Some Typical applications include: Sulphur Hexafluoride Used in Circuit Breakers Sulphur hexafluoride is used as an insulating gas in circuit breakers. Excess moisture in SF6 gas causes arcing, which can trip the circuit breaker and cut off power to the distribution network. Moisture in Natural Gas The presence of moisture in high-pressure natural gas from a producing well causes pipelines and associated valves to freeze. High moisture content also leads to the formation of hydrates of the liquid hydrocarbons present, thus causing further difficulties. The moisture content of the gas also adversely affects the BTU value of the gas, thus lowering the quality and value of the product. Vacuum-Evacuation and Gas Refill in Oil Filled Transformers Moisture is continuously monitored in the vacuum evacuation and gas refill of oil-filled transformers. The moisture content of blanketing gases, of oil-filled transformers, directly affects the dielectric properties of the oil through water vapour dissolution. Instrument Air The presence of moisture in air used as a blanketing gas for sensitive instruments can cause corrosion problems, rapid changes in calibration, and loss of instrument sensitivity. Breathing Air The presence of excess moisture in breathing air can lead to freezing in the pressure regulator and ice blocking the orifice, causing an interruption to the supply of air to the user. Hydrogen Annealing Ovens High moisture content in hydrogen gas used in annealing furnaces causes oxidation of the metal to occur, thus resulting in an undesirable surface finish on the product. Ethylene Gas Stream for High-Density Polyethylene Production High moisture content in the Ethylene feed gas reduces the catalyst activity, thereby decreasing the overall yield of the polyethylene reactors. Hydrogen Cooled Electric Generators Hydrogen is used to cool large stationary generators because of its high heat capacity and low viscosity. The hydrogen must be kept dry in order to maintain both its heat capacity and viscosity properties. Ambient moisture is considered a contaminant which will reduce the heat capacity and increase the viscosity of the cooling hydrogen. Injection Moulding The presence of excess moisture in the air used to dry plastic pellets has several adverse effects on the plastic products which are produced. 1. Excess moisture decreases the strength of the product. 2. Excess moisture causes a poor finish on the surface of the product. 3. Excess moisture causes clear plastic products to have a cloudy appearance. All of these production defects reduce product yield and escalate production costs. Nuclear Reactors The Advance Gas Cooled Reactor uses carbon dioxide gas to transfer heat from the nuclear fission core to the water boiler for steam generation. The moisture content needs to be kept low to avoid corrosion damage, and the moisture monitoring will also act as a leak detector. Packaging Foods For some foil-wrapped foods such as butter, it is possible to extend the storage life if the small amount of air trapped within the foil is replaced with nitrogen with a very low moisture content. Dew Point Measurement
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Some Typical applications include:
Sulphur Hexafluoride Used in Circuit BreakersSulphur hexafluoride is used as an insulating gas in circuit breakers. Excess moisture in SF6 gas causes arcing, which can trip the circuit breaker and cut off power to the distribution network.
Moisture in Natural GasThe presence of moisture in high-pressure natural gas from a producing well causes pipelines and associated valves to freeze. High moisture content also leads to the formation of hydrates of the liquid hydrocarbons present, thus causing further difficulties. The moisture content of the gas also adversely affects the BTU value of the gas, thus lowering the quality and value of the product.
Vacuum-Evacuation and Gas Refill in Oil Filled TransformersMoisture is continuously monitored in the vacuum evacuation and gas refill of oil-filled transformers. The moisture content of blanketing gases, of oil-filled transformers, directly affects the dielectric properties of the oil through water vapour dissolution.
Instrument AirThe presence of moisture in air used as a blanketing gas for sensitive instruments can cause corrosion problems, rapid changes in calibration, and loss of instrument sensitivity.
Breathing AirThe presence of excess moisture in breathing air can lead to freezing in the pressure regulator and ice blocking the orifice, causing an interruption to the supply of air to the user.
Hydrogen Annealing OvensHigh moisture content in hydrogen gas used in annealing furnaces causes oxidation of the metal to occur, thus resulting in an undesirable surface finish on the product.
Ethylene Gas Stream for High-Density Polyethylene ProductionHigh moisture content in the Ethylene feed gas reduces the catalyst activity, thereby decreasing the overall yield of the polyethylene reactors.
