61-1020/61-0230 Molecular Property Spectrometer
Calibration
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15
Calibration
This section describes how to calibrate the combustible gas detector. It includes procedures to
assemble the calibration kit, 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: During calibration, the detector must be calibrated with a cylinder of methane in a
background of real air containing argon and CO
2
. Only use the RKI-provided
calibration cylinder 81-9070RK-03.
NOTE: This manual assumes the MPS sensor is operating in a background of fresh air. If
the MPS sensor is not operating in a fresh air background, consult RKI
Instruments Inc. before calibrating the sensor.
Materials
Before calibration of the detector, the following items are required:
• a zero air calibration cylinder provided by RKI Instruments Inc.
• a CH
4
calibration cylinder (in a background of real air which contains argon and CO2)
• a 0.5 LPM fixed flow regulator with an on/off knob
• a calibration cup for the detector
• short piece of sample tubing to connect the regulator to the calibration cup
Preparing for Calibration
1. Screw the calibration cup onto the detector.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. 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.
