Murphy Electric Gage and Swichgage, EG21, EGS21 Specifications

Electric Gage and
Swichgage

®

Instruments

Sharper Accuracy

Higher Durability

Advanced Technology

0610119 08-06
Printed in U.S.A.

Sharper Accuracy. Higher Durability. Advanced Technology.

The EG21 Series Electric Gage and the EGS21 Series Swichgage instrument take the electric gage to new

heights with proven state of the art technology and reliability.

Electric Swichgage instrument

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.

Specifications

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12 VDC or 24 VDC.

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Polyester (PBT), impact and weather resistant with screw-on mounting clamp.

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Polished 316 stainless steel standard; available in black. SAE style optional.

LLeennss::

Clear Polycarbonate and UV stabilized.

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Silicon dampened pointer.

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Black with white markings; back-lite (marking becomes red when illuminated);

dual scale with mirror band to reduce parallax reading errors.

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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)

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Visible on mirror band (scale);

adjustable from the back of the unit (1/16 in. hex type wrench).

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Plug connector with wire leads, 18 AWG (1.0 mm2), 8 in. (203 mm) long.

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-40 to 185°F (-40 to +85°C).

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-77 to 185°F (-60 to 85°C).

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Withstands 200% of nominal system voltage for 5 min. Meets SAE J1810.

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Withstands reversed battery terminal polarity indefinitely within

operating temperatures.

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Meets SAE J1810 standards.

PowerHall®is a registered trademark of Allegro MicroSystems, Inc.

Dimensions

▼ EG Air Core movement design

▼ Technological improvements in lighting,

accuracy in reading and wiring installation

▼

Assurance of highest reliability and service

▼ 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.

SWICHGAGE

0

PSI

kPa

25

0

®

Adjustable Contact Indicator

2-1/4 in.
(57 mm)

Reflective
Mirror Band

50

75

100

350

700

1-15/16 in. (49 mm)

1-15/16 in.

Mounting
Clamp

3/4 in. (19 mm) max. Panel Thickness.

2-1/2 in. (64 mm) clearance for adjustment / Wiring

(49 mm)

2-1/16 in. (52 mm)
Mounting hole diameter.

Push-on Plug and Wire Leads

18 AWG (1.0 mm

SWICHGAGE® Contact
Adjustment, 1/16 in. hex

2

); 8 in. long (203 mm)

PRESSURE

▼ ESP: 1-wire-to-ground sender

†

▼ ES2P: 2-wire ungrounded sender

†

▼

ESDP: 2-wire ungrounded sender,

it drives 2 gages

†

TEMPERATURE

▼ EST: 1-wire-to-ground sender

▼ ES2T: 2-wire ungrounded sender

▼ ESDT: 2-wire ungrounded sender,

it drives 2 gages.

FUEL LEVEL

▼ ESF: 1-wire-to-ground sender

▼ ES2F: 2-wire ungrounded sender

▼ ESDF: 2-wire ungrounded sender,

it drives 2 gages.

PRESSURE 80 psi (552 kPa) [5.52 bar]

100 psi (689 kPa) [6.89 bar]

200 psi (1.38 MPa) [13.80 bar]

300 psi (2.07 MPa) [20.70 bar]

400 psi (2.76 MPa) [27.60 bar]

TEMPERATURE 250°F (121°C)

300°F (149°C)

FUEL LEVEL Empty — 1/4 — 1/2 — 3/4 — Full

AMMETER 60 — 0 — 60 amps (internal shunt)*

VOLTMETER 12 VDC: 8 — 18 Volts

24 VDC: 16 — 36 Volts

Ranges

†

Thru 100 psi (689 kPa) [6.89 bar].

IMPORTANT:

EG21 Series gage and EGS21 Series Swichgage Movement and Illumination
require 12 VDC to function. For 24 volts systems, voltage converters are built into the electrical
wire / connector assembly and supplied with the instrument, Specify voltage when ordering.

