Testing The 4-20Ma Loop; Aerosol Test - Macurco CD-6G Manual De Operación

Macurco CD-6G Operation Manual
Note: If the Alarm relay fails to operate within 2 minutes, there are four possibilities:
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a. The gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (automated background calibration and re-test).
c. The detector needs servicing (return unit to the factory for servicing).
d. The detector has Alarm relay set to disable (diS). Set Alarm relay to 4000 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.

6.5.3 Testing the 4-20mA loop

1. Connect the 5%-ppm cylinder of carbon dioxide to the regulator.
2. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.
3. Place the cap from the regulator over the CO
4. The Fan relay should activate according to the settings.
5. The Alarm relay should activate according to the settings.
6. The 4-20 mA output should ramp up to output 20 mA at 5% ppm. See 4-20 mA diagram.
Note: If the 4-20mA output does not ramp up within 2 minutes, there are four possibilities:
a. The gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (automated background calibration and re-test).
c. The detector needs servicing (return unit to the factory for servicing).
d. The detector has 4-20 mA option set to "OFF". Set 4-20mA option to "On" and repeat the test.
7. Remove the gas from the sensor. Re-assemble the CD-6G (make sure the LED is aligned with the front case hole). You
are done.

6.5.4 Aerosol Test

Macurco does not have an Aerosol Option for testing the CD-6G currently.
REV – 1.0
sensor. Turn on the regulator to start the gas flow.
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