Testing The 4-20Ma Loop; Aerosol Test; Field Calibration Procedure; Cd-Xxh - Macurco CD-6H Manuel D'instructions

Macurco CD-xx H/MC Manual
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 is in need of 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.

7.3.3 Testing the 4-20mA loop

1. Connect the 5000 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 5000 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 is in need of 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-xxH/MC (make sure the LED is aligned with the front case hole).
You are done.

7.3.4 Aerosol Test

Macurco does not have an Aerosol Option for testing the CD-xxH/MC at this time.

7.4 Field Calibration Procedure

7.4.1 CD-xxH

The CD-6H uses an automated background calibration program to set the clean air level on a regular basis. The CD-xxH does not
have the option for performing a calibration.

7.4.2 CD-xxMC

N ote : For optimum calibration results the unit should be in clean air and be in a low ambient air flow.
4 2 T 4 2 T
1. Remove the Philips screw on the front of the CD-6MC. Remove the front cover.
2. Open the FCK. Connect the 400 ppm carbon dioxide gas cylinder to the regulator.
3. Check the pressure gauge on the regulator. If you have 25-psi or less, you will need to replace the gas canister. Check
the expiration date on the cylinder, if it has passed the expiration date the cylinder should be replaced.
4. Assemble regulator, hose, and Calibration Hood and place the hood over the CO
5. Turn on the regulator to start the gas flow and wait with the gas applied continuously.
6. On the detector press the Menu / Next button three times to get to the CAL menu. Press Enter / Test button
7. The display will alternate between "GAS.S" and "400" for 60 seconds.
8. The display will then show "Spn.4" alternating with the "current gas reading" for 60 seconds.
9. The display will then show "Spn.3" alternating with the "current gas reading" for 60 seconds.
10. The display will then show "Spn.2" alternating with the "current gas reading" for 60 seconds.
11. The display will then show "Spn.1" alternating with the "current gas reading" for 60 seconds.
12. The display will then show "CAL7, CAL6, CAL5, CAL4, CAL3, CAL2, CAL1, then CAL0" counting down.
13. The display will show "PASS" alternating with "400" for about 30 seconds before changing back to CAL and Current gas
reading after 30 seconds.
REV – 1.2
sensor. Turn on the regulator to start the gas flow.
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