Startup & Operation 3-7
September 2007
RS232 Digital
Communication
Calibration (cont.)
Allow the XMO2 to warm up for at least 30 minutes to allow the
measurement cell operating temperature to stabilize. Then, proceed
with 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 offset gas
specified on the XMO2 Calibration Sheet. Establish the same flow
rate and pressure conditions used for the sample gas, and allow the
offset gas to flow through the XMO2 for at least five minutes.
2. Enter the XMO2 Basic Menu by slowly keying in
[Shift]+[1] (if the
XMO2 is set up for Easy Menu Entry) or
[Enter], [1], [2], [3]. Refer
to the menu map in Figure C-1 on page C-1 for the options
available in this menu.
3. For a one-gas (offset gas) calibration, press
[N] repeatedly until the
following display appears:
4. Note that the display now shows the %O
2
level, as calculated
using the factory programmed calibration data listed on your
XMO2 Calibration Sheet.
5. After the automatic Quick Offset calibration is complete, the
following display appears:
The XMO2 Quick Offset calibration is now complete, and the display
shows the corrected %O
2
level. In addition, the 4-20 mA analog
output has also been calibrated.
20.93 %O2
Next, the XMO2 begins taking
measurements and displays the
current oxygen concentration.
BASIC MENU
Press [Y] or [Enter] to perform a
Quick Offset calibration.
Quick Offset?
BASIC MENU
Press [N] repeatedly until the
following menu option appears:
Quick Offset?
BASIC MENU
Press [Y] or [Enter] to return to
Operate Mode.
Resume?
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