Dwyer Instruments, Inc.P.O.Box 373/Michigan City, Indiana 46361/Phone 219 879-8000/Fax 219 872-9057 • U.K.Phone (+44) (0)1494-461707 • Australia Phone 61 2 4272-2055 9 Pressure ® FEATURES • Visible calibrated dial • On/off indication (except hermetically sealed snap switch models) • Adjustable or fixed deadband • SPDT snap-action, hermetically sealed snap action or hermetically sealed mercury switch • External switch setpoint adjustments • Minimum deadband is obtainable at any point in the range • Pressure Ranges of full vacuum to 8000 psig. • UL listed, CSA approved. Many models FM approved. • General purpose, weatherproof or explosion-proof enclosures SPECIFICATIONS Wetted Materials: Brass, 403 SS, or 316 SS. Temperature Limit: 180°F (82°C). Pressure Limit: Maximum pressure of the operating range. Enclosure Rating: General purpose, weatherproof or explosion- proof. Repeatability: ±1% of full operating range, ±1.5% on DS-7300 models. Switch Type: SPST mercury switch, SPDT mercury switch, SPDT snap switch, or SPDT hermetically sealed snap switch. Other cir- cuit types available. Electrical Rating: See model charts. Electrical Connections: Screw terminal. Conduit Connection: General purpose: 1/2˝ hole for conduit hub. Weatherproof: 1/2˝ conduit hub. Explosion-proof: 3/4˝ female NPT. Process Connection: General purpose and weatherproof: 1/4˝ male NPT, 1/2˝ male NPT on ranges 15S and 16S. Explosion-proof: 1/2˝ male NPT and 1/4˝ female NPT. Mounting Orientation: Vertical. Set Point Adjustment: Thumbscrew. Weight: General purpose: 4 lb (1.8 kg), weatherproof: 6 lb (2.7 kg), explosion-proof: 8 lb (3.5 kg). Deadband: See model chart. Series D Bourdon Tube Pressure Switches Pressure Ranges to 8000 psi (551.6 bar) Customers tell us that this is the best pressure switch made. The Mercoid D Series is one of the world’s broadest lines of pres- sure switches. Whatever your application might be, it is most prob- able it can be fully satisfied with a D Series pressure switch. The D Series has extremely high sensitivity and great repeatablil- ity. The DA Models are equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, the difference between high and low setpoints, is adjustable over the full scale. The DS Models are equipped with a single external adjustment for setting operating point only. The deadband is fixed at a factory setting and cannot be altered in the field. For switches choose between the snap action switch, hermetically sealed snap action switch and her- metically sealed mercury switch. How to Order Mercoid Series D Pressure Switches Operating Requirements D is the generic designation for the pressure switch series. The next letter following the D designates the function of the switch with regard to the type of deadband and operation. DA , for exam- ple, means a D series pressure switch that has an adjustable dead- band with double adjustments and is fully automatic. See page 10 for more information. Enclosures A general purpose NEMA 1 enclosure is furnished as standard on all Series D pressure switches. Weatherproof and explosion-proof housings are optionally available and designated by adding a third character to the model number. DAW , for example, indicates a DA pressure switch with a weatherproof enclosure. See page 13 for more information. Wetted Material The D Series is available with Bourdon tubes constructed of brass, Type 403 stainless steel, and Type 316 stainless steel. Material is designated as part of the series type number with 3 corresponding to brass, 2 to 403 stainless steel, and 4 to 316 stainless steel. For example, DA-3 1, DA-703 1, DS-723 1, and DA-53 1 all have brass bourdon tubes. Shown in the left hand column of the sample model number charts on pages 11 and 12. Switch Type and Action Mercoid Series D pressure switches are available with mercury or snap-action contacts. Snap-action switch models always start with the series type number of 7. For example, DA-7031 and DS-7231 are both snap switch models. Snap switches are availale in SPDT and DPDT while the mercury switches are available in SPST, SPDT, DPDT, and DPST. The switch code designates the type of contact and follows the series type number in the overall model number. For example, DA-7031-153 is a SPDT snap switch while DA-31-153 is a SPDT mercury switch. Contact rating should also be considered when choosing the contact type. Shown across the top of the columns of the sample model number charts on pages 11 and 12. Operating Range The last part of the Series D model number is the operating range number. Operation of the switch is adjustable within the limits of the shown operating range. The upper limit of the adjustable op- erating range is also the maximum pressure for the switch and should not be exceeded. For example, DAW-33-3-2 has range num- ber 2, which is 0 to 30˝ Hg vacuum. Shown in the second column of the sample model number charts on pages 11 and 12. A complete model number chart is included on pages 16 and 17.
