RKI Instruments M2 Series - Manual (Page 41)

M2 Transmitter Operator’s Manual 36
Chapter 7: Maintenance
Overview
This chapter describes procedures for performing preventive maintenance,
troubleshooting, calibrating the M2, and replacing field replaceable parts. It includes
separate procedures for calibrating the combustible gas/CO
2
/toxic and oxygen versions
of the M2.
Preventive Maintenance
This section describes a recommended preventive maintenance schedule to ensure the
optimum performance of the M2. It includes daily, monthly, and quarterly procedures.
Daily
Verify a display reading of zero (20.9% for an oxygen M2). Investigate significant changes
in the reading.
Monthly
This procedure describes a test to verify that the M2 responds properly to the target gas.
NOTE: Performing a response test on the M2 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.