RKI Instruments M2 Series - Manual (Page 42)

37 M2 Transmitter Operator’s Manual
NOTE: When applying gas to an NH
3
ESM-01, the 0.25 LPM flowrate regulator must
be used. All other M2s require a 0.5 LPM flowrate regulator.
5. Screw the calibration gas cylinder into (onto for an H
2
S cylinder) the fixed flow
regulator.
6. Turn the regulator knob counterclockwise to open the regulator.
7. Allow calibration gas to flow for one minute.
8. Verify that the display reading is within ± 20% of the gas concentration.
NOTE: If the reading is not within ± 20% of the gas concentration, calibrate the M2 as
described in “Calibration, Combustible Gas, CO2, and Toxic Versions” on
page 40 or “Calibration, Oxygen Version” on page 43.
9. Turn the regulator knob clockwise to close the regulator.
10. Unscrew the calibration gas cylinder from the fixed flow regulator and unscrew the
calibration cup from the detector.
For an ESM-01 detector, pull the calibration cup off the ESM-01 sensor and screw the
splashguard back onto the detector housing cap.
11. If external alarms have been disabled, enable them when the display returns to a
normal fresh air reading.
12. Store the components of the calibration kit in a safe place.
Quarterly
Calibrate M2s that do not have an IR detector as described in “Calibration, Combustible
Gas, CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43.
See “Calibration Frequency” on page 40 for a discussion of calibration frequency
guidelines.
Biannually
Calibrate M2s that have an IR detector as described in “Calibration, Combustible Gas,
CO2, and Toxic Versions” on page 40. See “Calibration Frequency” on page 40 for a
discussion of calibration frequency guidelines.