sect.
70 ys6490
rev. A 2017/07/20
ESPS, ESTS series
Pressure and Temperature Combined Senders/Switches
The ESPS and ESTS series are engine-mounted oil pressure
and coolant temperature measurement sensors with both
resistive sender and fault limit switch outputs.
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. a 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 (see How
To Order for preset temperature 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.
Specifications
ESPS pressure models ESTS temperature models
Pressure process connection: 1/8”-27 NPTF dryseal Temperature bulb connection: 5/8”-18 UNF
Measurement pressure range: 0 - 100 psi (689 kPa, 6.89 Bar) Measurement temperature range:
Maximum operating pressure: 100 psi (689 kPa, 6.89 Bar) 38- 121°C /100 – 250°F (model ESTS-250) or
Switch set point: 15 PSI (103kP7a, 1.03 Bar) falling 38- 148°C /100 – 300°F (model ESTS-300)
Switch contacts: closed when pressure falls below set point Switch set point: 105°C/221°F or 130°C/266°F, ±3°C
Contact rating: 5.6W (28VDC, 200mA) max Switch contacts: closed when temperature rises above set point
Exterior case material: Zinc plate Chromate Contact rating: 5.6W (28VDC, 200mA) max
Electrical connection: 10-32 UNF-2A studs (x2), Electrical connection: blade terminals, 6.3 mm / 0.248 in. (sender) and
brass-tin plate. Brass hex nut. 4.8 mm / 0.0189 in. (switch)
Dimensions: see separate section Dimensions: see separate section
In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time. MURPHY products and the Murphy
logo are registered and/or common law trademarks of Enovation Controls, LLC. This document, including textual matter and illustrations, is copyright protected by Enovation Controls, LLC,
with all rights reserved. © 2017 Enovation Controls, LLC. A copy of the warranty may be viewed or printed by going to http://www.murphybyenovationcontrols.com/warranty.
Dimensions Sender Resistance Characteristics
ESPS pressure models: ESPS pressure models:
Pressure, PSI Nominal Tolerance, Ohms
mm (in.) resistance, Ohms
0 (descending) 240 227 – 257
50 (descending) 103 92 – 114
100 (ascending) 33.5 22 - 49
ESTS temperature models:
Temperature Nominal Tolerance, Ohms
resistance, Ohms
37.8°C / 100°F 1123 1022 – 1224
82.2°C / 180°F - 197 – 223
104.4°C / 220°F - 99 – 110
137.8°C / 280°F - 39 - 46
ESTS temperature models:
mm (in.)
How to Order
Note: ESPS and ESTS orders are subject to a minimum order quantity of 100 units.
Stock code Model Description
05.70.7753 ESPS-100 ESPS-100 pressure sender/switch, 1/8” NPT thread,
sender range 0-100 PSI, switch set at 15 PSI
10.70.7582 ESTS-250 ESTS-250 temperature sender/switch, 5/8” -18 UNF thread,
sender range 38 – 121°C / 100 – 250°F, switch set at 105°C / 221°F
10.70.7583 ESTS-300 ESTS-300 temperature sender/switch, 5/8” -18 UNF thread,
sender range 38 – 148°C / 100 – 300°F, switch set at 130°C / 266°F
