Macurco TX-12-HS Instructions D'utilisation page 21

5. Turn on the regulator to start the gas flow and wait with the gas applied continuously.
6. With the display function turned "On", the TX-12-HS will show the current concentration of gas or "0" (zero) in clean air. When
the gas concentration reaches the Fan Relay setting (8 ppm, for example) the display will flash back and forth between "FAn"
and "8". With the display function turned "OFF", the display does not show the gas concentration, but will show "FAn" as long
as the fan relay is activated.
Note: If the Fan relay does not close within 2 minutes, there are five possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi 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 fan relay set to disable (diS). Set fan relay to 3 ppm and repeat the test.
e. Detector has fan relay delay set to 3 minutes. Set fan relay to 0 minutes and repeat the test.
7. Remove the gas from the sensor. Proceed to Test the Alarm relay or replace the top cover. Fan relay test is complete.
Testing the Alarm Relay
Note: The gas concentration to activate the Alarm relay depends on the setting.
1. Connect the 25 ppm cylinder of Hydrogen Sulfide to the regulator.
2. Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
3. Place the test hood over the gas sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
5. With the display function turned "On" and the gas concentration reaching the Alarm Relay setting, (20 ppm, 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, there are four 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 (diS) or higher than 20 ppm. Set Alarm relay to 20 ppm and repeat the
test.
6. Remove the gas from the sensor after Test. Proceed to Test the 4-20mA output or replace the top cover. Alarm relay test is
complete.
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