Macurco TX-6-ND User Instructions page 20

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-6-ND will show the current concentration of gas or "0.0" (zero) in clean air. When
the gas concentration reaches the Fan Relay setting (1.0 ppm, for example) the display will flash back and forth between "FAn"
and "1". 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 four 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 (OFF). 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.
f. 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 5 ppm cylinder of Nitrogen Dioxide to the regulator.
2. Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
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