Murphy electric eg

EG / EGS Series Series Electric Gauges

The EGS21 Series Swichgage instrument has all of the features of the EG21 Series Gage plus an adjustable set point
PowerHall Effect switch output for operating alarms or equipment shutdown. The trip point is adjustable over 90% of the scale and has a set point indicator visible from the gage face. Now you can have both, the ease of electric gage installation and the reliable switching of Murphy’s famous Swichgage instrument.


• EG Air Core Movement Design

• Technological Improvements in Lighting, Accuracy in Reading and Wiring Installation

• Environmentally Sealed Design

• Exceeds the Rigid SAE J1810 Standard

• Corrosion-Resistant Materials

• Desirable for Marine and Other Environmentally Sensitive Applications

• Soft, Non-Glare Dial and Pointer Illumination by “Cold Light” LED

FW Murphy EGS21 & EG21 Specs

  • Power Input, all models and sender: 12 VDC or 24 VDC.
  • Case: Polyester (PBT), impact and weather resistant with screw-on mounting clamp.
  • Bezel: Polished 316 stainless steel standard; available in black. SAE style optional.
  • Lens: Clear Polycarbonate and UV stabilized.
  • Air Core Movement: Silicon dampened pointer.
  • Dial: Black with white markings; back-lite (marking becomes red when illuminated); dual scale with mirror band to reduce parallax reading errors.
  • Swichgage instrument Sensor: PowerHall® Effect; outputs ground signal (sinking output) rated: 300 mA continuous (EGS21 models). Pressure, Fuel, Volts set on decreasing scale. Temperature and Amps set on increasing scale.
  • Output saturation voltage (voltage drop across switch): 1.3-2.3 Volts @ 25°C (may require some conditioning to work with logic inputs)
  • Swichgage instrument Set Point Indicator: Visible on mirror band (scale); adjustable from the back of the unit (1/16 in. hex type wrench).
  • Wiring: Plug connector with wire leads, 18 AWG (1.0 mm2), 8 in. (203 mm) long.
  • Operating Temperature: -40 to 185°F (-40 to +85°C).
  • Storage Temperature: -77 to 185°F (-60 to 85°C).
  • Over Voltage (Gage Movement): Withstands 200% of nominal system voltage for 5 min. Meets SAE J1810.
  • Reversed Polarity (Gage Movement): Withstands reversed battery terminal polarity indefinitely within operating temperatures.
  • Environment and Test: Meets SAE J1810 standards.

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