EGM-5 Operation Manual V. 1.04 78 support@ppsystems.com
CO2
This menu allows the user to recalibrate the CO2 gas analyzer. Before proceeding with an instrument
recalibration, it is critical that:
• The absorber column is properly seated in its manifold
• The soda lime (CO
2
scrubber) is fresh.
• The EGM-5 has been on for at least 30 minutes.
• The Gas Out port is unobstructed.
2
concentration (ppm) of the calibration reference gas.
Entering a value will begin the calibration process
The current CO2 Reading based on the Scale Factor
The current Scale Factor being used
Returns to the Calibration Menu.
Connecting Calibration Gas to the EGM-5
During calibration, the signal from the CO
2
detector is referenced against a gas of known CO
2
concentration. The EGM-5 calibration procedure uses two reference points:
1. Zero CO
2
, generated from air that has been scrubbed of CO
2
through the soda lime in the
absorber column.
2. Span (reference) gas, a user-provided gas with a known CO
2
concentration, typically from a very
accurate (+/- 1%) certified source.
It is vital that both of these references are accurate. For greater accuracy, cylinder mixtures should be
traceable to NIST (National Institute of Standards and Technology) standards. The zero gas will only be
accurate if the soda lime in the absorber column is fresh.
Assuming that a calibration gas mixture is used to calibrate the EGM-5, follow these instructions:
1. To avoid excess pressure in the sample cell and possible damage to the analyzer, you must place a
T-fitting between the reference gas source and the GAS IN port on the EGM-5. One end of the T-
fitting should be left open in order to relieve excess pressure, as follows:
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