Startup & Operation 3-5
September 2007
Pushbutton Calibration
(cont.)
Note: The XMO2’s digital printed circuit board (PCB #703-1139) is
located directly below the cover (see Figure 3-1 on page 3-4).
1. By referring to Figure 3-2 on page 3-4, locate terminal block TB1.
Connect the positive lead of an ammeter to Pin 3 on TB1 and
connect the negative lead of the ammeter to Pin 4 on TB1.
IMPORTANT: A current measurement cannot be made in parallel
with any other resistance. If other wires are already
connected to Pins 3 and 4 of TB1, temporarily
disconnect them prior to connecting the ammeter.
2. 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 three minutes.
3. Using the ammeter, record the analog output mA value and
compare it to the expected value.
4. Using Figure 3-2 on page 3-4 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.
5. When the Calibration Pushbutton is released, the green light will
come back on and the XMO2 has been recalibrated. Verify that the
mA reading on the ammeter is now equal to the expected value.
Note: If the XMO2 fails to recalibrate to the correct analog output
value, contact the factory for assistance.
If you are connected to a computer or terminal via the RS232 digital
output, you can view the results of the offset gas pushbutton
calibration by selecting View Offset from the Basic Menu. See
Chapter 5, Basic Programming, for detailed instructions.
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