RKI Instruments 65-2499RK - Manual (Page 17)

65-2496RK/65-2499RK CO Detector • 13
8. If the detector is installed remotely from a controller in a junction box, reinstall the
junction box cover.
9. Turn on or plug in power to the controller.
10. Turn on the controller.
CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with
the next step.
11. Calibrate the replacement detector as described in “Calibration” on page 13.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most CO detector applications.
Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months for the CO detector.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where CO is not normally present, and calibration adjustments
are minimal at calibration, then a calibration frequency of every 6 months is adequate.
If an application is very demanding, for example if the environment is not well controlled
or if CO is often present, then more frequent calibration than every 3 months may be
necessary.
Calibration
This section describes how to calibrate the CO detector. It includes procedures to prepare
for calibration, set the fresh air 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.
WARNING: Not using the recommended calibration cup and sample flowrate will
result in an inaccurate calibration. See“Parts List” on page 15 for the
required calibration cup and regulator.
Preparing for Calibration
1. Screw the calibration cup onto the bottom of the CO detector.
2. Screw the regulator into the zero air calibration cylinder. Make sure the regulator is
off. It is off when the on/off knob is turned all the way clockwise.
3. Use the sample tubing to connect the regulator to the calibration cup.
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 fresh air reading.
4. Put the controller into its calibration program. See the controller operator’s manual
for instructions to enter the calibration program.