GasSens
Gas Detection System
Section 2 - A14 Receiver Module
O & M Manual
A14-RK, 8/06
2 - 11
Manual Auto-Test
Gas detection systems purchased with the optional Auto-Test generator may be tested by
manual activation of the generator from the receiver module. This function will operate only if the
Auto-Test configuration switch D1 is 'on'. As with the lamp test and alarm inhibit, access to
manual operation of the generator is through the
A/R
button.
Press and hold the button for approximately 5 seconds. The lamp test will occur first but
continue to hold the button down. When the lamps have shut off, release the button. The number
of hours since the last successful auto-test (automatic or manual) will appear on the display.
When the WARNING/ALARM flash is alternating with the TROUBLE flash, you can select manual
activation of the generator rather than relay inhibit. Press the
A/R
button when the TROUBLE
lamp is flashing (if a horn is connected, a quick beep will sound when the Auto-Test is selected).
The green gas indicator will begin to flash, indicating that the generator is activated. The system
will go through a normal Auto-Test sequence, exactly the same as the sequence used every 24
hours. If you observe the display, you will see increasing gas values as the sensor begins to
respond. Upon completion of a successful test, the horn will sound a single beep. The inhibit will
remain on for an additional 10 minutes while the sensor recovers to zero. Should the test be
unsuccessful, the TROUBLE lamp will light and the alarm relay and horn will activate. Pressing
the
A/R
button will silence the horn, but the alarm cannot be reset for at least 10 minutes after a
failure of the manually activated Auto-Test. This period will allow time to manually inspect the
sensor to determine the reason for the failure
If the manual Auto-Test sequence results in a trouble alarm, check the sensor/transmitter.
Either the sensor or generator has failed, or the diffusion path between the two is physically
blocked. Methods for testing individual gas sensors can be found in specific sensor/transmitter
instructions.
Remote Reset
Receivers are provided with input terminals for connection of a remote reset switch. The
remote reset input provides horn silence and alarm reset functions using a switch located at a
remote point. When receivers are located at sites with telemetry equipment, the remote reset
input may be connected to a relay contact in the telemetry system.
The remote reset input accomplishes the same acknowledge and reset functions as the
A/R
button on the front panel. When a switch closure is detected across the remote reset terminals,
the detector horn will silence and any latching relays will reset, provided that the gas condition has
cleared. The remote reset input will not activate any of the testing or inhibit functions of the
receiver.
Analog Output
Receivers provide an isolated 4-20 mA output signal for interface with recorders, data loggers,
or computer systems. The span of the 4-20 mA signal is the same as the range of the receiver
selected during the receiver configuration. The output will drive loads up to 1200 ohms.