Electric Gage Senders

Single wire
Pressure
Sender

Plate

Single wire
Temperature
Sender

Single wire
Fuel Level
Sender

Shaft

Float

Measurement Units

P = Pressure
PV = Pressure Special

*

TV=Temperature Special

**

T = Temperature

F = Fuel
AM = Ammeter
VM = Voltmeter

Base Model

EG21 = Gage
EGS21 = Swichgage

Range Scale

Show maximum value and units of measure (if other than
psi or °F) for Pressure, Temperature, Amps, and Volts

Bezel

Standard = Polished Stainless Steel
A = Black, Semi-Gloss Finish
B = SAE Low Profile Stainless

Battery Voltage

12 = 12 VDC systems
24 = 24 VDC systems

How to Order EG Senders

How to Order Accessories
and Replacement Parts

How to Order EG Series Gage and Swichgage Instruments

Sender Type

Blank = 1-wire
2 = 2-wire
D = 2-wire, dual

Range/Scale

Show maximum value and units of
measure (if other than psi or °F) for
Pressure, Temperature, Amps, Volts.

Thread Sizes

(for temperature senders)

X = 5/8-18 UNF

4)

1/8 = 1/8-27 NPT

5)

1/4 = 1/4-18 NPT
3/8 = 3/8-18 NPT
3/8B = 3/8-19 BSPT
1/2 = 1/2-14 NPT

5)

1/2B = 1/2-14 BSPT
5/8 = 5/8-18 UNF
3/4 = 3/4-14 NPT
7/8 = 7/8-9 UNC
M14 = 14 mm x1.5
M16 = 16 mm x1.5
M18 = 18 mm x1.5
M20 = 20 mm x1.5
M22 = 22 mm x1.5
M24 = 24 mm x1.5

Process to be Measured

P = Pressure

1)

PM = Pressure

2) & 3)

T = Temperature
F = Fuel

Off-Equipment Mounting Kit

This kit allows off-equipment mounting of the ESPM, ES2PM and
ESDPM pressure senders. Recommended for protection from damaging
vibration. Customer supplies hose and fittings. Specify part number
30-00-0213 when ordering.

Wire/Connector Assembly

Listed below are replacement part numbers for all wire/connector
assemblies. Voltage converter included for 24 and 32 volt. Specify part
number when ordering.

1)

Thru 100 psi (689 kPa) [6.89 bar].

2)

Ranges above 100 psi (689 kPa) [6.89 bar].

3)

Mounting off-equipment recommended.

4)

Straight threads, for use with adapter nut.

5)

Separate adapter nut not required.

NOTE: Boot is optional on ES2T

and ESDT temperature senders.
Specify p/n 00-00-3624.
Fuel level senders are for fuel tanks only .
Tank depths 6-24 in. (152-610 mm).

*Available only as EG21PV-80-12 or -24-A. This model is designed to read senders with

resistance curve of 9.5 to 182 ohms, which are commonly supplied as standard senders.

**Available only as EG21TV-300-12 or -24-A. This model is designed to read senders with

resistance curve of 240 to 18 ohms, which are commonly supplied as standard senders.

LOW VOLUME CONFIGURATIONS NOTE:

Low volume configurations may require minimum purchase quantities.

EGS21

P – 100 –12 – A

12 VDC 24 VDC

EG21P/ T/F 05004506 05006166 (05004546)
EGS21P/ T/F 05004507 05006168 (05004548)
EG21AM 05004505 05006170 (05004550)
EGS21AM 05004504 05006172 (05004552)
EG21VM 05004508 05004508
EGS21VM 05004504 05004504

ES 2 T – 250/300 – 1/4

CAUTION: Certain danger to human safety and to equipment may occur if some

equipment is stopped without pre-warning. It is recommended that monitored
functions be limited to alarm-only or alarm before shutdown.

IMPORTANT: EG21 Series gage and EGS21 Series Swichgage Movement and Illumination require 12 VDC to function.

For 24 volts systems, voltage converters are built into the electrical wire / connector assembly and supplied with the instrument.
Specify voltage when ordering. No designator is required for sta

ndard configurations.

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Hangzhou, Zhejiang, 310018, China
Phone: [phone] Fax: [phone]

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Tulsa, Oklahoma 74147 USA
+1.918.317.4100 Fax: [phone]
E-mail: [e-mail]

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E-mail: [e-mail]

MURPHY POWER IGNITION

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Printed in U.S.A.