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FW Murphy 45APE Gauge/Switchgage

The 45APE Series gage instrument is a mechanical gage for pressure indication.

It includes two adjustable SPDT switches. These snap-acting switches can be used for start and stop, to trip alarms and to shut down equipment. Ranges are available from 30 psi (207 kPa) [2.06 bar] thru 5,000 psi (34.48 MPa) [344.73 bar].

The 45APE Series utilizes a bourdon tube sensing unit with a stainless steel dual-sector geared movement. Each of the sectors drives separate pointers when pressure is applied to the bourdon tube. The indicating pointer (visible pointer) shows actual pressure reading, including below and beyond the low and high trip points. The low and high trip points are adjustable independently on the gage front lens. The switch operator pointer (behind the dial) is calibrated to follow the indicating pointer. The low and high trip point indicators arrest the switch operator pointer. As pressure decreases or increases through the principal of lost motion, the respective snapswitch is tripped.

The 45APE Series models are widely used in applications requiring pressure indication and Form C low and high pressure switches.

FW Murphy 45APE Gauge/Switchgage


White on black, dual scale, psi and kPa standard, 4-1/2 in. (114 mm) diameter
Die cast aluminum, surface or panel mount
Do not exceed 10% FS above full range
Process Connection:
1/4 NPTM thru 1000 psi; 1/2 NPTM 1,500 - 5,000 psi; back connection optional
Sensing Element:
Bronze or 316 stainless steel bourdon tube


  • Combination Indicating Gage with Independent Low and High Snap-Acting Switches
  • Field-Adjustable and Highly Visible Low and High Pressure Trip Point Indicators
  • Dual-Sector Geared Movement Allows for Full-Scale Indication and Set Point Control
  • Panel and Surface Mount Versions Available
  • Latching Control Relay Versions Available