the design and manufacture ofinstrumentation for industrial process control, flow measurement, gas and liquid analysis andenvironmental applications.

As a part of ABB, a world leader in process automation technology, we offer customersapplication expertise, service and support worldwide.

We are committed to teamwork, high quality manufacturing, advanced technology andunrivalled service and support.

The quality, accuracy and performance of the Company’s products result from over 100 yearsexperience, combined with a continuous program of innovative design and development toincorporate the latest technology.

The NAMAS Calibration Laboratory No. 0255(B) is just one of the ten flow calibration plantsoperated by the Company, and is indicative of ABB Kent-Taylor’s dedication to quality andaccuracy.

RE

GIS T E R E D F

IRM

BS EN ISO 9001

St Neots, U.K. – Cert. No. Q5907Stonehouse, U.K. – Cert. No. FM 21106

Stonehouse, U.K. – Cert. No. 0255

EN 29001 (ISO 9001)

Lenno, Italy – Cert. No. 9/90A

1

CONTENTS

Section Page

1 INTRODUCTION ......................................................... 21.1 Documentation ................................................. 21.2 Certification ...................................................... 21.3 System Overview ............................................. 31.4 Principle of Operation ...................................... 4

2 PREPARATION ........................................................... 52.1 Checking the Code Number ............................. 52.2 Accessories Check ........................................... 6

2.2.1 Test Gas Connector Kit ...................... 62.2.2 Probe Flange ...................................... 62.2.3 Mounting Plates .................................. 6

3 INSTALLATION ........................................................... 73.1 Siting ............................................................ 73.2 Mounting ........................................................... 8

4 ELECTRICAL CONNECTIONS .................................. 94.1 Conduit, Cable and Gland Specifications ........ 94.2 Conduit and Cable Options ............................ 10

4.2.1 Access to Probe Terminals ............... 104.2.2 Single Conduit Probe Connections .. 104.2.3 Dual Conduit Probe Connections ..... 114.2.4 Dual Cable Probe Connections ........ 12

5 PIPE CONNECTIONS ............................................... 135.1 Pipe Connections ........................................... 13

5.1.1 External Reference Air Connection .. 135.1.2 Vent Connection ............................... 13

5.2 Resealing the Probe Head ............................. 13

6 OPERATION .............................................................. 14

7 CALIBRATION ........................................................ 147.1 Test Gas Connection ...................................... 14

8 FAULT FINDING........................................................ 158.1 Checking the Zirconia Cell ............................. 15

8.1.1 Checking the Control Thermocouple 158.1.2 Checking the Heater Resistance ...... 16

8.2 Checking the Trip Thermocouple ................... 17

Section Page

9 DISMANTLING AND RE-ASSEMBLY ...................... 189.1 Replacing the Ceramic Filter .......................... 19

9.1.1 Removing the Ceramic Filter ............ 199.1.2 Fitting the Ceramic Filter .................. 19

9.2 Replacing the Zirconia Cell ............................ 209.2.1 Removing the Zirconia Cell .............. 209.2.2 Fitting the Zirconia Cell ..................... 21

9.3 Replacing the Thermocouple/ElectrodeLead Assembly ............................................... 229.3.1 Removing the Thermocouple/

Electrode Lead Assembly ................. 229.3.2 Fitting Ceramic Insulators ................. 239.3.3 Fitting the Thermocouple/Electrode

Lead Assembly ................................. 249.4 Removing the Probe Body ............................. 259.5 Replacing the Heater Assembly ..................... 26

9.5.1 Removing the Heater Assembly ....... 269.5.2 Fitting the Heater Assembly ............. 279.5.3 Aligning the Heater Assembly .......... 28

9.6 Replacing the Trip Thermocouple Assembly . 319.6.1 Removing the Trip

Thermocouple Assembly .................. 319.6.2 Fitting the Trip Thermocouple

Assembly .......................................... 329.7 Removing Seized Screws .............................. 33

10 REPLACEMENT PARTS… ...................................... 3410.1 Illustrated Parts List ........................................ 3410.2 Mounting Plate ................................................ 3810.3 Conduit Assemblies and Special Dual Cable . 38

10.3.1 Single Conduit Assembly(combined power/signal) .................. 38

10.3.2 Dual Conduit Assembly(separate power/signal) .................... 38

10.3.3 Special Dual Cable(separate power and signal cable) ... 38

10.4 Spares Kits and Replacement Items ............. 3810.4.1 Electrode/Thermocouple

Lead Assembly ................................. 3810.4.2 Zirconia Cell ...................................... 3810.4.3 Ceramic Filter ................................... 3810.4.4 Heater ............................................... 3810.4.5 Fasteners .......................................... 38

10.5 Sealants ......................................................... 3810.6 Accessory Kits ................................................ 38

APPENDIX ................................................................ 39A1 Displayed Value (mV) v. Percentage Oxygen ... 39

2

1 INTRODUCTION

Z-MT ELECTRONICSUNIT

Product Identification

Mounting/Connections

Controls & Displays

Start-up and Operation

Programming

Calibration

Part No.IM/ZMT

PROBE

Part No.

IM/EXFG–PBZ

CertificationProduct IdentificationMechanical InstallationElectrical InstallationOperationCalibrationFault Finding Z-MT Oxygen Analyser

Fig. 1.1 EXFG Documentation

1.1 Documentation

Documentation for the ZMT Oxygen Analyzer System is shown in Fig. 1.1.

The Standard Documentation Pack is supplied with all instruments.

The Supplementary Manuals supplied depend on the specification of the instrument.

1.2 Certification

The EXFG Probe described in this manual is regarded as a certified flameproof enclosure EEx d IIB T3 (–20 to 55°C) conformingto EN50014 (1993) and EN50018 (1995). As such it is safe for use in Zone 1 hazardous areas both in and out of a flue duct (copiesof the certificate are available on request).

However, when the Tamb of 55°C is exceeded at the sensor end of the probe by process temperature, certification is notinvalidated as the hazard is that of the process and not of the certified probe.

Warning . Maximum process pressure 1.1 bar absolute. Certification is invalidated if this pressure is exceeded.

3

1 INTRODUCTION…

1.3 System Overview – Fig. 1.2

The EXFG Oxygen Probe measures oxygen concentration in flue gas using an in situ (‘wet analysis’) method. The 'wet analysis'method avoids measurement error (typically 20% of reading higher than the actual value) which would be introduced by asampling system using the ‘dry analysis’ method.

System equipment comprises the EXFG Oxygen Probe (flue-mounted) and a ZMT Zirconia Oxygen Analyzer.

During operation, a zirconia cell within the EXFG Probe is controlled by the ZMT Oxygen Analyzer at a temperature of 700°C. Thistemperature is maintained by a probe heater and control thermocouple assembly. A trip thermocouple is fitted to ensure thesurface temperature of the probe never exceeds T3 (200°C). If the heater control circuitry fails 'unsafe' a mechanically interlockedpower supply trip relay operates cutting the power supply to the probe. Therefore the system fails 'safe'.

