Macurco CM-6 Manuel page 30

Macurco CM-6/CM-12 Manual (Rev-1.1) Eng
CM-xx has "CAL" top level menu that can be used to perform field calibration. 'tSC', 'Spn' and 'End' are sub-menu within "CAL"
menu. 'tSC' is read only menu and represents the time since last calibration. If you enter this sub-menu, it will display value in
format Y.MM. "MM" are for months and "Y" for year. E.g. if the value is 0.05 then it has been 5 months since the unit was last
calibrated. 'Spn' sub-menu is used during field calibration procedure as described in following procedure. 'End' sub-menu is
used to exit out of 'CAL' menu.
Follow the procedure below for field calibration.
a. Remove the Philips screw on the front of the CM-xx. Pull the front cover of the unit off.
b. Assemble the 200-ppm gas cylinder and regulator together.
c. Check the pressure gauge on the regulator. If you have 25-psi or less you will need to replace the gas canister.
d. Place the test Hood from the regulator over the CO sensor.
e. Push Next 3 times to get to the CAL menu then push Enter. It will display "tSC". Push Next to go to "Spn" and push
Enter. The display will flash back and forth between GAS and 200.
f. Start applying gas to the CO sensor.
Note: The sensor will look for the gas for 90 seconds. If no gas is applied or detected in that time, the display will return
to CAL.
g. When the sensor detects the gas, the display will flash back and forth between the CO concentration and SPn, then the
calibration will progress, and the display will show the gas level for a maximum of 165 seconds.
h. When the calibration is successful, the display will flash back and forth between CO concentration and PAS, then the
display will show the calibration gas level and the calibration is done.
i. If the calibration fails, the display will flash back and forth between the CO concentration and "FAil". If this occurs,
check the pressure gauge on the regulator. If the pressure is less than 25 psi the flow of gas may not be adequate to
properly calibrate the unit. If there is proper pressure in the cylinder repeat steps 4 through 6. If the unit fails to
calibrate twice contact Technical Support: 1-844-325-3050.
j. Once the calibration has passed, remove gas and disassemble the cylinder and regulator.
k. Re-assemble the CM-xx (make sure the LED is aligned with the front case hole). You are done.
l. See Calibration Flowchart on the inside of the housing.
REV – 1.1 [34-2900-0511-6]
30 |
P a g e