GE XMO2, User Manual

Page: 50 / 196

September 2007
4-8 Field Calibration
Span Gas Pushbutton
Calibration
To perform a span gas pushbutton field calibration, complete the
following steps:
1. Using the sample system controls, stop the flow of sample gas to
the XMO2 inlet port and initiate a flow of the same span gas
specified on the XMO2 Calibration Sheet. Establish the same flow
rate and pressure conditions used for the sample gas, and allow the
span gas to flow through the XMO2 for at least three minutes.
2. Using Figure 4-2 on page 4-4 as a guide, locate the Zero/Span
Selector (Switch S1). Set the Zero/Span Selector (Switch S1) to
position “3" (“Span”).
3. Using Figure 4-2 on page 4-4 as a guide, locate the Calibration
Pushbutton (Switch S3). Depress the Calibration Pushbutton and
hold it down for 20 seconds. During this time, the green light
below the
Calibration Pushbutton will go out.
4. When the Calibration Pushbutton is released, the green light will
come back on and the XMO2 has been recalibrated.
You may now return the XMO2 to normal operation by using the
sample system controls to stop the span gas flow and restart the flow
of sample gas.
Note:
After performing a two-gas field calibration, you should
return the XMO2 to one-gas calibration mode. See Chapter 6,
General Programming , for instructions.
Two-Gas RS232
Communication
Calibration
To perform a two-gas RS232 communication field calibration,
complete the following steps:
1. Using the sample system controls, stop the flow of sample gas to
the XMO2 inlet port and initiate a flow of the same zero gas
specified on the XMO2 Calibration Sheet. Establish the same flow
rate and pressure conditions used for the sample gas, and allow the
zero gas to flow through the XMO2 for at least three minutes.
2. Perform the zero gas calibration as follows:
BASIC MENU
Press
[Y]
or
[Enter]
to initiate the
zero gas calibration.
Quick Zero?
BASIC MENU
This screen appears while the
calibration is taking place.
DriftCal In Progress...
BASIC MENU
Press [N] to go to the next Basic
Menu option.
Quick Zero?