Warning . The probe must be only be connected to a ZMT Oxygen Analyzer, otherwise probe certification may beinvalidated. Only ZMT codes ZMT/301/000000/4002CE are permissable.

An output generated at the zirconia cell is processed in the ZMT Oxygen Analyzer into a 4 to 20mA retransmission signalrepresenting 25% to 0.25% O2.

NON HAZARDOUS AREAHAZARDOUS AREA(Zone 1, Class IIB)

Process20°C to600°C1.1 Bar

AbsoluteMaximum(40in WG)

EXFG ProbeEEx d IIB T3 (Tamb –20°C to 55°C)to EN50014 1993 and EN50018 1995

Control ThermocoupleSignal

Mains Supply

Flue

RetransmissionOutput

Reference Air Line Entry

Regulated Reference AirUnit (003000241)

O2 mV Signal(–20 to +180mV)

1.1 BarAbsolute Maximum

Dry, Oil-freeInstrument Air(10 bar max.)

Controlled HeaterSupply

Over-temperatureTrip Thermocouple

Test GasInlet

Z-MT Oxygen Analyser

Z-MT Electronics Unit

Fig. 1.2 System Schematic

4

1.4 Principle of Operation – Fig. 1.3

The probe's zirconia cell is a thimble-shaped sensing element fitted with inner and outer electrodes at its closed end. The innerelectrode is exposed to the flue gas entering the open end of the cell; the outer electrode is supplied with reference air from aregulator and is therefore exposed to a constant partial pressure of oxygen. The cell is held at a constant 700°C by a heater andcontrol thermocouple.

Because zirconia is an electrolyte which conducts only oxygen ions at temperatures in excess of 600°C, the voltage generatedbetween the electrodes (i.e. the cell output) is a function of the ratio of the oxygen partial pressure difference between thereference electrode and the measuring electrode and its temperature. Therefore, any change in the oxygen partial pressure of theflue gas at the exposed electrode produces a change in the cell output voltage as dictated by the Nernst equation.

Cell output voltage increases logarithmically with decreasing oxygen, thus giving high sensitivity at low oxygen levels.

…1 INTRODUCTION

Thermocouple leads

Heater

Zirconia cell

Porous ceramic filter

Flame arrester

Flue gas

Measuring(inner)

electrode

Referenceelectrode

Control thermocouple

Electrode contact

Flue gas

Over-temperaturetrip thermocouple

+ ve Cell

Reference air

– ve Cell

Fig. 1.3 Probe Construction

5

2.1 Checking the Code Number – Fig. 2.1

2 PREPARATION 2 PREPARATION…

Check code number – see Table 2.1

Fig. 2.1 Checking the Code Number

2

EXFG Oxygen Analyzer System EXFG/ X X X 000

EXFG Probe Not supplied 01.64ft (0.5m) insertion length – with standard flange 13.281ft (1.0m) insertion length – with standard flange 26.562 (2.0m) insertion length – with standard flange 31.64ft (0.5m) insertion length – with ANSI flange 43.281ft (1.0m) (insertion length) – with ANSI flange 56.562 (2.0m) insertion length – with ANSI flange 6

Flexible Conduits No conduits 0

19.68ft (6.0m) Single conduit assembly – combined signal/power 132.81ft (10.0m) Single conduit assembly – combined signal/power 2

19.68ft (6.0m) Dual conduit assembly – separate signal/power 3(comprising one signal conduit and one power conduit)

32.81ft (10.0m) Dual conduit assembly – separate signal/power 4(comprising one signal conduit and one power conduit)

or

Dual Special Cables (ordered separately)SWA signal cable – EXFG/0194 (per metre, 100 metre max.)

25/20mm reducer – B11274 (qty. 2 rqd.)20mm barrier gland – (qty. 2 rqd.)

andSWA power cable – EXFG/0195 (per metre, 100 metre max.)

20mm barrier gland – B11275 (qty. 2 rqd.)

Mounting Plate Not supplied 0Mounting plate assembly – standard flange only 1

Table 2.1 Code Number Interpretation

6

2.2 Accessories Check

2.2.1 Test Gas Connector Kit – Fig. 2.2

2.2.3 Mounting Plates – Fig. 2.4

In addition to the probe flange, the probe may also be suppliedwith a mounting plate assembly if specified – see Table 2.1. Amounting plate is required if there is no existing mounting onthe flue or boiler.

Fig. 2.4 Mounting Plate (Standard Only)

…2 PREPARATION

2.2.2 Probe Flange – Fig. 2.3

Fig. 2.2 Test Gas Connector Kit Components

A – Standard Flange

Fig. 2.3 Probe Flanges

B – ANSI Flange(equivalent to 4in 150lb flange)

Six M6 studs on 5.52 (140) PCD

Dimensions in inches (mm)

0.78(20)

8.0(203)

1.26(32)

8.0(203)

0.47 (12)

9(228.6±0.4)dia.

4 Holes 0.75 (19) OD on 7.5 (190.5) PCD6 Holes 0.5 (12.5) OD on 5.52 (140) PCD 0.47 (12)

6.5(165)dia.


Connector pipe (1/4in OD)

6mm olive (spare alternative)

Nut

1/4in olive

M4/M5 spanner

7

3 INSTALLATION

Fig. 3.1 Overall Dimensions

3 INSTALLATION…


15.75 (400) 19.68 (500)or

39.37 (1000)or

78.74 (2000)

0.47 (12)

6.5(165)

ExternalEarthingScrew

6.77(172)

6.77(172)

Warning . Maximum process pressure 1.1 bar absolute. Certification is invalidated if this pressure is exceeded.

Caution . Handle with care. Avoid mechanical shock to prevent damage to the probe's internal ceramic components.

3.1 Siting – Figs. 3.1 and 3.2

Select a position where the intake is located in the main stream of flue gas. Gas temperature must be in the range 20°C to 600°C.

Avoid positions where obstructions or bends may impede gas flow or prevent insertion, or subsequent removal, of the probe.

Probe dimensions are shown in Fig 3.1. A clearance of at least 1 inch (25mm) in excess of the overall probe length is necessaryfor installation or removal procedures.

The probe can be supplied with 19.68ft (6m) or 32.81ft (10m) of flexible conduit as standard which contains cables for connectionto the ZMT Oxygen Analyzer. The probe head can accept two conduits for separate routing of signal and power cables if required.Special cables complete with appropriate glands can be provided in lengths up to 328.1ft (100m) maximum. The special cableoption is only available as a dual cable configuration comprising separate power and signal cables.

Caution . Thermal shock may break the zirconia cell if the flue is cleaned using a high pressure water hose. If thismethod of cleaning is used, remove the probe from the flue prior to cleaning.

8

…3 INSTALLATION

Information. Alternatively, drill and bolt the plate to the flue. If this method is used fit a suitable gasket betweenthe plate and the flue wall.

