RKI Instruments 65-2438 User Manual
Page 15
65-2438 CO Detector • 11
Preparing for Calibration
NOTE:
Calibrating the CO detector may cause alarms. Be sure to put the controller into
its calibration program or disable external alarms before calibrating.
WARNING: Do not remove the detector housing cap while the circuits are energized
unless the area is determined to be non-hazardous. Keep the detector
housing cap tightly closed during operation.
1.
Screw the calibration cup onto the bottom of the CO detector.
2.
Screw the regulator into the calibration cylinder.
3.
Use the calibration kit sample tubing to connect the fixed flow regulator to the
calibration cup.
4.
Put the controller into its calibration program.
Setting the Zero Reading
NOTE:
If you can verify that the CO detector is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the zero reading.
1.
Follow the directions in the controller operator’s manual for setting the zero reading.
2.
When the instructions call for applying zero air to the detector, turn the regulator’s
on/off knob counterclockwise to open it.
3.
Allow the gas to flow for two minutes.
4.
Set the zero reading according to the controller operator’s manual.
5.
Turn the regulator’s on/off knob clockwise to close it.
6.
Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1.
Follow the directions in the controller operator’s manual for setting the response
reading (span).
2.
When the directions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it.
3.
Allow gas to flow for 2 minutes before continuing with the directions.
4.
After setting the response reading, turn the regulator’s on/off knob clockwise to close
it.
5.
Unscrew the regulator from the cylinder.
6.
Remove the calibration cup from the detector.
NOTE:
For convenience, leave regulator and calibration cup connected by the sample
tubing.
7.
Allow about 45 seconds for the gas reading to decrease below the alarm points and
then return the controller to normal operation.