BASIC DESCRIPTION20 & 25 SERIES PRESSURE/VACUUMSWICHGAGEÒ.20 Series (2-1/16", 52mm mounting hole) and 25 series(2-11/16" 68mm mounting hole) have steel cases andare diaphragm actuated. The pointer/contact groundsthrough the case to complete the switch circuit. The limitcontact(s) is wired to power, through a Murphy MagneticSwitch. See diagrams for SWICHGAGEâ wire colorcode. Contacts are rated 2A @ 30V resistive(pilot duty);gauge connection is 1/8-27 NPT. See installation andtypical wiring diagrams for wire up of SWICHGAGEâand Murphy magnetic switch.A20 & A25 SERIES PRESSURE/VACUUMSWICHGAGE.A20 series 12-1/16", 52mm mounting hole) and A25series (2-11/16 68mm mounting hole) havepolycarbonate cases and are diaphragm actuated.These cases have molded, isolated terminals for switchcontact: the pointer-contact is wired to common orground: the limit contact(s) is wired to power, through aMurphy magnetic switch. See SWICHGAGEÒ diagramsfor terminal codes. Contacts 2A @ 30V resistive (pilotduty); gauge connection 1/8-27 NPT. See installationand typical wiring diagrams on this sheet, for wire up ofSWICHGAGEand Murphy magnetic switch.STANDARD ELECTRICAL DIAGRAMS: 20 & 25 - PRESSURE/VACUUM SERIESTHESE DIAGRAMS ARE SHOWN WITH POINTER IN THE NORMAL OPERATING RANGE.Std. Switch Rating:Pilot Duty 2A @Micro-Switch Rating: 3A @ 30 VDC inductive30 VAC/DC resistive4A @ 125 VAC inductiveSTANDARD ELECTRICAL DIAGRAMS: A20 - PRESSURE/VACUUM SERIESTHESE DIAGRAMS ARE SHOWN WITH THE GAUGE POINTER IN THE NORMAL OPERATING RANGE.Std. Switch Rating:Pilot Duty 2A @Micro-Switch Rating: 3A @ 30 VDC inductive30 VAC/DC resistive4A @ 125 VAC inductiveSTANDARD ELECTRICAL DIAGRAMS: A-25 - PRESSURE/VACUUM SERIESTHESE DIAGRAMS ARE SHOWN WITH TEMPERATURE POINTER IN NORMAL OPERATING RANGEStd. Switch Rating:Pilot Duty 2A @Micro-Switch Rating: 3A @ 30 VDC inductive30 VAC/DC resistive4A @ 125 VAC inductive
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