…3.1 Siting – Figs. 3.1 and 3.2

IP66B – Within

Environmental Limits

(NEMA 4X)A – Within

Temperature Limits

Gas Flue50°CMax.

–20°CMin.

Fig. 3.3 Mounting Procedure

Fig. 3.2 Siting Requirements

3.2 Mounting – Fig. 3.3

Warning.

• Installation and repair must only be carried out by the manufacturer, authorized agents or persons conversant with theconstruction standards for hazardous area certified equipment.

• Installation must conform to BS5345.

Cut hole 4.72 (120) min. ODWeld the mounting plate into place,concentric with the hole in the flue

Fit the probe gasket

Secure the probe and gasket usingM10 nuts and washers (x 6)

Insert the probe into the flue

1

3

4

2

5

Test gas connector

Blanking plug


9

4.1 Conduit, Cable and Gland Specifications

4 ELECTRICAL CONNECTIONS 4 ELECTRICAL CONNECTIONS…

Caution.

• Installation and repair must only be carried out by the manufacturer, authorized agents or persons conversant with theconstruction standards for hazardous area certified equipment. The specifications described in Table 4.1 are for systemelectrical requirements only . Only specifications shown may be used to conform to BS5345, EN50014 and EN50018.

• All cables must conform to BS5345 for flameproof 'd' type enclosures for mechanical construction.

Single Conduit – combined signal and power

19.68ft (6.0m) Signal/power conduit assembly fitted with M25 BASEEFA certified EEx d barrier glands each end(part no. EXFG/0060)

or32.81ft (10.0m) length Signal/power conduit assembly fitted with M25 BASEEFA certified EEx d barrier glands each

end (part no. EXFG/0061)

Dual Conduit – separate signal and power

19.68ft (6.0m) length Signal conduit assembly fitted with M25 BASEEFA certified EEx d barrier glands each end(part no. EXFG/0062)andpower conduit assembly fitted with M20 BASEEFA certified EEx d barrier glands each end(part no. EXFG/0063)

or32.81ft (10.0m) length Signal conduit assembly fitted with M25 BASEEFA certified EEx d barrier glands each end

(part no. EXFG/0064)andpower conduit assembly fitted with M20 BASEEFA certified EEx d barrier glands each end(part no. EXFG/0065)

Dual Cable – separate signal and power

Length to order Special signal cable, steel-wire armoured (part no. EXFG/0194) supplied with M25 BASEEFAcertified EEx d barrier glands for each end (part no. B11274 – M25/20 reducers, plus B1127520mm barrier glands)andspecial power cable, steel-wire armoured and screened, 3-core (part no. EXFG/0195) suppliedwith M20 BASEEFA certified EEx d barrier glands for each end (part no. B11275)

(maximum length 328.10ft (100.0m))

Table 4.1 Conduit/Cable and Gland Specifications – ZMT Oxygen Analyzer to EXFG Probe

Z-MT Oxygen Analyser

Single Conduit, Dual Conduit or Special Dual Cables

10

…4 ELECTRICAL CONNECTIONS

4.2.2 Single Conduit Probe Connections – Fig. 4.2

When making connections, ensure that the cables are routed correctly as shown in Fig. 4.2 (single conduit), Fig. 4.3 (dual conduit)or Fig. 4.4 (dual cable).

YELLOWGREEN/

GREY

GREY

YELLOWGREEN/

BLUE

BROWN

BLUE

WHITE

RED

HEATER

HEATER

EARTH

-VE

TRIP T/C +VETRIP T/CT/C -V

ECONTROLT/C +VECONTROL

CELL+VE

CELL-VE

SCREEN

Heater connections

Signal connections

Remove the terminalidentification cover

Remove the probehead cover

Remove the M6 x 20mmscrews retaining theprobe head cover (x8)

3

21

Fig. 4.2 Single Conduit Probe Connections

Blue

White

Blue

White

Red

Yellow

T/C -VE

T/C +VE

CELL +VE

CELL -VE

SCREENBlue

T/C -VE

T/C +VE

Control

Trip

Green/Yellow

Brown

Blue

Earth

Heater

Heater

EEx d blanking plug(BASEEFA certified)fitted by the Company

4.2 Conduit and Cable OptionsThe probe is available with one of three connection options –see Table 2.1 for code numbers. Options are:

a) Single conduit – 19.68ft (6.0m) or 32.81ft (10.0m) lengths,comprising; one conduit for signal and heater power leads,

b) Dual conduits – 19.68ft (6.0m) or 32.81ft (10.0m) lengths,comprising; one conduit for signal leads, one conduit forthe heater power lead,

c) Dual special cables – for lengths up to 328.10ft (100.0m),comprising; one special cable for signal leads, one specialcable for the heater power lead.

A 0.23in (6mm) external earthing point is fitted on the probehead base – see Fig. 3.1.

4.2.1 Access to Probe Terminals – Fig. 4.1

Warning . Once commissioned, the enclosure mustnot be opened when a flammable atmosphere is present. Fig. 4.1 Access to Probe Terminals

11

4 ELECTRICAL CONNECTIONS…

4.2.3 Dual Conduit Probe Connections – Fig. 4.3

BlueWhite

BlueWhite

Red

Yellow

T/C -VE

CELL +VECELL -VE

SCREENBlue

T/C -VE

T/C +VEControl

Trip

Green/Yellow

Brown

Blue

Earth

Heater

HeaterT/C +VE

Fig. 4.3 Dual Conduit Probe Connections

12

…4 ELECTRICAL CONNECTIONS

Fig. 4.4 Dual Cable Probe Connections

BlueWhiteBlueWhite

Red

T/C -VET/C +VE

CELL +VECELL -VE

ALL SCREENSBlack

T/C -VET/C +VE

Control

Trip

Green/YellowBrownBlue

EarthHeaterHeater

M20 Barrier glandand M25 reducer

M20 Barrier gland

1

1

2

2

3

3

Warning . When fitting barrierglands to special signal and power cableend, the gland manufacturer'sinstructions must be followed. Screensmust be isolated from the glandmetalwork when fitting the glands.

4.2.4 Dual Cable Probe Connections – Fig. 4.4

13

5 PIPE CONNECTIONS

Fig. 5.1 Air Connections

Reference Air Tubing

Vent Outlet Tubing

5.1 Pipe Connections – Fig. 5.1

The compression fittings on the back of the probe head have a1/4in olive as standard. Spare 6mm olives are also supplied inthe accessory kit as an alternative size – see Section 2.2.

5.1.1 External Reference Air Connection – Fig. 5.1

Warning . The maximum reference air pressure is 1.1bar absolute – certification may be invalidated if exceeded.

A clean, dry, oil-free regulated air supply is required at apressure between 20 and 100 millibars (8 to 40 in. W.G.), e.g.from a regulator unit (Model 003000241) available from theManufacturer. Connect the reference air tubing as shown inFig. 5.1. Refer to Table 5.1 for reference air and vent outlettubing specifications.

