Testing The Alarm Relay; Testing The 4-20Ma Loop - Macurco CX-6 Instrucciones Para El Usuario

Macurco CX-xx Operation Manual
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 needs servicing (return unit to factory for servicing).
d. The detector has the Fan Relay set to disable ("diS") or a concentration level higher than the test
gas. Set the Fan Relay to a gas concentration lower than the test gas and repeat the test.
7. Remove the gas from the sensor. Proceed to test the Alarm Relay or replace the top cover.

7.3.2 Testing the Alarm Relay

1. Connect the gas cylinder to the regulator.
2. Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
3. Place the Calibration Hood over the sensor.
4. Turn on the regulator to start the gas flow. The Alarm Relay should activate according to the settings.
5. With the display function turned "On" and the gas concentration reaching the Alarm Relay setting, the
display will flash between "ALr" and "current gas reading". 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 needs servicing (return unit to factory for servicing).
d. The detector has the Alarm Relay set to disable ("diS") or a concentration level higher than the test
gas. Set the Alarm Relay to a gas concentration lower than the test gas 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.

7.3.3 Testing the 4-20mA loop

1. Make sure the 4-20mA mode is set to "HigH" for this test.
2. Connect the gas cylinder to the regulator.
3. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.
4. Place the cap from the regulator over the sensor. Turn on the regulator to start the gas flow.
5. The Fan relay should activate according to the settings.
6. The Alarm relay should activate according to the settings.
7. The 4-20mA output should ramp up from 4mA in clean air to 20mA at 200 ppm CO and 20mA at 20 ppm
NO . See Figure 3–1 and Figure 3–2.
2
Note: If the 4-20mA output does not ramp up 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 needs servicing (return unit to factory for servicing).
d. Detector has 4-20 mA option set to "OFF". Set 4-20mA option to "bAS" and repeat the test.
8. Remove the gas from the sensor. Re-assemble the CX-xx (make sure the LED is aligned with the front case
hole). You are done.
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