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The ESPS and ESTS series are engine-mounted oil pressure and coolant temperature measurement sensors with both resistive sender and fault limit switch outputs.

The resistive sender outputs have the same pressure/temperature versus resistance characteristics as the Murphy ES series senders, allowing use with EG(S)21 series gauges or Swichgages, engine/genset controllers or input/output modules (e.g. the Murphy MeCAN™ interface).

Switch output contacts are normally open (at normal running pressures and temperatures), with the contacts closing to sensor body/case ground when pressure falls below, or temperature rises above, the factory set limits. 

The switch outputs can be used with external control devices to signal fault conditions, and trigger operator warning and/or engine shutdown protection. For example, the contacts can be used in place of, or in addition to, EG(S)21 Swichgage outputs, to provide two-staged limits for warning and shutdown

ESPS pressure models

  • Pressure process connection: 1/8”-27 NPTF dryseal
  • Measurement pressure range: 0 - 100 psi (689 kPa, 6.89 Bar)
  • Maximum operating pressure: 100 psi (689 kPa, 6.89 Bar)
  • Switch set point: 15 PSI (103kP7a, 1.03 Bar) falling
  • Switch contacts: closed when pressure falls below set point
  • Contact rating: 5.6W (28VDC, 200mA) max
  • Exterior case material: Zinc plate Chromate
  • Electrical connection: 10-32 UNF-2A studs (x2), brass-tin plate. Brass hex nut.
  • Dimensions: see sales bulletin

ESTS temperature models

  • Temperature bulb connection: 5/8”-18 UNF
  • Measurement temperature range:
    • 38- 121°C /100 – 250°F (model ESTS-250) or
    • 38- 148°C /100 – 300°F (model ESTS-300)
  • Switch set point: 105°C/221°F or 130°C/266°F, ±3°C
  • Switch contacts: closed when temperature rises above set point
  • Contact rating: 5.6W (28VDC, 200mA) max
  • Electrical connection: blade terminals, 6.3 mm / 0.248 in. (sender) and 4.8 mm / 0.0189 in. (switch)
  • Dimensions: see sales bulletin

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