5.1.2 Vent Connection – Fig. 5.1

The vent outlet allows the reference air to escape toatmosphere via built in flame arrestors. If the outlet is likely tobe exposed to moisture, a suitable vent tube must beconnected to the outlet and routed to a dry area – see Fig. 4.5.Ensure that the vent outlet, or the vent tube, does not becomeblocked during probe use.

Tubing Tubing Specification

Reference Air Tubing 1/4in o.d. x1/8in i.d. stainlesssteel, nylon or p.v.c. tube(100°C ambient max.)

Vent Outlet Tubing 1/4in o.d. x1/8in i.d. stainlesssteel, nylon or p.v.c. tube(100°C ambient max.)

Table 5.1 Reference Air and Vent Tubing Specifications

Fig. 5.2 Resealing the Probe Head

5.2 Resealing the Probe Head – Fig. 5.2

Apply grease tothe flange(CG5317)

Ensure grease can be seenaround the entire flange thenremove any excess grease andcheck with a (0.2 mm) feelergauge that the gap between the lidand base is less than 0.2 mm

Fit the probe headcover

Insert M6 x 20mmsocket-head screwsand torque toapproximately3 ft-lbs (4Nm) usingan M5 Allen key

1

4

2

3

14

6 OPERATION 7 CALIBRATION

a) Check that a blanking plug is securely fitted to the test gasconnector on the probe – see Fig. 3.3.

Note. If the blanking plug is not fitted, air leakinginto the probe via the connector may causemeasurement errors. In a pressurized flue, gases ventingto atmosphere through the connector could causecorrosion of the test gas tube. In a negative pressure flue,air leakage may cause high O2 reading errors.

b) Check connections on both the Probe and the ZMTOxygen Analyzer (refer also to the ZMT Oxygen AnalyzerManual IM/ZMTEXFG Issue 1).

c) Switch on the mains power supply and reference air flow.

d) Check and, if necessary, adjust the reference air flow to astable flow rate between 50 and 1,000cc/min.

Full gas calibration procedures for the system are described inthe ZMT Oxygen Analyzer Manual IM/ZMTEXFG Issue 1.

Note . Test gas flows for all probes must be set to3,000cc/min. (±10%) or measurement errors may occur.

System fault finding procedures are given in Section 8. Wherea fault is traced to the probe, it may be possible to identify andrectify the fault.

After any rectification, the system must be re-calibrated asdescribed in the ZMT Oxygen Analyzer Manual IM/ZMTEXFGIssue 1, to maintain the stated accuracies.

7.1 Test Gas Connection – Fig. 7.1

A test gas inlet is provided for in situ probe testing using a test gas. Atest gas connector kit is supplied in the accessory kit – see Section2.2.1.

Fig. 7.1 Test Gas Inlet Connections

Remove the dust cap, attachthe test gas pipe and apply testgasses at 3000cc/min for 10minutes or remove the probefrom the duct and allow it tostabilize in normal atmosphere.

1

15

8 FAULT FINDING 8 FAULT FINDING…

Check for the correct voltage reading with respectto the ambient temperature – see Table 8.1

1

3

Measure the voltage across thecontrol thermocouple terminals

Measure the temperature at thecontrol thermocouple terminals

50°C

0°C

V

2

– VE

+VE

Fig. 8.1 Checking the Control Thermocouple

8.1 Checking the Zirconia Cell

Note. The zirconia cell can be tested withoutaffecting the explosion-proof integrity of either the EXFGProbe.

a) Carry out a system calibration check as described in theZMT Oxygen Analyzer Guide, IM/ZMTEXFG Issue 1.

If the analyzer response is correct when measuring test gasbut sluggish and insensitive when measuring flue gas, replacethe ceramic filter as described Section 8.1.

If a correct test gas response cannot be obtained, check thecontrol thermocouple operation as described in Section 8.1.1.

8.1.1 Checking the Control Thermocouple – Fig. 8.1

Warning. To check the control thermocoupleoperation it is necessary to remove the probe's connectioncover, thus invalidating the explosion proof integrity.Consequently, before removing the connection coverensure that their are no hazardous gases present or,alternatively, remove the probe from the hazardous area.

a) Remove the probe connection cover as described inSection 4.2.1.

Warning. The probe heater terminals are athigh voltage (55V a.c.). Take all necessary precautionsagainst electric shock when measuring voltages insidethe probe head.

b) Check the control thermocouple voltage as shown inFig. 8.1. The measured voltage must be within ±0.1mV ofthe voltages listed in Table 8.1.

If the measured voltage is correct , replace the zirconia cell asdescribed in Section 9.2.

If the measured voltage is high , relocate the probe to a position inthe flue where the temperature does not exceed 600°C.

If the measured voltage is low , check the heater operation asdescribed in section 8.1.2.

Ambient Thermocouple Ambient ThermocoupleTemp. (°C) mV Temp. (°C) mV

50 26.266 24 27.32849 26.307 23 27.36948 26.348 22 27.40947 26.389 21 27.45046 26.430 20 27.49045 26.471 19 27.53044 26.512 18 27.57043 26.554 17 27.61142 26.595 16 27.65141 26.636 15 27.69140 26.677 14 27.73139 26.718 13 27.77138 26.759 12 27.81137 26.799 11 27.85136 26.840 10 27.89135 26.881 9 27.93134 26.922 8 27.97133 26.963 7 28.01132 27.003 6 28.05031 27.044 5 28.09030 27.085 4 28.13029 27.126 3 28.16928 27.166 2 28.20927 27.207 1 28.24926 27.247 0 28.28825 27.288

Table 8.1 – Control Thermocouple v. AmbientTemperature (680 °C)

16

…8 FAULT FINDING

Measure the resistanceacross the heater leads

Disconnect the heaterleads from the terminalblock

The measuredresistance must be22Ω to 28Ω

Ω

3

1

2

Fig. 8.2 Checking the Heater Resistance

8.1.2 Checking the Heater Resistance – Fig. 8.2

Warning. To check the heater resistance it isnecessary to remove the probe's connection cover, thusinvalidating the explosion proof integrity. Consequently,before removing the connection cover ensure that theirare no hazardous gases present or, alternatively, removethe probe from the hazardous area.

a) Switch off the mains power supply to the InterfaceElectronics Unit.

b) Check the resistance of the probe heater as described inFig. 8.2.

If the heater resistance is correct , check the loop resistance ofthe heater circuit at the Interface Electronics Unit.

If the loop impedance is correct , replace the zirconia cell asdescribed in Section 9.2.

If the heater resistance is incorrect replace the heaterassembly as described in Section 9.5.

