3 95-85561.1
Characteristic Transmitter (Tx) Receiver (Rx)
Functional Description Contains primary and backup xenon
flashlamps, and generates optical ener-
gy to enable hydrocarbon detection.
Contains opto-electronics, signal pro-
cessing and output drivers, and diagnos-
tic electronics.
Power Consumption 6.0 watts nominal @ 24 Vdc.
12.2 watts peak @ 24 Vdc.
6.0 watts nominal @ 24 Vdc.
12.2 watts peak @ 24 Vdc.
Electrical Connections 2 power connections only.
(+24 Vdc and –24 Vdc).
From 3-7 connections depending upon
specific configuration (separate power
and signal cables recommended).
Onboard HART Communication Port Factory use only. Recommended for connection to hand-
held HC275/375 HART communicator
for system setup, commissioning, and
diagnostics.
Onboard LED Indicator Indicates normal, fault, and backup lamp
operation status.
Green indicates normal operation.
Red indicates fault condition.
Amber indicates operation in “back-up
lamp” mode.
Indicates normal, alarm, fault, and cali-
bration status.
Green indicates normal operation.
Blinking red indicates low gas alarm con-
dition.
Steady red indicates high gas alarm con-
dition.
Amber indicates operation in “back-up
lamp” mode or system fault.
Calibration status is indicated by a
steady red indication after Calibration
command.
LED operation for fault status is non-
latching. LED operation for gas alarms
is configurable for latching/non-latching.
Magnetic Calibration Switch
(See Figure 1 for switch location.)
Non-functional Momentary activation provides reset
function for latched alarm outputs.
Activation for longer than 2 seconds will
initiate calibration.
Factory Default Settings No programmable options Factory calibrated for methane, 0-5 LEL-
meters full scale. See Table 2 for
receiver factory default settings. HART
communication is required to change the
factory default settings.
Table 1—Functional and Electrical Comparison of Transmitter and Receiver
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