61-1000RK-05/61-0140RK-05 Combustible Gas Detector • 13
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for most combustible gas detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where combustible gas 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 combustible gas is present often and in
significant concentrations or the environment is not well controlled, then more frequent
calibration than every 3 months may be necessary. If potential catalyst poisons are known
or likely to be present, more frequent calibration than every 3 months will be necessary.
Calibration
This section describes how to calibrate the combustible gas detector. It includes
procedures to prepare for calibration, set the zero reading, set the response reading, and
return to normal operation.
WARNING: The controller is not an active gas monitoring device during the calibration
procedure.
NOTE:
The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder, a 0.5 LPM fixed flow regulator with an on/off knob, a
calibration cup for the detector, and a short piece of sample tubing to connect the
regulator to the calibration cup.
Preparing for Calibration
WARNING: Do not remove the junction box cover while the circuits are energized
unless the area is determined to be non-hazardous. Keep the junction box
cover tightly closed during operation.
1.
Screw the calibration cup onto the bottom of the detector.
2.
Screw the regulator into the calibration cylinder.
3.
Use the calibration kit sample tubing to connect the regulator to the calibration cup.
4.
Place the controller into its calibration program or disable external alarms.
NOTE:
Calibrating the combustible detector may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