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Series Bourdon Tube Pressure Switches Descventura.com/manuals/merc_pressSwitchSeriesD_ig.pdf · The D Series is available with Bourdon tubes constructed of brass, Type 403 stainless
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Dwyer Instruments, Inc. P.O. Box 373/Michigan City, Indiana 46361/Phone 219 879-8000/Fax 219 872-9057 • U.K. Phone (+44) (0)1494-461707 • Australia Phone 61 2 4272-2055 9
sealed snap switch models)• Adjustable or fixed deadband• SPDT snap-action, hermetically sealed snap action or
hermetically sealed mercury switch• External switch setpoint adjustments• Minimum deadband is obtainable at any point in the range• Pressure Ranges of full vacuum to 8000 psig. • UL listed, CSA approved. Many models FM approved.• General purpose, weatherproof or explosion-proof
enclosures
SPECIFICATIONSWetted Materials: Brass, 403 SS, or 316 SS.Temperature Limit: 180°F (82°C).Pressure Limit: Maximum pressure of the operating range.Enclosure Rating: General purpose, weatherproof or explosion-proof.Repeatability: ±1% of full operating range, ±1.5% on DS-7300models.Switch Type: SPST mercury switch, SPDT mercury switch, SPDTsnap switch, or SPDT hermetically sealed snap switch. Other cir-cuit types available.Electrical Rating: See model charts.Electrical Connections: Screw terminal.Conduit Connection: General purpose: 1/2˝ hole for conduithub. Weatherproof: 1/2˝ conduit hub. Explosion-proof: 3/4˝female NPT.Process Connection: General purpose and weatherproof: 1/4˝male NPT, 1/2˝ male NPT on ranges 15S and 16S. Explosion-proof:1/2˝ male NPT and 1/4˝ female NPT.Mounting Orientation: Vertical.Set Point Adjustment: Thumbscrew.Weight: General purpose: 4 lb (1.8 kg), weatherproof: 6 lb (2.7kg), explosion-proof: 8 lb (3.5 kg). Deadband: See model chart.
SeriesD Bourdon Tube Pressure Switches
Pressure Ranges to 8000 psi (551.6 bar)
Customers tell us that this is the best pressure switch made.The Mercoid D Series is one of the world’s broadest lines of pres-sure switches. Whatever your application might be, it is most prob-able it can be fully satisfied with a D Series pressure switch. The D Series has extremely high sensitivity and great repeatablil-ity. The DA Models are equipped with two external adjustments,one for setting high pressure operating point, the other for settinglow pressure operating point. Deadband, the difference betweenhigh and low setpoints, is adjustable over the full scale. The DSModels are equipped with a single external adjustment for settingoperating point only. The deadband is fixed at a factory setting andcannot be altered in the field. For switches choose between thesnap action switch, hermetically sealed snap action switch and her-metically sealed mercury switch.
How to Order Mercoid Series D Pressure SwitchesOperating RequirementsD is the generic designation for the pressure switch series. Thenext letter following the D designates the function of the switchwith regard to the type of deadband and operation. DA, for exam-ple, means a D series pressure switch that has an adjustable dead-band with double adjustments and is fully automatic. See page 10for more information.
EnclosuresA general purpose NEMA 1 enclosure is furnished as standard onall Series D pressure switches. Weatherproof and explosion-proofhousings are optionally available and designated by adding a thirdcharacter to the model number. DAW, for example, indicates a DApressure switch with a weatherproof enclosure. See page 13 formore information.
Wetted MaterialThe D Series is available with Bourdon tubes constructed of brass,Type 403 stainless steel, and Type 316 stainless steel. Material isdesignated as part of the series type number with 3 correspondingto brass, 2 to 403 stainless steel, and 4 to 316 stainless steel. Forexample, DA-31, DA-7031, DS-7231, and DA-531 all have brassbourdon tubes. Shown in the left hand column of the sample modelnumber charts on pages 11 and 12.
