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Selection of Temperature, Pressure, and Differential Pressure Switches

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Ashcroft provides a simple guide to selecting and configuring the right temperature, pressure, or differential pressure switch for an industrial control application.

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Selection of Temperature, Pressure, and Differential Pressure Switches

  1. 1. EIGHT STEPS TO SELECTING A PRESSURE, DIFFERENTIAL PRESSURE OR TEMPERATURE SWITCH Ashcroft offers several different pressure, differential pressure and temperature switch models. This guide will help you select the best model for your application. In many cases there may be more than one choice, so the lower cost option is usually the best choice. As a guideline a NEMA 7 rated switch will cost more than a NEMA 4 rated switch. A Stainless Steel housing will cost more than a die cast Aluminum or Brass housing. A dual chamber design more than the standard housing. The Eight Steps: 1. Does the applications require an Explosion Proof (NEMA 7) housing or a Watertight (NEMA 4) housing? 2. Do you need single or dual set points? 3. Do you need fixed or adjustable dead band? 4. Do you need an adjustable set point switch or a factory set only switch (this step is only for Pressure Switches)? 5. Select the appropriate switch model listed in the step 5 boxes in the pressure, differential pressure or temperature switch selection charts. This selection would be based on comparing the basic size and features of the switch models listed in the box based on your choices for the first 4 steps. Refer to the appropriate switch product matrix or catalog page for more information on the switch models. 6. Determine the operation range needed from the appropriate switch model range charts. 7. Select the appropriate micro switch based on your electrical requirements and deadband requirements. 8. Select the wetted materials and process connection based on your process media and piping. At this point you should be able to build the appropriate switch part number by following the “How to order this switch” section on the appropriate catalog page. Additional switch options should also be added to the part number. Rev. A 07/15, Page 1 of 6 Product Information Page Ashcroft® Switches All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 Applicable to: PIP #: SW-PI-70A
  2. 2. Rev. A 07/15, Page 2 of 6 Product Information Page All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 PRESSURESWITCHSELECTIONSTEP NUMBER 2 1. 3 4 5 ENCLOSURE TYPE ExplosionProof(NEMA7)Watertight(NEMA4) DualSingleSingleDual FixedAdjustable FactoryField SetOnlyAdjustablity . FieldFactory AdjustablitySetOnly AdjustableFixed SET POINTS SETPOINT ADJUSTABILITY FIXED DEAD BAND ONLY DEAD BAND DEAD BAND APAN7 B7 FPSN7 PPSN7 PPAN7 NPAN7 PPDN7LPDN4 GPDN4 LPAN4 GPAN4 NPAN4 NPIN4 APAN4 B4 LPSN4 GPSN4 H4 APSN7 6.Determinetheoperationrangeneededfromtheappropriateswitchmodelrangecharts. 7.Selecttheappropriatemicroswitchbasedonyourelectricalrequirementsanddeadbandrequirements. 8.Selectthewettedmaterialsandprocessconnectionbasedonyourprocessmediaandpiping. Atthispointyoushouldbeabletobuildtheappropriateswitchpartnumberbyfollowingthe“Howtoorderthisswitch” sectionontheappropriatecatalogpage.Additionalswitchoptionsshouldalsobeaddedtothepartnumber. FIXED DEAD BAND ONLY SETPOINT ADJUSTABILITY SET POINTS APAN4 APSN4
