52
M2A Transmitter Operator’s Manual
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.
3. Connect the fixed flow regulator to the calibration cup using the sample tubing.
NOTE:
When calibrating an NH
3
ESM-01, the 0.25 LPM flowrate regulator must be used. All other M2As
require a 0.5 LPM flowrate regulator.
Adjusting the Fresh Air Reading
1. While in normal operation, press and hold the UP/YES button for 5 seconds to enter Calibration Mode.
Release the button when the following screen appears.
2. If you want to continue with calibration, press and release the UP/YES button. The display will indicate the
target gas and
CAL Mode
for a few seconds before showing
FreshAir Adjust?
.
If you want to exit Calibration Mode, press and release the DOWN/NO button. The M2A will indicate
Leaving CAL Mode
and the M2A will return to normal operation.
3. To continue with adjusting the fresh air reading, press and release the UP/YES button.
ENTER
will
alternate with
FreshAir
on the top display line and the current gas reading will be on the bottom display
line.
To skip adjusting the fresh air reading, press and release the DOWN/NO button. The display will indicate
SPAN w/Cal Gas?
. Skip to the next section, “Adjusting the Span Setting”.
4. Screw the zero air cylinder into the fixed flow regulator.
5. Turn the regulator knob counterclockwise to open the regulator.
6. Allow zero air to flow for two minutes. If there was gas present causing a reading on the M2A, the reading
should decrease and stabilize after two minutes.
7. Turn the regulator knob clockwise to close the regulator.
8. Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on the detector. The
M2A will continue to display the minimum gas response on the display and retain the response level in its
memory.
9. Press and release the ENTER button. The M2A will perform a fresh air adjustment and the display will
indicate
SPAN w/Cal Gas?
.
NOTE:
If the fresh air adjustment fails, see “Troubleshooting” on page 48 for recommended actions.
Adjusting the Span Setting
1. If you want to continue with adjusting the span setting, press and release the UP/YES button.
APPLY
will
alternate with
SPAN Gas
on the top display line and the current gas reading will be on the bottom display
line.
If you want to skip adjusting the span reading, press and release the DOWN/NO button. The display will
indicate
Leaving Cal Mode
and the M2A will return to normal operation.
Calib?
YES/NO
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