Hydrogen Cooled Electric GeneratorsHydrogen is used to cool large stationary generators because of its high heat capacity and low viscosity. The hydrogen must be kept dry in order to maintain both its heat capacity and viscosity properties. Ambient moisture is considered a contaminant which will reduce the heat capacity and increase the viscosity of the cooling hydrogen.
Injection MouldingThe presence of excess moisture in the air used to dry plastic pellets has several adverse effects on the plastic products which are produced.
1. Excess moisture decreases the strength of the product.2. Excess moisture causes a poor finish on the surface of the product.3. Excess moisture causes clear plastic products to have a cloudy appearance.
All of these production defects reduce product yield and escalate production costs.
Nuclear ReactorsThe Advance Gas Cooled Reactor uses carbon dioxide gas to transfer heat from the nuclear fission core to the water boiler for steam generation. The moisture content needs to be kept low to avoid corrosion damage, and the moisture monitoring will also act as a leak detector.
Packaging FoodsFor some foil-wrapped foods such as butter, it is possible to extend the storage life if the small amount of air trapped within the foil is replaced with nitrogen with a very low moisture content.
• Self monitoring of instrument funcion. • All changes and seings are saved on
several levels (user and administrator) with password protecion.
• The analogue output can be scaled freely.
APPLICATIONS• Producers and users of technical and
medical gases• Microelectronics• Chemical industries (especially for
technologies with aggressive gases)
• Mechanical and apparatus engineering• Heat treatment / hardening processes• Research and laboratories
For more informaion on the Model EDM-W and EDM-R Call +44 (0) 1274 733100or Email: [email protected]
NEW
The Model EDM-W and EDM-R Trace Moisture Analysers arethe next generaion of successful measuring instruments thatwork on a basis of P2 O5 sensors and are used for the determinaion of moisture in most gases (excluding NH3ammonia) in the ppm range.
They consist of a separately installed measuring cell mainly of PVDF (for aggressive gases), that can be integrated in a Gas Handling System, and an electronic evaluaion unit.
Colour Touch Screen - Rugged - Accurate - Easy Set Up - 1 or 4 Channels.
P2 O5 sensor
WallMounted
Rack Mounted
Gas Collection and Transfer Unit for SF6 and other non-aggressive gases
Model GCTU-B (Battery/Cell powered)
FEATURES
• Fully portable – re-chargeable batteries
• 7 fill/discharge cycles on single battery
charge
• 12 bar maximum back fill pressure
• Rugged IP67 transport case
• User friendly operation with built-in fail safe
features
• Supplied ready for use with connectors and
high quality pipes and hoses
• Can also be connected to purity analysers
The Alpha Moisture Systems GCTU-B has been specifically
developed to collect all SF6 sampled for analysis. The Model
GCTU-B is also designed to recycle the entire SF6 sample to the high
or medium voltage switch(GIS)/transformer giving a zero effect to
the installation and protecting the environment by eliminating any
discharge to the atmosphere.
The common usage of SF6 in high and medium voltage switchgear
and transformers has brought significant advantages in
performance and reliability but, because SF6 is a “greenhouse
gas”, special precautions must be adopted when routine
sample analysis is undertaken.
1. Connect & Set up
2. Collect SF6
3. Take sample
4. Transfer back
Completion of spot
check analysis in
under 10mins*
The NEW GCTU-B can be utilised with any field analysis instruments and because it is battery/cell
operated and fully portable this provides a simple and effective method of achieving an environmentally
friendly solution to SF6 analysis and recycling.
Model GCTU-B is fully compatible with all Alpha Moisture Systems portable dewpoint hygrometers
including Model SADPMini, Model SADPmini-Ex, Model SADPμ, Model SADPMini, Model P35,
Model P35 is a fully self-contained portable hygrometerfrom Alpha Moisture Systems, designed specifically for useduring the assembly, commissioning and service of SF6gas insulated switchgear, though its features make it idealfor many other on-site applications.
Designed with the operator in mind, Model P35 isextremely easy to use and the microprocessor technologyenables accurate and reliable readings over long periods oftime, ensuring the most dependable moisturemeasurement in both industrial and laboratory applications.