Switch Type and ActionMercoid Series D pressure switches are available with mercury orsnap-action contacts. Snap-action switch models always start withthe series type number of 7. For example, DA-7031 and DS-7231are both snap switch models. Snap switches are availale in SPDTand DPDT while the mercury switches are available in SPST,SPDT, DPDT, and DPST. The switch code designates the type ofcontact and follows the series type number in the overall modelnumber. For example, DA-7031-153 is a SPDT snap switch whileDA-31-153 is a SPDT mercury switch. Contact rating should also beconsidered when choosing the contact type. Shown across the topof the columns of the sample model number charts on pages 11 and12.
Operating RangeThe last part of the Series D model number is the operating rangenumber. Operation of the switch is adjustable within the limits ofthe shown operating range. The upper limit of the adjustable op-erating range is also the maximum pressure for the switch andshould not be exceeded. For example, DAW-33-3-2 has range num-ber 2, which is 0 to 30˝ Hg vacuum. Shown in the second column ofthe sample model number charts on pages 11 and 12.
A complete model number chart is included on pages 16 and 17.
pg9 3/8/05 1:08 PM Page 1
Dwyer Instruments, Inc. P.O. Box 373/Michigan City, Indiana 46361/Phone 219 879-8000/Fax 219 872-9057 • U.K. Phone (+44) (0)1494-461707 • Australia Phone 61 2 4272-205510
Pre
ssu
re
Bourdon Tube Pressure SwitchesSeriesD
Equipped with a single adjustment for setting operatingpoint to operate the circuit automatically upon a pressureincrease or decrease. Pushbutton reset must be operatedmanually to restore the circuit to original position afterautomatic operation. Suffix “L,” i.e. DR-31-153L denotescontrol will operate automatically on increase; suffix “U”denotes control will operate automatically on decrease.
Equipped with a single adjustment for setting operatingpoint. Control will operate at setpoint only upon a decreasein pressure. Manual lock feature permits circuit to be resetand locked in position. Lock remains in effect until pres-sure rises above control setting. Lock then releases andcircuit is held in reset position until further automatic op-eration upon pressure decrease.
Provides two stage control byactuating one circuit upon a riseor fall in pressure and a secondcircuit on a further rise or fall.Each setpoint has a fixed dead-band.
Equipped with two external adjustments, one for settinghigh pressure operating point, the other for setting lowpressure operating point. Deadband, or the difference be-tween high and low setpoints, is adjustable over full scale.Mercoid’s most popular operating mode, available on mostSeries D pressure and temperature controls.
Type DAAdjustable Deadband, Fully Automatic,
Double Adjustments
MercurySwitch
Snap-ActionSwitchContact
Type DSFixed Deadband, Fully Automatic,
Single Adjustment
MercurySwitch
Snap-ActionSwitchContact
Equipped with single adjustment for setting operatingpoint only. A single pointer on scale sets pressure pointat which switch action occurs. Fixed deadband is factoryset and cannot be altered in the field. Available on seriesD-200, D-7200 and D-9200 only.
Type DLSemi-Automatic, Manual Lock Reset,
Single Adjustment
ManualLockReset
Type DRSemi-Automatic, Manual Reset,
Single Adjustment
ManualReset
Type D-400, DA-7400Two-Stage, Fully Automatic, 2 Set Pts.
VISIBLECALIBRATED DIAL
DOUBLEEXTERNALADJUSTMENTS
SWITCHINDICATOR
VISIBLECALIBRATED DIAL
DOUBLEEXTERNALADJUSTMENTS
SWITCHINDICATOR
VISIBLECALIBRATED DIAL
SINGLEEXTERNALADJUSTMENT
VISIBLECALIBRATED DIAL
RESET
SINGLEEXTERNALADJUSTMENT
VISIBLECALIBRATED DIAL
RESET
SINGLEADJUSTMENT
VISIBLECALIBRATED DIAL
SINGLEEXTERNALADJUSTMENT
pg10 3/8/05 1:09 PM Page 1
Rick Hurdle
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Dwyer Instruments, Inc. P.O. Box 373/Michigan City, Indiana 46361/Phone 219 879-8000/Fax 219 872-9057 • U.K. Phone (+44) (0)1494-461707 • Australia Phone 61 2 4272-2055 11
Bourdon Adjustable Minimum Model Fixed Model Fixed ModelTuberial Operating Range Deadband Number Deadband Number Deadband NumberMaterial (psig) (psig) (psig) (psig)
For outdoor or indoora p p l i c a t i o n s .Complies with hosetest and require-ments for watertight,
dust-tight, drip-tight weatherproof, weather-re-sistant, splash-proof, sleet-proof, and moisture-re-sistant. Flanged, heavy gauge steel case with trans-parent cover for visible on-off operation. Externaladjustments protected by cover. Bottom pressureconnection. 1/4� NPT. Electrical connection backof case for 1/2� conduit, removable 1/2� hub.Shipping wt. 6 lbs. See above for dimensions.Optional, add “W” to prefix, i.e. DAW, DRW, DSW,when ordering.