17

8 FAULT FINDING

Ambient Thermocouple Ambient ThermocoupleTemp. (°C) mV Temp. (°C) mV

50 21.815 24 22.87749 21.856 23 22.91848 21.897 22 22.95847 21.938 21 22.99946 21.979 20 23.03945 22.020 19 23.07944 22.061 18 23.11943 22.103 17 23.16042 22.144 16 23.20041 22.185 15 23.24040 22.226 14 23.28039 22.267 13 23.32038 22.308 12 23.36037 22.348 11 23.40036 22.389 10 23.44035 22.430 9 23.48034 22.471 8 23.52033 22.512 7 23.56032 22.552 6 23.59931 22.593 5 23.63930 22.634 4 23.67929 22.675 3 23.71828 22.715 2 23.75827 22.756 1 23.79826 22.796 0 23.83725 22.837

Table 8.2 – Trip Thermocouple v. AmbientTemperature (575 °C Minimum)

Fig. 8.3 Checking the Trip Thermocouple

Check for the correct voltage reading with respectto the ambient temperature – see Table 8.1

– VE

+VE

Disconnectthe tripthermocoupleleads

V

1

3

4

Measure the voltage acrossthe trip thermocouple terminals

Measure the temperature atthe trip thermocouple terminals

2

50°C

0°C

8.2 Checking the Trip Thermocouple – Fig. 8.3

Warning. To check operation of the tripthermocouple, the probe's connection cover must beremoved, thus invalidating the explosion proof integrity.Consequently, before removing the connection coverensure that their are no hazardous gases present or,alternatively, remove the probe from the hazardous area.

a) Remove the connection cover as described in Section4.2.1.

Warning. The probe heater terminals are athigh voltage (55V a.c.). Take all necessary precautionsagainst electric shock when measuring voltages insidethe probe head.

b) Check the trip thermocouple voltage as shown in Fig. 8.3.

Caution. The trip thermocouple voltage mustbe greater than or equal to the voltages listed in Table8.2, or the probe's certification is invalidated.

c) Ensure the measured voltage is correct .

d) If the measured voltage is incorrect , check the position ofthe trip thermocouple inside the heater then check the tripthermocouple voltage again. If the voltage is still incorrect,replace the trip thermocouple assembly as described inSection 9.6.

18

9 DISMANTLING AND RE-ASSEMBLY

Maintenance Procedure Tools Required

Replacing the Ceramic Filter

1 2

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen keySmall/medium hacksaw

Replacing the Zirconia Cell

1234

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen keySmall/medium hacksawScalpelM4 open-ended spanner

Replacing the Thermocouple/Electrode Lead Assembly

12345

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen keySmall/medium hacksawScalpelM4 open-ended spannerTwo slot-head screwdrivers, one small, one medium

Removing the Probe Body

12345

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen keySmall/medium hacksawScalpelM4 open-ended spannerTwo slot-head screwdrivers, one small, one medium

Replacing the Heater Assembly

1234567

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen keySmall/medium hacksawScalpelM4 open-ended spanners (x 2)Two slot-head screwdrivers, one small, one medium5.5mm Open-ended spannerLong nosed pliers (x 1 pair)

Replacing the Trip/Thermocouple Assembly

1234567

Torque driver 0 to 5Nm (with right-angle adaptor) fitted with an M3 hexagon wrench or M3 Allen key Small/medium hacksawScalpelM4 open-ended spanners (x 2)Two slot-head screwdrivers, one small, one medium5.5mm Open-ended spannerLong nosed pliers (x 1 pair)

Table 9.1 – Identification of Tools

Warning . Repairs and refurbishing of apparatus with type of protection 'd' should be performed only by the originalmanufacturer, authorized agents or a repairer who is conversant with the construction standards for flameproof equipmentand demonstrates the ability to understand certification restraints. (Extract from BS5345.)

Caution .

• The probe is a certified flameproof enclosure. Therefore, clearances and surface finishes between mating parts andlengths of spigot type joints MUST NOT be damaged during Dismantling and Re-assembly or any other maintenanceprocedures.

• If this condition is not observed, the certification of the equipment is invalidated. In the event of any damage to theequipment, refer to the Company.

• EEx d glands used on the Probe must be of the EEx d 'Barrier Gland' type with BASEEFA certification.

• All cables must conform to BS5345 for flameproof 'd' type enclosures for mechanical construction.

• Before removing the probe, thoroughly clean the outer surfaces with non-abrasive materials to prevent contamination ofthe inner assemblies.

• Only use replacement parts and components approved by the Company, this applies to nuts and bolts as well ascomponent parts. Never refit damaged items.

• We recommend that a special fasteners spares kit (see Section 10.4.5) is obtained prior to work on any of the dismantlingand re-assembly procedures described in this section.

Tools Required

19

Fig. 9.1 Replacing the Ceramic Filter

9 DISMANTLING AND RE-ASSEMBLY…

9.1 Replacing the Ceramic Filter – Fig. 9.1

A ceramic filter kit is required when replacing the ceramic filter – see Section 10.4.3.

9.1.1 Removing the Ceramic Filter – Fig. 9.1

Remove the ceramic filter as described in Fig. 9.1.

9.1.2 Fitting the Ceramic Filter – Fig. 9.1

Fit a replacement filter by reversing the procedure described in Fig. 9.1.

When refitting, insert a sufficient number of gaskets to allow the securing screws to hold the filter firmly in position.

Note. If screws have seized, refer to Fig. 9.15 on page 33 and cut at points A and B.

Caution. There must be at least two gaskets on the cell side of the filter and atleast one on the end plate side. The central hole in the filter gaskets is enlarged to allowfree flow of test gas past the gaskets. Ensure that the gaskets are positioned concentricwith the filter to prevent any test gas flow restriction. Torque the screws evenly to3ft-lbs (4Nm). Do not overtighten.

Cell Mount

Remove the M4 x 10mmsocket-head screws (x 3)

Remove the filter endplate and the gaskets

Remove and discardthe ceramic filter

Remove the gaskets betweenthe filter and the test gas plate

Filter Spacer

M4 x 40mm filterspacer socket-headscrews (x 3)

1

3

2

M4 x 30mm EEx d test gas platesocket-head screws (x 6)

4

20

…9 DISMANTLING AND RE-ASSEMBLY

9.2 Replacing the Zirconia Cell

A zirconia cell assembly is required when replacing thezirconia cell – see Section 10.4.2.

Fig. 9.2 Removing the Zirconia Cell

9.2.1 Removing the Zirconia Cell – Fig. 9.2

a) Remove the ceramic filter as described in Section 9.1.1.

b) Remove the zirconia cell as described in Fig. 9.2.

Caution . During prolonged service the celltip may become welded to the helical contact on theend of the thermocouple/electrode lead assemblyand thus prevent removal of the cell. If resistance isfelt when removing the cell mount, once all of thespring movement is taken up, do not try to forceremoval or the inner electrode may be damaged.

Note. If screws have seized, refer to Fig.9.15 on page 33 and cut at points B and C.

Gently ease the cell assembly out of theprobe body until approximately 0.39in(10mm) of the ceramic assembly is visible

0.08 to 0.12in(2 to 3mm) max.