The incorporation of the Desiccant Dry-down Chamber,together with stainless steel quick connect fittings andadditional components for sample flow control andindication, means that the user can be assured that anaccurate reading will be made using a minimal amount ofvaluable SF6 gas.
Designed to measure at atmospheric pressure, Model P35encompasses an overall range from -80°C to 0°Cdewpoint. Precise factory calibration ensures guaranteedaccuracy and reliability of operation. The instrument canbe operated from a switchable mains supply of 100/120V or200/240V AC, or using self contained internal batteries.
Model P35 is supplied ready for use with batteries installed,calibration certificate traceable to National and
International Humidity standards, two metres of stainlesssteel braided PTFE sampling hose and instruction manual.
To allow rapid spot checks it is essential that the measuringsensor is kept drier than the sample to be measured. Thedesiccant dry-down chamber is designed to do just this bykeeping the sensor surrounded by desiccant when theinstrument is not in use, only exposing it to the sample gaswhen taking measurements. At no stage is the sensor allowedto come into contact with ambient air.
ReadPosition
samplegas inlet
sensor exposedto gas sample
sampleexhaust
Desiccant Head assemblyfigure 1
Dry-DownPosition
Sensor surroundedby desiccant
sensor
Features :-• Overall Range - 80°C to 0°C Dewpoint (-112°F
to +32°F)• Guaranteed Accuracy ± 2°C Dewpoint• User Friendly - Simple Operation• Portable - Fully Self Contained• Digital Indication in °C or °F • Automatic Calibration• Sample Flow Indication• Quick Connect SS Fittings • Battery or Mains Operated• Supplied With Calibration Certificate • Sample Flow Control for Inlet Pressure up to
20 barg• Desiccant Dry-Down Chamber For Rapid
Measurements
FEATURES
• User Friendly & Advanced Functionality
• Factory set in either °C or °F Dewpoint,
ppm(v), ppb(v), g/m3 or lbs/MMSCF
• 22V – 253V AC or DC Operation
• Linear 4-20mA Retransmission Signal
• 2 Independent, Fully Programmable
Alarm Relays
• “AUTOCAL” CALIBRATION FEATURE
• Fast Response
• Long Term Stability
• IP66 / NEMA4 Weatherproof Protection
• Calibration traceable to National &
International Standards
Fast Response - Stable - Reliable -
Accurate - Easy to Install.
User friendly solution for continuous on-line dewpoint
measurement in dry process gases and dry compressed
air, offering powerful functionality and simple interface
through advanced digital technology.
Model DS1200 from Alpha Moisture Systems is a single channel
on-line hygrometer designed to measure dewpoint in process
gases and dry compressed air. The panel mounted ⅛ DIN
dewpoint meter, providing panel protection to IP65 (NEMA4X),
combines with the Model AMT range of ultra high capacitance
sensors for accurate trace moisture measurement.
Combination of advanced digital technology of the display electronics and the transmitter, makes this the
system of choice for a wide range of applications where precise indication, control and monitoring is critical.
Model DS1200-AMT system can be factory configured to read in °C dewpoint, °F dewpoint, ppm(v), ppb(v),
g/m³ or lbs/MMSCF. The measured value is displayed on a large 4 digit, 13.8mm high, fourteen segment
LED display. Model DS1200-AMT Dewpoint Hygrometer is fully configured to the customer's specifications.
The instrument offers two fully programmable alarm relays, which can be independently set across the
full operating range. An optically isolated analogue signal, linear with the measured unit is also available
(to interface with any external device).
Model DS1200-AMT can be supplied with any one of a range of dewpoint transmitters, which have all
been specially manufactured to provide long term stability, so ensuring a long and trouble free service life.
The long lasting sensing element offers excellent sensitivity, repeatability and response speed - especially
on dry down. Integrated electronics in each transmitter allow calibration data to be stored within its
memory, making transmitters completely field interchangeable.
Each transmitter is calibrated to provide overall system accuracy of better than ±2°C dewpoint and
supplied with a certificate traceable to international humidity standards.
Model DS1200-AMT also incorporates the invaluable “AUTOCAL” feature for easy field verification of the
system response, without recourse to any additional equipment. Accidental or unauthorised operation is
prevented by a simple initiation routine.
The system allows the display unit to be sited in excess of 1000m from the transmitter, connected by a
simple twisted pair cable.
