RKI Instruments M2A - Manual (Page 42)

37 M2A Transmitter Operator’s Manual
Chapter 7: Maintenance
Overview
This chapter describes procedures for performing preventive maintenance, troubleshooting,
calibrating the M2A, and replacing field replaceable parts. It includes separate procedures for
calibrating the combustible gas/CO
2
/toxic and oxygen versions of the M2A.
Preventive Maintenance
This section describes a recommended preventive maintenance schedule to ensure the optimum
performance of the M2A. It includes daily, monthly, quarterly, and biannual procedures.
Daily
Verify a display reading of zero (20.9% for an oxygen M2A). Investigate significant changes in the
reading.
Monthly
This procedure describes a test to verify that the M2A responds properly to the target gas.
NOTE: Performing a response test on the M2A may cause alarms. If you do not want external
alarms to actuate, disable any external alarms during the response test to avoid
unwanted external alarm indications.
NOTE: The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder, a 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.
1. Disable all external alarms if external alarm indications are not desired during the response
test.
2. Connect the calibration kit sample tubing to the calibration cup hose barb.
3. Screw the calibration cup onto the detector.
NOTE: For an ESM-01 detector, you must unscrew the removable splashguard from the
detector housing cap so you can push the appropriate calibration cup onto the ESM-01
sensor. Make sure to use the correct calibration cup for the sensor being used. There is a
Cl
2
type calibration cup for a Cl
2
sensor, an NH
3
type calibration cup for an NH
3
sensor, and a general type (usually labeled SO
2
) calibration cup for all other ESM-01
sensors.
4. Connect the fixed flow regulator to the calibration cup using the sample tubing.