GE Baker Hughes oxy.IQ, User Manual

Page: 27 / 91

Chapter 3. Initial Setup & Operation
oxy.IQ User’s Manual 17
3.3.2c Trimming the Analog Output High (20 mA) End
1.
Press the key and then press the
Enter
key to enter the 20
mA Trim menu, and the analog output is driven to about 20 mA.
2.
Use the and keys to adjust the analog output up or down,
until it equals 20.00 ± 0.01 mA.
3.
Press the
Enter
key to save the trim adjustment and return to
the Trim menu.
3.3.2d Completing the Trim Procedure
1.
Repeat both the low (4 mA) end and high (20 mA) end analog
output trimming steps until no further trimming adjustments are
required.
2.
Press the
Cancel
key twice to return to the Main Menu .
3.3.3 Air Calibration
An air calibration is always recommended upon installation of a new
oxygen sensor. However, because of the non-linearity of the oxygen
sensor, a span gas calibration (see the next section) can also be
performed to ensure a faster and more accurate calibration for the
ppm ranges.
To perform an air calibration, complete the following steps:
1.
Press the
Enter
key to enter the Main Menu .
2.
Press the
Enter
key to enter the Calibration menu.
3.
Press the
Enter
key to select the Air menu option.
4.
Proceed to the appropriate section, depending on whether you
are calibrating a new sensor or recalibrating an existing sensor.
CAUTION!
The useful life of ppm sensors is extended by
minimizing exposure of the sensor to air.