  3. 3. Rev. A 07/15, Page 3 of 6 Product Information Page All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 PRESSURESWITCHPRODUCTMATRIX ENCLOSURE/PROCESSINPUTCONTROLFUNCTIONSWITCHTYPEWETTEDMATERIALRANGES B4 H4 B7 PPA PPD PPS LPA LPD LPS GPA GPD GPS FPS APA APS NPA NPI Watertight(NEMA4) ExplosionProof(Nema7) StainlessSteelBody Pressure DifferentialPressure Temperature SingleFixedSetpoint SingleAdjustableSetpoint AdjustableDeadband TwoIndep.Adjust.Setpoints FixedDeadband GeneralPurpose NarrowDeadband HermeticallySealed ManualReset Relay DPDT Buna Viton Teflon StainlessSteel Monel Vacuum CompoundInchesofWater InchesofWater Compound 0-400psi 0-600psi 1000psi 2000psi 3000psi 4000psi 5000-20,000psi -40–750°F 5000 7500
  4. 4. Rev. A 07/15, Page 4 of 6 Product Information Page All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 DIFFERENTIALPRESSURESWITCHSELECTIONSTEP NUMBER 2. 1. 3. 4. ENCLOSURE TYPE ExplosionProof(NEMA7)Watertight(NEMA4) DualSingleSingleDual FixedAdjustableAdjustableFixed SET POINTS FIXED DEAD BAND ONLY DEAD BAND DEAD BAND D7 PDSN7PDAN7PDDN7LDDN4 GDDN4 LDAN4 GDAN4 D4 LDSN4 GDSN4 5.Determinetheoperationrangeneededfromtheappropriateswitchmodelrangecharts. 6.Selecttheappropriatemicroswitchbasedonyourelectricalrequirementsanddeadbandrequirements. 7.Selectthewettedmaterialsandprocessconnectionbasedonyourprocessmediaandpiping. Atthispointyoushouldbeabletobuildtheappropriateswitchpartnumberbyfollowingthe“Howtoorderthisswitch” sectionontheappropriatecatalogpage.Additionalswitchoptionsshouldalsobeaddedtothepartnumber. FIXED DEAD BAND ONLY SET POINTS
  5. 5. Rev. A 07/15, Page 5 of 6 Product Information Page All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 DIFFERENTIALPRESSURESWITCHPRODUCTMATRIX ENCLOSURE/PROCESSINPUTCONTROLFUNCTIONSWITCHTYPEWETTEDMATERIALRANGES D4 D7 PDA PDD PDS LDA LDD LDS GDA GDD GDS Watertight(NEMA4) ExplosionProof(Nema7) StainlessSteelBody Pressure DifferentialPressure Temperature SingleFixedSetpoint SingleAdjustableSetpoint AdjustableDeadband TwoIndep.Adjust.Setpoints FixedDeadband GeneralPurpose NarrowDeadband HermeticallySealed ManualReset Relay DPDT Buna Viton Teflon StainlessSteel Monel Vacuum CompoundInchesofWater InchesofWater Compound 0-400psi 0-600psi 1000psi 2000psi 3000psi 4000psi 5000-20,000psi -40–750°F
  6. 6. Rev. A 07/15, Page 6 of 6 Product Information Page All specifications are subject to change without notice. All sales subject to standard terms and conditions. © 2015 Ashcroft Inc. ashcroft.com info@ashcroft.com 1.800.328.8258 TEMPERATURESWITCHSELECTIONSTEP NUMBER 2. 1. 3. 4. ENCLOSURE TYPE ExplosionProof(NEMA7)Watertight(NEMA4) DualSingleSingleDual FixedAdjustableAdjustableFixed SET POINTS FIXED DEAD BAND ONLY DEAD BAND DEAD BAND T7 PTSN7 PTAN7PTDN7 LTDN4 GTDN4 LTAN4 GTAN4 T4 LTSN4 GTSN4 5.Determinetheoperationrangeneededfromtheappropriateswitchmodelrangecharts. 6.Selecttheappropriatemicroswitchbasedonyourelectricalrequirementsanddeadbandrequirements. 7.Selectthewettedmaterialsandprocessconnectionbasedonyourprocessmediaandpiping. Atthispointyoushouldbeabletobuildtheappropriateswitchpartnumberbyfollowingthe“Howtoorderthisswitch” sectionontheappropriatecatalogpage.Additionalswitchoptionsshouldalsobeaddedtothepartnumber. FIXED DEAD BAND ONLY SET POINTS

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