General PurposeTypes DA, DS, DR, DLDrawing No. 1000B
Diaphragm SealTypes MSAGDrawing No. 2305
WeatherproofTypes DAW, DSW, DRWDrawing No. 1062
Flange for Surface MountingDrawing No. 1000FPN 17-20(2)
Explosion-Proof Type HHazardous AreaEnclosure suitablefor Class I, Groups C& D, Class II, GroupsE, F & G; NEMA 7 &9 applications. Con-trol mechanism is anintegral part of en-closure and cannot be
replaced in the field. For surface, panel or pipemounting. Aluminum case with glass window incover for visible on-off operation. Bottom pressureconnection, 1/2� male NPT � 1/4� female NPT.External adjustments. Available with breather anddrain. Shipping wt. 8 lbs. (3.6 kg.). See above fordimensions. Optional housing, to order add “H” toprefix. Example: DAH, DRH, or DSH. Not avail-able on D80 Series.
NOTE: Standard general purpose NEMA 1 and NEMA 4 enclosures are suitable for Class I,Division 2 applications with addition of conduit hub (mercury switch models only).
For DA, DAF, DS, DSF, DR,DRF and DL controls only.May be ordered separatelyfor field installation.
Part No. 17-26(except on 15S, 16S)Part No. 17-31(for range 15S, 16S only)
Mounting Bracket
For use with standardNEMA 1 enclosure generalpurpose controls only: SeriesDA, DAF, DS, DSF, DR,DRF, DL. Note: not adaptablefor Range 15S and 16S.Part No. 33-25
Conduit Hub
For 1/2� rigid conduit.Mercury switch type controlswith standard general pur-pose NEMA-1 or optionalweather-resistant NEMA-3 orNEMA-4 enclosures are suit-able for Class 1, Div. 2applications when orderedwith this hub. Available forDA Series.Part No. 42-413
DELRIN® Bushed Movement “B”*Registered Trademark of E.I. DuPont de Nemours & Co.
Provides longer service life for SeriesD pressure and temperature con-trols. Vibration and pulsation are theprime causes of control wear. Almostall types of vibration will have someeffect on the life and continued ac-curacy of controls.
To offset the wearing of metal sur-faces found in bearings and pivot
points, the control mechanism is de-signed to incorporate Delrin bushedmovements at each possible wearpoint. Also for environments wherecorrosion may be a factor.
Add Letter B After Type and Suffix Nos. Example: DS-221-2B, DA-31-3B, DAH-41-3B.
Breathers & Drains
For Class I, Groups C, D andClass II, Groups E, F, G(water only). Mercoid S.S.drains are flame-tight, but notwatertight which permitswater to escape continuously.
Mercoid S.S. breathers in-clude a water shedding capand provide effective caseventilation.
For Series DAH, DAHF,DRH, DRHF, DSH, DSHF.Part No. 42-274 –Standard drain.
Part No. 42-276 –Standard breather.
For Series DAE, DRE.Part No. 42-275 – Drainwith 1/4� connection.*Part No. 42-276 –Standard breather with1/2� connection.*Part No. 42-279 –Reducer (3/4� to 1/2�) forbreather.*Breather and reducermust be ordered togeth-er.
Pigtail Siphon
Recommended for steam ap-plications 35 psig or higher.For Series D-30, D-530, D-230, D-7030, D-7230 pres-sure controls. Please specify.
Part No. 42-58 2000 psig max.