Carefully separate the cell tipfrom the helical contact usinga scapel

3

Thermocouple/Electrodelead assembly

4

Disconnect the thermocouple/electrodesignal leads and straighten them out toallow easy withdrawal of the leadassembly – see Fig. 9.6

1

Test gas plate

Probe body

'O' Ring

Remove the M4 x 40mm filterspacer screws (x 3), the M4 x 30mmtest gas plate retaining screws (x 3),the filter spacers (x 3) and the test gas plate

Cell assembly

2

Red

White

Blue

21


Fig. 9.3 Fitting the Zirconia Cell

9.2.2 Fitting the Zirconia Cell – Fig. 9.3

a) Carry out the procedures described in Fig. 9.3.

b) Refit the ceramic filter as described in Section 9.1.2.

Caution. Torque the filter spacer screws (M4 x40mm) and the test gas plate retaining screws (M4 x30mm) to 3ft-lbs (4Nm). Do not overtighten.

Examine the contact on theinner electrode insulator –the connection should appearas a flat helix supportedcentrally on the insulatorCheck that the

thermocouple beadtouches the end of

the cut-out

Align the test gasplate inlet holes and…

…gently ease the cellassembly into the probe body

Insert the M4 x 40mmfilter spacer screws(x 3) to maintain correctcell orientation

Fit the clamp ring, ensuringcorrect orientation, and secureusing the M4 x 30mm test gasplate retaining screws (x 3)

1

3

5

2

M4 x 30mm testgas plateretainingscrews (x 6)

4

0.08 to 0.12in(2 to 3mm) max.

3

Reconnect thethermocouple/electrodesignal leads

Red

White

Blue

6

22


9.3 Replacing theThermocouple/Electrode Lead Assembly

An electrode/thermocouple assembly is required whenreplacing the electrode/thermocouple lead assembly – seeSection 10.4.1

9.3.1 Removing the Thermocouple/Electrode LeadAssembly – Fig. 9.4


b) Remove the zirconia cell as described in Section 9.2.1.

c) Remove the thermocouple/electrode lead assembly asdescribed in Fig. 9.4.

Fig. 9.4 Removing the Thermocouple/Electrode Lead Assembly

Withdraw the thermocouple/electrodelead assembly

Remove thesprings

Remove thepusher plate

Cut through the electrode wires…

… and remove and retain theceramic insulator(s) from the wire (discard theold thermocouple/electrode lead assembly)

Remove the 2 screwsa n d s h a k e p r o o fwashers retaining thepusher plate

Pusher plate

Disconnect thereference air pipe1

2

6

7

5

4

3

23


Fig. 9.5 Fitting Ceramic Insulators

Note . Ensure that wires between the ceramic insulators donot cross and that the ceramic insulators butt together correctly atthe joints.

Caution. Do not attempt to thread more than half theceramic insulator length onto a wire at any one time.

Information . Use a magnet to check that the insulators andPTFE sleeves have been threaded onto the correct wires; thethermocouple –ve lead should be attracted by the magnet andsleeved blue.

11in (280mm)

Thread the ceramic insulator(s) onto the extensionwires one at a time. Ensure that each wire is locatedin the correct bore.

Slide 11in (280mm) of PTFE sleevingonto the wire ends then pass sleevinginto the ceramic insulator until 7.87in(200mm) protrudes. Ensure that thecorrect color sleeving is used.

Blue(Thermocouple –ve,

magnetic)Red

(Electrode)

White(Thermocouple +ve)

Cut the wires to length leavingapproximately 0.40in (10mm)bare. Bend approximately 0.20in(5mm) of lead end over to retainthe PTFE sleeves on the wires.

Clamping Block

1

0.40in(10mm)

0.20in(5mm)

3

2

9.3.2 Fitting Ceramic Insulators – Fig. 9.5

a) Lay the new thermocouple/electrode lead assembly at the end of a long work surface and carefully uncoil the extension wires,one at a time.

Note . To retain the uncoiled lead ends during fitting, use a clamping block constructed from a wooden board and threebulldog clips – see Fig. 9.5.

Caution. Do not to kink the wires during fitting to avoid damage to the finished assembly.

b) Refit the ceramic insulators as described in Fig. 9.5.

c) Refit the zirconia cell as described in Section 9.2.2.

d) Refit the ceramic filter as described in Section 9.1.2.

24


9.3.3 Fitting the Thermocouple/Electrode Lead Assembly – Fig. 9.6

a) Refit the thermocouple/electrode lead assembly as described in Fig. 9.6.

b) Refit the zirconia cell as described in Section 9.2.2.

c) Refit the ceramic filter as described in Section 9.1.2.

Fig. 9.6 Fitting the Thermocouple/Electrode Assembly

2in(50mm)

Insert the PVC feed tube (supplied with leadassembly kit) through the probe body untilapproximately 2in (50mm) protrudes fromend of body

Slide the three extension leadsinto one end of the feed tube

Slide the thermocouple/electrode lead assemblythrough the probe until thePVC feed tube appearsat the head cover end ofthe probe

2

1

Remove the PVC feed tubefrom the extension wires

Refit the springsover the PVCfeed tube

…… refit the pusher plate assemblyby reversing the procedure detailedin Section 9.3.1

Re-connect the extensionwires to the terminal block

White (+ve)

Blue (–ve)

4

5

7

Feed the extension wires throughthe tube on the pusher plate and……

6

3

Red (+ve)

25


9.4 Removing the Probe Body – Fig. 9.7

A special fasteners kit is required when refitting the probe body– see Section 10.4.5.

Fig. 9.7 Removing the Probe Body



c) Remove the probe body described in Fig. 9.7.

Note. If screws have seized refer to Fig. 9.15, page 33 and cut at point C.

Remove the M4 x 16mmsocket-head screws (x 6)

Slide the probe body off(keep the test gas tubein position)

Retain the O-rings(x 2) for re-assembly– replace if damaged

2

Test gas tube

1

3

26

9.5 Replacing the Heater Assembly

A new heater assembly is required when replacing the heaterassembly – see Section 10.4.4.


9.5.1 Removing the Heater Assembly – Fig. 9.8

a) Remove the ceramic filter as described in Section 9.1.1


c) Remove the probe body described in Section 9.4.

d) Remove the heater assembly as described in Fig. 9.8.

Fig. 9.8 Removing the Heater Assembly

Caution. Do not damage the insulator or stress the heater wires whenremoving the heater body.

Slide the heater bodyaway from theprobe assembly

2

Insulator

Use two M4 spanners todisconnect the heater leads

1

27


9.5.2 Fitting the Heater Assembly – Fig. 9.9

a) Refit the heater assembly as described in Fig. 9.9

b) Align the heater assembly as described in Fig. 9.10.

Fig. 9.9 Fitting the Heater Assembly

1

Caution . When re-connecting the heater,ensure the heater wires do not touch the innerelectrodes or the probe body.