Single Channel Dew Point Hygrometer
Ranges available between -1200C to +200C (-1660F to +680F) dewpoint
• Can be configured for Linear 4-20mA signal in: ºC & ºF Dewpoint, ppm(v), g/m
3, lb/MMSCF
• Temperature Compensation
• Failure Diagnostics
• Long Term Stability
• Fast Response
• IP66 / NEMA4X Protection
Model AMT-Ex Dewpoint Hygrometer is a three wire 4-20mA transmitter, used for continuous measurement of humidity
in a process gas or compressed air, which will output a linear 4-20mA signal corresponding to the dewpoint temperature. The Model AMT-Ex transmitter can also be factory configured to output a 4-20mA linear signal for any other moisture unit e.g. ppm(v), ppm(w), g/m
3, lb/MMSCF etc.
The long lasting sensing element offers excellent sensitivity, repeatability and response speed. Each unit is supplied with a Certificate of Calibration, traceable to International Humidity Standards, validating accuracy to ±2ºC dewpoint. Model AMT-Ex is ATEX certified and provides an Intrinsically Safe Dewpoint Transmitter for hazardous area use when installed with the appropriate isolator. The transmitter also incorporates an Automatic Calibration (AUTOCAL) feature, which allows the user to carry out a field calibration / span check. AUTOCAL feature is operated by means of two small button switches built within the transmitter enclosure. To avoid tamper, the switches are locked in normal use and can only be activated by following a special routine. The integral RISC microprocessor circuitry of the Model AMT-Ex transmitter allows high resolution with advanced self-diagnostics for fault conditions. It also enables periodic re-calibration of the moisture sensor, storing calibration data within the fully self-contained unit. The mechanics of the Model AMT-Ex transmitter have been designed to cope with extreme environmental conditions. The rugged stainless steel construction offers protection to IP66 (NEMA4X), with transmitter electrical connections made via secure industrial connector. Model AMT-Ex transmitter can withstand 35,000 kPa (350bar) maximum pressure and by employing a low resistance cable, the transmitter can be located significant distances, in excess of 1000 metres, from the safe area. Designed with the operator in mind, for reliable and accurate measurements, Model AMT-Ex is extremely easy to install and operate, requiring little or no maintenance. The Model AMT-Ex transmitter is supplied with a Certificate of Calibration, an instruction manual and 2m connecting cable.
Sampling Systems are engineered solutionsfor extracting and analysing a representativesample of the process air or gas which is then either vented off to atmosphereor returned back to the process.
Alpha Moisture Systems range of samplingsystems have been developed through manyyears of experience in industrial moistureanalysis. All systems are built using thehighest quality components to ensure longterm performance and reliability even in thetoughest of applications.
Our standard range of Sampling Systemsshown here are designed to cater for mostapplications, however if your particularrequirements are not met by any of thoseshown, our design engineers would only betoo happy to advise and custom design foryour specific application.
Reliability, serviceability and well plannedlayout are of paramount importance in asampling system. In view of this all oursystems are constructed to the higheststandards using quality components and withthe following general features :-
• Sample pipework and components built onto alu-minium front panel for support and neat layout.
• Clear flow schematic on front panel withlabelling of all major components.
• Modular construction for panel, surface or weath-erproof mounting.
• All pipework in stainless steel using high quali-ty compression fittings also of stainless steel.
• All internal electrical connections wired to mainterminal block.
SPECIFICATIONS - Model SS I
AUXILIARYINLET
SAMPLEINLET
SAMPLEPRESSURECONTROL SAMPLE
PRESSURE
SAMPLEOUTLET
SAMPLEFLOW RATE
SAMPLEFILTER
0
10
20 30
4050
L/M54321
Model SSILow Pressure Sample System - Maximum inlet pressure up to 28 barg, withsensor opertaing at atmospheric pressure.
This system is designed for gas or general compressed air sampling formaximum inlet pressure of 28 barg, with the moisture sensor operating atatmospheric pressure. The system provides for all necessary pressureand flow control and includes sample filtration to protect againstparticulate contamination. Auxiliary inlet connection is provided for asecond sample stream or for injection of a calibration gas. An outletconnection is also included to allow sample recovery or disposal.