User Manual

65-2649RK-HC-04 M2A Tran smitter Op erator’s Manual 28
Chapter 7: Maintenance
Overview
This chapter describes pro cedures for performing prevent ive maintenance,
troubleshooting, calibrating the M2A, and replacing field replaceable parts.
Prevent ive Maintenance
This section describes a recommended preventive maintenance schedule to ensure the
optimum performance of the M2A. It includes daily, monthly, and biannual procedures.
Daily
Verify a d isplay reading of 0% L EL. Investigate significant changes in the reading.
Monthly
This procedure describes a test to verify that the M 2A responds properly to the target gas.
NOTE: Performing a response test on the M2A may cause alarms. If you do not want
external alarms t o actu at e, di sa ble an y external alarms duri ng t he r esponse test
to avoid unwant ed external alarm indicati on s .
NOTE: The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder and a fixed flow regulator with an on/ off knob.
1. Disable all external alarms if external alarm indications are not desired during the
response test.
2. Screw the calibration gas cylinder into the fixed flow regulator.
3. Use the flexible tubing coming from the calibration adapter/splash guard to connect
the regulator to the calibration adapter/splash guard.
4. Turn the regulator knob coun terclockwise to open the regulator.
5. Allow calibration gas to flow for the l ength of time determ ined in “Determining
Response Time” on page 31.
6. Ve ri fy that the display reading is within ± 20% of the gas concen tration.
NOTE: If the reading is not within ± 20% of the gas concentration, calibrate the M2A as
described in “Calibration” on page 32.
7. Turn the regulator knob clockwise to close the regulator.
8. Unscrew the calibratio n ga s cylinder from the fixed flow regulator.
9. Disconnect the calibration adapter/splash guard’s flexible tubing f rom the regulator.
NOTE: Do not disconnect the flexible tubing from the calibration adapt er/spla sh guard.