1

2

1

Reconnect the heaterleads and secure theretaining nuts

Slide the heater into position,ensuring the three heater supportrods pass through the three locationholes in the heater endplate

Straighten theheater leads

Safety trip thermocouple

3

Caution. Take care not disturb the safety trip thermocouple during re-assembly.

2

2

28


Fig. 9.10 Aligning the Heater Assembly – Preparation

9.5.3 Aligning the Heater Assembly – Figs. 9.10, 9.11 and 9.12

a) Align the heater assembly as described Figs. 9.10, 9.11 and 9.12.

b) Refit the probe body by reversing the steps described in Fig. 9.7.

c) Refit the zirconia cell as described in Section 9.2.2.

d) Refit the ceramic filter as described in Section 9.1.2.

0.15in(4mm)

1

3

2

Unscrew the three heatersupport rod locknuts by0.15in (4mm)

Heater mounting plate

Heater support rod

Screw in each heatersupport rod (x 3)by 0.15in (4mm)

Ensure the heater body is located on the heatermounting plate and the three heater support rodsappear through the heater end plate

29


Fig. 9.11 Aligning the Heater Assembly – Checking Heater Alignment

…9.5.3 Aligning the Heater Assembly

Caution. Do not force the heater into the probe shoulder byovertightening the heater support rods.

Screw the heater support rods (x 3)anti-clockwise until the top of the heatermeets the internal shoulder of the probe body

Refit the probe body (including the O-ring)and temporarily secure the body in position fittingthe M4 x 16mm screws (x 2) in opposing holes

Check for an even fit, ensure no gapis visible between the heater and theinternal shoulder in probe

3

2

1

Internal shoulder

30


Fig. 9.12 Aligning the Heater Assembly – Locking Heater into Position

Caution. When tighteningthe locknuts, ensure that heatersupport rods do not move and causemisalignment of the heater.

Tighten the heater support rodlocknuts to secure the heater inposition

1 Screw the heater support rods (x 3) 2 turnsclockwise to release pressure on the heater

Unscrew the the M4 x 16mmscrews (x 2) and remove theprobe body

2

3

…9.5.3 Aligning the Heater Assembly

Caution . After refitting the heater, check the trip thermocouple voltage (see Section 8.2), or the probe's certificationis invalidated.

31


9.6 Replacing the Trip Thermocouple Assembly

A replacement trip thermocouple assembly is required for this procedure – see Section 10, Fig. 10.1b, item 35.

9.6.1 Removing the Trip Thermocouple Assembly – Fig. 9.13



c) Remove the probe body described in Section. 9.4.

d) Disconnect the thermocouple/electrode lead assembly as described in Section 9.3.1.

e) Disconnect the trip thermocouple leads in the terminal head – see Section 4.

f) Remove the trip thermocouple assembly as described in Fig. 9.13.

Fig. 9.13 Removing the Trip Thermocouple Assembly

Remove the existing trip thermocouplefrom the probe internal assembly bygently bending and easing it out of theslot in the flange

Loosen the three filter spacersby unscrewing each spacer

evenly, 2 turns at a time

Carefully withdraw the columninsulators from the column probe taking

care not to damage the ceramic tubes

Slot

Disconnect the tripthermocouple leads1

White

Blue

2

3

4

Caution. When withdrawing the trip thermocouple, do not apply stress on supporting components.

32


9.6.2 Fitting the Trip Thermocouple Assembly – Fig. 9.14

a) Re-assemble the trip thermocouple assembly as described Fig. 9.14.

b) Re-connect the trip thermocouple leads in the terminal head – see Section 4.

c) Refit the thermocouple/electrode lead assembly as described in Sections 9.3.2 and 9.3.3.

d) Refit the probe body by reversing the steps described in Section 9.4.

e) Refit the zirconia cell as described in Section 9.2.2.

f) Refit the ceramic filter as described in Section 9.1.2.

g) When the probe is fully assembled:

i) Switch on the ZMT Oxygen Analyzer .

ii) When heater operating temperature is reached (after approximately 15 minutes) leave for a further 1 hour tostabilize.

iii) Check the trip thermocouple voltage as described in Section 8.2.

Caution . The trip thermocouple voltage must be within the limits stated in Section 8.2, or the probe's certificationis invalidated.

Fig. 9.14 Fitting the Trip Thermocouple Assembly

1

3

2

Evenly tighten the three filter spacers,2 turns at a time, until secure

Refit the trip thermocouple into the heater body bygently bending and easing it into place

Carefully refit the column insulatorsinto the probe column takingcare not to damage the ceramic tubes

Caution.

• When refitting the trip thermocouple, do not stress supporting or adjacentcomponents.

• The trip thermocouple must be positioned accurately inside the heaterelement to ensure accurate voltage readings when checking the tripthermocouple voltage – see Section 9.6.2, step g).

33


9.7 Removing Seized Screws – Fig. 9.15

During prolonged service in a high temperature screws may become seized. Seized screws must be cut (using a suitable hacksaw)and removed to allow sub-assemblies to be dismantled or removed.

Authorized replacement screws (for all external fastenings) can be obtained by ordering a special fasteners spares kit– see Section 10.4.5.

Fig. 9.15 Cutting and Removing Seized Screws

Warning.• Only cut seized screws at the cutting points identified below.

• Only fit new screws supplied by the Company – see Section 10.4.5.

• During cutting, take care not to cut or damage adjacent parts.

D

A

C

B

34

10 REPLACEMENT PARTS

Fig

. 10.

1a Id

entif

icat

ion

of P

arts

19

18

16

15

20

22

23

89

10

109

8

1213

65

25

4

3

1

24

6

21

7

11

14

17

2

10.1 Illustrated Parts List – Fig. 10.1a and 10.1b

35

10 REPLACEMENT PARTS…

* Ite

ms

not i

llust

rate

d

Item

Des

crip

tion

Par

t No.

Qty

.

1E

Ex

d co

lum

n fla

nge

......

......

......

......

..E

XF

G/0

131I

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2C

olum

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......

......

......

......

.....

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FG

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1...

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3M

4 x

10m

m s

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t-he

ad s

crew

......

...B

9760

......

......

......

.7

4C

olum

n as

sem

bly

1.64

ft (0

.5m

) P

robe

bod

yS

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ard

......

......

......

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XF

G/0

070I

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gle

cond

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ptio

n on

ly)

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36

Fig. 10.1b Identification of Parts

…10

RE

PLA

CE

ME

NT

PA

RT

S

48

3334

32

31

27

28

29

30

26

29

3

5857

56

55

54

53

47

5150

49

37

4039

36

38

4243

44

38

29

4138

41

45

46

47

55

6035

52

…10.1

Illustrated Parts List – F

igs. 10.1a and 10.1b

37

10 REPLACEMENT PARTS…

Item

Des

crip

tion

......

......

......

......

......

......

...P

art N

o....

......

......

Qty

.

