RKI Instruments 65-2437RK-05 - Manual (Page 16)

12 • 65-2437RK-05 CO Detector
Calibration
This section describes how to calibrate the CO detector. It includes procedures to prepare
for calibration, set the zero reading, set the response reading, and return to normal
operation. It describes calibration using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
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 zero air 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. Unscrew the regulator from the zero air calibration cylinder.
7. Leave the sample tubing connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the CO gas cylinder. If necessary
to fit the CO calibration gas cylinder, change the regulator.
Setting the Response Reading
1. Screw the regulator into the calibration gas cylinder.
2. Follow the directions in the controller operator’s manual for setting the response
reading (span).