00-02-0268
Revised 03-06
Four-Function
Tattletale® Annunciator
Catalog Section 70
EN204 Series
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Designed for Use with Electric Swichgage instruments
or Normally Open, Close to Negative Contacts
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
Developed with the Same Leading Edge Technology
as Our EGS Series Electric Swichgage
Description
Specifications
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.
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.
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:
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.
Polyester (PBT).
Bezel: Bright stainless steel.
Lens: Clear Polycarbonate, UV stabilized.
Basic Models
Dial: Black background and white markings
EN204-S-12
EN204-SG-12
with four (4) Red LED indicators.
Monitored
Monitored
Action
Action
Wiring: Plug connector with wire leads,
Functions
Oil Pressure
Coolant
Functions
2
18 AWG (1.0 mm ) x 8 in. (203 mm) long.
Indicate and
Switched
Indicate and
Switched
Oil Pressure
Operating Temperature:
-40 to 185°F (-40 to +85°C).
Indicate and
Coolant
Indicate and
Switched
Temperature Switched
Temperature
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.
Storage Temperature:
Battery
Indicate
Voltage
Battery
Voltage
Indicate
Indicate
-76 to 185°F (-60 to 85°C).
Indicate and
Fuel Level
Glow Plug
Energized
Shipping Weight: 0.5 lb. (226 g).
Switched
Shipping Dimensions: 8 x 4 x 4-1/2 in. (203
The following two basic models are offered:
x 102 x 114 mm).
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.
How to Order
EN204-S-12
Four-LED Tattletale annunciator
including Fuel Level LED
indicator.
and switch
EN204-SG-12
Four-LED Tattletale annunciator
including Glow Plug LED
indicator.
Installation 00-02-0268 page 1 of 2
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