Instruction Booklet: 2025P-INSEffective: 10-15-83123456789 Revision: 9-28-84INSTRUCTIONS FOR INSTALLATION & MAINTENANCEOF PRESSURE & VACUUM SWICHGAGES®SERIES: 20-P, 25-P, A20-P, A25-PINCLUDING V, VWC, ABS, EO, DP MODELSTYPICAL PRESSURE SWICHGAGE®A SWICHGAGEâ is an indicating gauge, having adjustable limitcontacts that act as switches when closed with the gauge'spointer/contact. SWICHGAGESâ are available in various sizesand shapes to adapt to most applications, for temperature,pressure, liquid level, vibration, or speed. These are dry contacttype switches for light duty electrical switching and should beused with a Murphy Magnetic Switch or Transformer Relay.Both electrical and mechanical experience is necessary forproper installation and maintenance.TYPICAL TATTLETALE MAGNETIC SWITCH"TATTLETALE Magnetic SwitchesMurphy manufactures several, patented magnetic switches forprotection of the light duty SWICHGAGE contacts and to ensurepositive shut-down of equipment. There are magnetic switchesfor Capacitor Discharge ignition, Magneto, or battery systems,and models for electric motor driven equipment. TATTLETALESare pop-out indicators that show the cause of shut-down. Ifseveral TATTLETALES are used in conjunction on with severaldifferent SWICHGAGE, the first one out will lockout all othermagnetic switches. Be sure the type of Magnetic Switch matchesthe power source used to trip it.·Note: At equipment start-up, the magneticswitch reset button must be held In until no-mal operation occurs, unless closedSWICHGAGESÒare locked out by time delay orlockout button. (Not applicable for Mag. orC.D. power)SEE BULLETIN M-6797 FOR MURPHY TATTLETALES & MAGNETIC SWITCHES
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