Macurco CM-6 User instructions - page 15
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d. Detector has Alarm relay set to disable (OFF). Set Alarm relay to 100 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.
Testing the 4-20mA current loop
1. Connect the 200 ppm cylinder of carbon monoxide 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 sensor. Turn on the regulator to start the gas flow.
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 from 4mA in clean air to 20mA at 200 ppm. See 4-20 mA diagram on
page 6.
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 is in need of servicing (return unit to factory for servicing).
d. 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 CM-6 (make sure the LED is aligned with the front case
hole). You are done.
Aerosol Carbon Monoxide Test
The CME1-FTG is an 11L 500 ppm Aerosol Carbon Monoxide Field Test Gas that can be used with the CM-6.
This field test gas allows installers to do a quick functionality test of the CO sensor. The flow rate of the CME1-
FTG is 10 Lpm so you will have about a minute of gas or enough to test 20-30 sensors.
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 CM-6 status indicator light is illuminated, Green continuously. If not, do not proceed with
tests. See CM-6 Onboard Diagnostics section.
4. The display option should be set to “On” and reading 0 ppm in clean air.
5. With the CM-6 cover on, aim the nozzle of the aerosol can into the sensor grate area (under DO NOT
PAINT) and press for 2 to 3 seconds.
6. Wait for a few seconds. The digital display should climb indicating the increased CO concentration at the
sensor confirming a pass of the quick test.
Note: If the Display does not change within 10 seconds, there are four possibilities:
a. Gas cylinder is empty, replace the gas cylinder.
b. Unit needs to be re-calibrated (go through the Field Calibration Procedure and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
7. Wait for the display to return to 0 ppm and configure options to desired settings.