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Installation 00-02-0268 page 1 of 2
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Designed for Use with Electric Swichgage instruments
or Normally Open, Close to Negative Contacts
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LED Annunciation for Low Oil Pressure,
High Water Temperature, Loss of Battery Voltage,
and Low Fuel Level or Glow Plug.
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Output may be used for Tripping an Electromagnetic
Control Switch for Engine Shutdown
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Developed with the Same Leading Edge Technology
as Our EGS Series Electric Swichgage
Description
Murphy’s EN204 Tattletale Annunciator
works with other engine components to
clearly indicate critical engine operating
conditions. The four bright LEDs on the
face of the Annunciator indicate the cause
of an alarm or shutdown condition.
Two EN204 models are available. Each
shows the standard critical engine operating
parameters—oil pressure, coolant tempera-
ture, and battery voltage. Model EN204-S-
12 also includes an indicator for low fuel
level. Model EN204-SG-12 substitutes the
fuel level indicator with a glow plug indica-
tor for those engines that use a glow plug
for easier starting.
The EN204 Annunciators are used in con-
junction with Murphy Electric Swichgage
instrument or other normally open switches
that close to ground when a fault condition
occurs. As an example, in a system with a
Murphy EGS21P-100 Oil Pressure
Swichgage instrument, the Swichgage clos-
es to ground when the oil pressure drops
below a pre-determined set point. This will
energize the Oil Pressure LED on the
EN204 to highlight a low oil pressure fail-
ure.
A very important feature of the EN204 is the
ability to interface with Murphy 518PH or the
760A Electromagnetic Switches to perform
automatic engine shutdown when fault condi-
tions occur. The EN204 can also be used with
other Murphy visual and audible alarms
(STAS series remote alarm, SAH audible
alarm, and the TL7 visual alarm) for remote
annunciation and equipment shutdown.
Basic Models
The following two basic models are offered:
The Switched functions listed above are able
to sink a current up to 0.275 amps and may
be used to activate the electromechanical
control switches or other devices.
Specifications
Operating Voltage:
12 VDC (10 V min. - 16 V max.).
Current: 0.020 A to 0.025 A per LED.
Output: Sink 0.275 A.
Output Saturation Voltage:
.7-1.1 V @ 25°C.
Case and Screw-on Mounting Clamp:
Polyester (PBT).
Bezel: Bright stainless steel.
Lens: Clear Polycarbonate, UV stabilized.
Dial: Black background and white markings
with four (4) Red LED indicators.
Wiring: Plug connector with wire leads,
18 AWG (1.0 mm
2
) x 8 in. (203 mm) long.
Operating Temperature:
-40 to 185°F (-40 to +85°C).
Storage Temperature:
-76 to 185°F (-60 to 85°C).
Shipping Weight: 0.5 lb. (226 g).
Shipping Dimensions: 8 x 4 x 4-1/2 in. (203
x 102 x 114 mm).
How to Order
EN204-S-12 Four-LED Tattletale annunciator
and switch including Fuel Level LED
indicator.
EN204-SG-12 Four-LED Tattletale annunciator
including Glow Plug LED
indicator.
EN204 Series
Monitored
Functions
Oil Pressure
Coolant
Temperature
Fuel Level
Battery
Voltage
Indicate and
Switched
Indicate and
Switched
Indicate and
Switched
Indicate
Oil Pressure
Coolant
Temperature
Glow Plug
Energized
Battery
Voltage
Indicate and
Switched
Indicate and
Switched
Indicate
Indicate
Action
Monitored
Functions
Action
EN204-S-12 EN204-SG-12
00-02-0268
Revised 03-06
Catalog Section 70
Four-Function
Tattletale
®
Annunciator