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Zero Calibration
The instrument should be zero calibrated in clean ambient air with 20.9% oxygen. A zero
calibration should precede a span calibration.
Changing Span Value
Use this function to change the gas concentration to be used for bump testing or span
calibration.
Note: If the sensor calibration fails, try again. If calibration fails repeatedly, the sensor(s)
should be replaced. Replace the sensor.
WARNING: Do not replace sensors in hazardous locations.
Battery Replacement
A Li-ion battery pack (PN: G02-3004-000) is supplied with each PGM-25XX/D.
To replace a PGM-25XX/D battery pack, unscrew the two screws on the battery cover,
and then remove the battery cover. After installing a new battery pack, reinstall the
battery cover and the two screws.
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