STANDARD BREATHER
STANDARD DRAIN
PIVOT POINTBEARINGS,TOP & BOTTOM,BUSHED WITH DELRIN
SWITCH CARRIERSTOP POST SLEEVEDWITH DELRIN
DELRIN PIN
DELRIN PIN
BAR LINKDELRIN BRUSHED
PIVOTAL ENDBEARING &
CONNECTIONBAR PIN OF
DELRIN
Cover OverExternal
Adjustments
pg14 3/8/05 1:13 PM Page 1
Dwyer Instruments, Inc. P.O. Box 373/Michigan City, Indiana 46361/Phone 219 879-8000/Fax 219 872-9057 • U.K. Phone (+44) (0)1494-461707 • Australia Phone 61 2 4272-2055 15
FEATURESProtects to 2,500 psig • Available to 5,000 psig • External adjustment • Ad-justable or fixed deadband • Integral over-pressure seal • 316 Stainless Steeldiaphragm • Operates in ambient temperatures –10 to +140°F. • Availablewith mercury or snap switch.
APPLICATIONFor low pressure setpoints in a system where normal pressures may rise to5,000 psig. An over-pressure seal protects the control beyond a predeter-mined pressure. When that pressure is exceeded, the diaphragm seats andno further motion is transmitted.
RANGE NO. MIN. DEADBAND (psig) FIXED DEADBANDAdjustable Operating Range (psig) DA-931 DA-9531 DS-9231
NOTES: Above controls must have seal attachedDA-9 = Indicates slugged bourdon tube
Type MSAG/MSAH FEATURESMaximum seal design pressure is 2500 psig forMSAG and MSAH, 100 psig XTBX. Seals canbe filled after installation via Bleed Screw (7) indiagram at right. Thin, flexible diaphragm (2)is actuated by system pressure. Diaphragmtransmits system pressure to seal’s liquid fill(3) to operate the Bourdon tube of the pro-tected control which attaches at (1). Chemicalcorrosion or other damage to seal from sys-tem’s pressure medium can be prevented byproper selection of materials for the di-aphragm, (2) bottom bowl (8) and other sur-faces which the pressure medium will contact.
APPLICATIONMercoid diaphragm seals prevent corrosive, vis-cous or other damaging pressure media (gas, liq-uid, etc.) from entering the pressure powerelement (Bourdon tube) in pressure or differen-tial pressure controls. Plain seals cannot be field-disassembled for cleaning or other purposes.Mercoid clean-out type diaphgram seals can befield-disassembled for cleaning or other pur-poses. Top bowl (Key #4 in diagram at right)with both clean-out ring (9) and control attachedcan be removed while bottom bowl (8) is still con-nected to system. However, system must be shutdown beforehand.Seals cannot be used below 10� Hg vacuum.
To Order Seals – Plain or Clean-Out TypesWhen ordering, specify all of the following:• Type and pressure range of control which seal is to protect.• Diaphragm seal type desired.• Diaphragm material – 316 stainless steel, Teflon®-coated 316
stainless steel, or Tantalum.• Pressure medium-to-seal contact surfaces material-rust-
resistant finish or 316 stainless steel.• Size of seal-to-system connection 1/4�, 1/2�, 1�, or 11⁄2� NPT.• Temperature range of pressure medium.• Ambient temperatures.
Mercoid diaphragm seals are not available for Range15S & 16S Mercoid Pressure ControlsNOTE: Controls and gauges with diaphragm seals can be affectedby ambient and system temperature changes, particularly at lowpressures. For these conditions, Mercoid Controls can be fur-nished with ambient temperature compensation (available onlywhen control is mounted on seal). Write for details.Most seals can be furnished with a remote copper or S.S. tub-ing connection between seal and control. A mounting bracket(No. 33-25) may be used for remote mounted controls. Specifyif remote connection is desired.
1 Pressure Control Connection2 Diaphragm: 316SS, Teflon®-Coated 316SS or
Tantalum3 Liquid Fill4 Top Bowl, rust-resistant finish5 Seal-to-System Connection6 Flushing Connection (1/4� NPT) and
Removable Plug7 Bleed Screw8 Bottom Bowl, rust-resistant finish steel or
316SS9 Clean-Out Ring
OPERATING RANGESBrass Bourdon Tube, with Mercury Switch