Murphy Switch BN204 Series User Manual

00-02-0268  
Revised 03-06  
Four-Function  
Tattletale® Annunciator  
Catalog Section 70  
EN204 Series  
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.  
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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