Calibration – RKI Instruments 61-1000RK User Manual
Page 14
10 • 61-1000RK Combustible Gas Detector
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
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.
Setting the Zero Reading
CAUTION:
If you suspect the monitoring environment is not free of combustible vapors, use the
calibration kit and a zero air calibration cylinder to introduce “fresh air” to the
detector and verify an accurate zero setting.
1.
Verify that the detector is in a fresh air environment.
2.
Follow the directions in the controller’s operator’s manual for setting the zero
reading.
Setting the Response Reading
1.
Follow the directions in the controller’s 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 the gas to flow for one minute before continuing with the directions.