9
CO Sensor Calibration
Required parts:
Zero gas (20.9% O2)
Span gas (250 PPM CO)
3/16” I.D. rubber hose
3LPM regulator
UP99 Universal IR programmer
These parts are included in the P1879-CO-250-NC-3 Calibration Kit.
To calibrate the sensor the panel door must be opened so the user can view the LCD display on the
Universal Transmitter and the adjustable flow regulator.
The UP99 Universal Programmer is used to put the Universal Transmitter into Calibration mode. To do so
point the programmer at the infrared sensor on the top of the Universal Transmitter, then the unlock code
must be entered. To unlock the Universal Transmitter press 25 (the unlock code will not be displayed on
the screen) then press enter (E) on the programmer. Next enter the password which is factory defaulted to
1 then press enter (E). When the monitor is unlocked enter 111 then press enter to access calibration
mode. When in calibration the PLC will shut off the pump so it does not interfere with the calibration. The
Universal Transmitter interface is also explained in the Universal Transmitter Manual.
Once in Calibration mode turn the handle of the ball valve on the right side of the enclosure to the upward
position and connect the 3/16” I.D. hose from the 3LPM regulator on the “zero gas” cylinder to the
calibration port on the right side of the enclosure. The status light on the bottom of the Universal
Transmitter will turn green when in calibration mode indicating that the zero gas should be applied to the
sensor. Open the valve on the regulator and apply the zero gas.
Make sure that the adjustable flow regulator inside the panel is fully open to allow maximum flow. Apply
the zero gas for two minutes. After two minutes or a stabilized reading, point the IR programmer at the
Universal Transmitter and press enter. The status light will now turn red indicating the monitor is ready to
have the “span gas” applied. Remove the zero gas and apply the span gas for two minutes.
Notice the LPM level on the flow regulator; it should be approximately 3 LPM. The sample flow rate will
have to be adjusted to match this flow for the most accurate sampling possible. After two minutes or a
stabilized reading, point the IR programmer at the Universal Transmitter and press enter. The monitor will
display if the calibration has passed or failed and go into standby mode for 60 seconds to allow the PPM
level to drop to avoid false alarms.
Immediately after you have finished the span gas calibration, while the monitor displays either “Cal Pass” or
“Cal Fail” quickly turn off and remove the span gas and turn the handle of the ball valve back to sample
mode. The PLC will automatically enter startup mode and turn the pump back on while the monitor is in
standby mode to lower the gas value.
At this point the adjustable flow regulator will need to be adjusted to match the 3LPM flow rate that the
sensor was calibrated at.
When the sample panel is in calibration mode the pump is turned off and all activities such as high pressure
blow back and low flow blow back are disabled. The Universal Transmitter calibration is also explained in
the Universal Transmitter Manual.
