User Instructions

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4. With the display function turned “On” and the gas concentration reaching the Alarm Relay setting, (20% LEL, for example) the
display will flash back and forth between “ALr” and “20”. The buzzer will sound indicating “Alarm” if the buzzer is turned “On”.
With the display function turned off the display does not show the gas concentration, but will show “ALr” when the Alarm relay
is activated.
Note: If the Alarm relay fails to operate within 2 minutes, consider these possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has Alarm relay set to disable (OFF). Set Alarm relay to 20% LEL and repeat the test.
5. Remove the gas from the sensor after test. Proceed to test the 4-20 mA output or replace the top cover.
Testing the 4-20 mA current loop
Connect the 20% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration matches the gas selected
in the GD-6 configuration.
1. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.
2. Place the test hood from the regulator over the gas sensor. Turn on the regulator to start the gas flow.
3. The fan relay should activate according to the settings.
4. The alarm relay should activate according to the settings.
5. The 4-20 mA output should ramp up from 4mA in clean air to 20 mA at 50% LEL. See 4-20 mA diagram in these User
Instructions.
Note: If the 4-20mA output does not ramp up within 2 minutes, consider these possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has 4-20 mA option set to “OFF”. Set 4-20 mA option to “On” and repeat the test.
6. Remove the gas from the sensor. Re-assemble the GD-6 (make sure the LED is aligned with the hole on the front of the case).
Quick Gas Test
A butane cigarette lighter can be used to perform a functionality test of the GD-6. This test allows installers to do a quick functionality
test of the gas sensor.
1. Units to be tested must be powered continuously for a minimum of 3 minutes before proceeding.
2. For optimum test results, the unit should be in clean air and be in a low ambient air flow.
3. Check that the GD-6 status indicator light is illuminated, green continuously. If not, do not proceed with tests. See GD-6
Trouble Indicator section in these User Instructions.