38M

4 pl

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38

10 REPLACEMENT PARTS

10.2 Mounting Plate

Mounting plate assembly – see Fig. 2.4 ............ 003000354

10.3 Conduit Assemblies and Special Dual Cable

10.3.1 Single Conduit Assembly(combined power/signal)

Standard 19.68ft (6m) assembly ........................ EXFG/0060M20 EEx d bung .................................................... B11116

Standard 32.81ft (10 m) ..................................... EXFG/0061M20 EEx d bung .................................................... B11116

10.3.2 Dual Conduit Assembly(separate power/signal)

Standard 19.68ft (6m) assembly, comprising:signal conduit (inc. 2 x M25 EEx d glands) .. EXFG/0062andpower conduit (inc. 2 x M20 EEx d glands) .. EXFG/0063

Standard 32.81ft (10m) assembly, comprising:

signal conduit (inc. 2 x M25 EEx d glands) .. EXFG/0064andpower conduit (inc. 2 x M20 EEx d glands) .. EXFG/0065

10.3.3 Special Dual Cable(separate power and signal cable)

Cable up to 328.10ft (100m):signal cable (per meter) ............................... EXFG/0194

M20 EEx d glands (x 2) ................................. B11275M25/M20 reducer (x 2) .................................. B11274

power cable (per meter) ............................... EXFG/0195M20 EEx d glands (x 2) ................................. B11275

10.4 Spares Kits and Replacement Items

10.4.1 Electrode/Thermocouple Lead Assembly

Thermocouple/Electrode lead assembly kit ...... EXFG/0086

Comprising:Electrode/thermocouple sub-assembly ....... EXFG/0085Spring (x 2) .......................................................... B11186Heater sleeve, length 0.98ft (0.3m) ...................... B4204Insulation sleeve – blue,length 0.82ft (0.25m) ..................................... 002410034Insulation sleeve – white,length 0.82ft (0.25m) ..................................... 002410033Insulation sleeve – red,length 0.82ft (0.25m) ..................................... 002410032PVC feed tube,length 1.64ft (0.5m) ......................................... YBM0202

10.4.2 Zirconia Cell

Zirconia cell assembly ....................................... EXFG/0088

10.4.3 Ceramic Filter

Ceramic filter kit ................................................. EXFG/0087

Comprising:Ceramic filter ................................................ EXFG/0136Filter gaskets (x 7) ........................................ 003000094

10.4.4 Heater

Heater assembly ................................................ EXFG/0096

10.4.5 Fasteners

Special fasteners spares kit .............................. EXFG/0083

Comprising:M4 x 10mm socket-head screw (x 7) .................... B9760M4 x 16mm socket-head screw (x 6) .................... B7295M4 x 30mm socket-head screw (x 6) .................. B10714M4 x 40mm socket-head screw (x 3) .................. B10709M6 x 20mm socket-head screw (x 8) ................... B11115

10.5 Sealants

Grease 0.88lb (400gm) tube (probe head flange) .. CG5317

Thread sealant (vent connections). ......................... CG5091

10.6 Accessory Kits

Accessory kit – see Fig. 2.2. ............................. EXFG/0067

39

APPENDIX

Fig. A1 Displayed Value (mV) v. Percentage Oxygen

A1 Displayed Value (mV) v. Percentage Oxygen – Fig. A1

Dis

play

ed V

alue

(m

V)

Oxygen (Volume) %

0.1 0.5 1 2 5 10 20 25

-3.7-6

-3.7

0

10

20

30

40

50

60

70

80

90

0.20

100

110

40

NOTES

PRODUCTS & CUSTOMER SUPPORT

A Comprehensive Instrumentation Range

Analytical Instrumentation• Transmitters

On-line pH, conductivity, and dissolved oxygentransmitters and associated sensing systems.

• SensorspH, redox, selective ion, conductivity and dissolvedoxygen.

• Laboratory InstrumentationpH and dissolved oxygen meters and associatedsensors.

• Water AnalyzersFor water quality monitoring in environmental, powergeneration and general industrial applications including:pH, conductivity, ammonia, nitrate, phosphate, silica,sodium, chloride, fluoride, dissolved oxygen andhydrazine.

• Gas AnalyzersZirconia, katharometers, hydrogen purity and purge-gasmonitors, thermal conductivity.

Controllers & Recorders• Controllers

Digital display, electronic, pneumatic. Discrete single-loop and multi-loop controllers which can be linked to acommon display station, process computer or personalcomputer.

• RecordersCircular and strip-chart types (single and multi-point) fortemperature, pressure, flow and many other processmeasurements.

Electronic Transmitters• Smart & Analog Transmitters

For draft, differential, gauge and absolute pressuremeasurement. Also, liquid level and temperature

• I to P Converters and Field Indicators

Flow Metering• Magnetic Flowmeters

Electromagnetic, insertion type probes and water meters.

• Turbine Flowmeters

• Wedge Flow Elements

• Mass Flow MetersTransmitters, sensors, controllers and batch/displayunits.

Level Control• Submersible, Capacitance & Conductivity.

Pneumatic Instrumentation• Transmitters

• Indicating Controllers

• Recording Controllers

Customer Support

ABB Kent-Taylor provides a comprehensive after salesservice via a Worldwide Service Organization. Contact one ofthe following offices for details on your nearest Service andRepair Centre.

United KingdomABB Kent-Taylor LimitedTel: +44 (0)1480 470781Fax: +44 (0)1480 470787

United States of AmericaABB Instrumentation Inc.Tel: +1 716 2926050Fax: +1 716 2736207

ItalyABB Kent-Taylor SpATel: +39 (0) 344 58111Fax: +39 (0) 344 56278

Client Warranty

Prior to installation, the equipment referred to in this manualmust be stored in a clean, dry environment, in accordance withthe Company's published specification. Periodic checks must bemade on the equipment's condition.

In the event of a failure under warranty, the followingdocumentation must be provided as substantiation:

1. A listing evidencing process operation and alarm logs at timeof failure.

2. Copies of operating and maintenance records relating to thealleged faulty unit.

The Company's policy is one of continuous productimprovement and the right is reserved to modify theinformation contained herein without notice.

© 1996 ABB Kent-Taylor Printed in the EC 12.96

ABB Kent-Taylor Ltd.St. Neots,Cambs.England, PE19 3EUTel: (01480) 475321Fax: (01480) 217948

IM/E

XF

G-P

BZ

Issu

e A

ABB Kent-Taylor Ltd.Analytical & Flow GroupStonehouse, Glos.England, GL10 3TATel: (01453) 826661Fax: (01453) 826358

ABB Instrumentation Inc.PO Box 20550, RochesterNew York 14602-0550USATel: (716) 292 6050Fax: (716) 273 6207

ABB Kent-Taylor SpA22016 LennoComoItalyTel: (0344) 58111Fax: (0344) 56278

ABB KENT-TAYLOR · ABB Kent-Taylor is an established world force in the design and manufacture of ... 8.1 Checking the Zirconia Cell ... Fault Finding Z-MT Oxygen Analyser

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