EGM-5 Operation Manual V. 1.04 82 support@ppsystems.com
2. The pressure regulator on the reference source should be set to a very low pressure, such that the
flow rate of excess gas from the open end of the T-fitting should be approximately 250 ml/min.
3. Select the button to the right of the “O2
Conc (ppm):” text. The numerical keypad will appear allowing
a new number to be entered.
4. Enter the O
2
concentration of the reference gas. This value must match the certified O
2
concentration
of the reference source and be greater than or equal to the anticipated measurement range of the
instrument.
5. The EGM-5 will then perform a zero. After completion of successful zero, a similar message to the
following will be displayed.
6. Note, the Actual displayed value may not be the value you entered in step 3 above. When the
Actual O
2
value has stabilized (i.e., not changing by more than 0.1% after seconds), press the OK
button. To cancel without performing a Calibration, press Stop.
The O
2
concentration Value entered at the beginning of the Calibration Process.
Returns to the Calibration Menu with no changes.
Calculates new Scale Factor and goes to next screen. Select this button when the
Actual O
2
value is steady (i.e., not changing by more than 0.1% after 30
If the process is successful, the screen below will be displayed and the new calibration and linearization
constants will be stored in non-volatile memory. If the process is unsuccessful, the message “Calibration:
failed(xx).” will be displayed, where xx is the error code. See EGM-5 Command Set Table on page 96 for
a description of calibration error codes.
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