Macurco CD-6B Manual (Rev-1.0) Eng
REV – 1.0 [34-2900-0510-2 ] 28 | Page
b. The gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
c. Unit needs to be re-calibrated (automated background calibration or manual calibration and re-
test).
d. The detector needs servicing (return unit to the factory for servicing).
6. Remove the gas from the sensor and replace the top cover.
7.3.2 Aerosol Test
Macurco does not currently have an aerosol option for testing the CD-6B.
7.4 Field Calibration
If automated background calibration is disabled, a periodic manual field calibration will be required. The CD-6B has a
top-level menu “CAL” that can be used to perform a field calibration.
NOTE: The “CAL” menu is not available when “Abc” is turned “On”.
7.4.1 Field Calibration Procedure
For optimum calibration results the unit should be in clean air and be in a low ambient air flow.
To perform a field calibration,
1. Remove the Philips screw on the front of the CD-6B. Remove the front cover.
2. Open the Field Calibration Kit. 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
P
2
P sensor.
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.
7. Press the ENTER/TEST button.
8. The display will show “tSC” (if automated background calibration “Abc” is turned OFF). Press MENU/NEXT to
go to “Spn”.
9. Press ENTER/TEST.
10. Calibration starts and the following sequence will be observed:
a. c119 and 0.04 flashing and green LED blinking, where the value after c decreases by 2 with every
flash
b. After c90 it will flash between current gas reading and c90, where the value after c decreases by 2
every flash
c. After 2 minutes, the display will count down showing “CAL7”, “CAL6”, “CAL5”, “CAL4”, “CAL3”,
“CAL2”, “CAL1”.
d. The display will show “PASS” alternating with “0.04” after successful field calibration.
e. Green LED flashes for another 1 minute.
f. When green LED is solid, the LED display also goes back to normal displaying the current gas reading.
11. If the calibration fails, the display will flash between “gas reading” and “FAil” for 30 seconds.
NOTE: The “bad calibration” error code will only be cleared by a successful calibration of the sensor.
If calibration failure occurs, check the pressure gauge on the regulator. If the pressure is less than 25 psi, the
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