Chapter 3. Initial Setup and Operation
10
oxy.IQ User’s Manual
3.3 Adjusting and Calibrating the oxy.IQ
Upon startup, the following five-step adjustment and calibration procedure must be performed on the oxy.IQ:
1.
Select the desired output range.
2.
Trim the low (4 mA) and high (20 mA) analog outputs.
3.
Upon installation of a new oxygen sensor, calibrate the unit with air for either a ppm or % sensor.
4.
For ppm sensors only, purge the sensor with a low ppm oxygen gas.
5.
For all subsequent calibrations, use a span gas that is appropriate for the sensor and range selected.
3.3.1
Selecting the Output Range
To select the desired measurement range, complete the following steps:
1.
Press the
Enter
key to enter the
Main Menu
.
2.
Press the
key twice and then press the
Enter
key to enter the
Output
menu.
3.
Press the
Enter
key to select the
Range
menu option.
4.
Use the
and
keys to scroll through the available options, as listed in
5.
After selecting the desired output range, press the
Enter
key to save the selection. Then, press the
Cancel
key to return to the
Output
menu.
3.3.2 Trimming the Analog Output
To trim the analog output, calibrate the low (4 mA) end of the output then the high (20 mA) end of the output.
IMPORTANT:
The 4 mA and 20 mA adjustments interact with each other. Therefore, recheck the trim after the
procedure has been completed.
3.3.2.1
Preparing to Trim the Analog Output
Prepare to trim the analog output as follows:
1.
Connect an ammeter in series with the positive oxy.IQ power supply lead, to monitor the analog output current.
2.
Press the
Enter
key to enter the
Main Menu
.
3.
Press the
key twice and then press the
Enter
key to enter the
Output
menu.
4.
Press the
key and then press the
Enter
key to enter the
Trim
menu.
3.3.2.2
Trimming the Analog Output Low (4 mA) End
1.
Press the
Enter
key to enter the 4 mA
Trim
menu, and the analog output is driven to about 4 mA.
2.
Use the
and
keys to adjust the analog output up or down, until it equals 4.00 ± 0.01 mA.
3.
Press the
Enter
key to save the trim adjustment and return to the
Trim
menu.
Table 3: Available Output Ranges
Units
Span Value
% O
2
1, 2, 5, 10, 21, 25, 50, 100
ppm O
2
10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000
Summary of Contents for Panametrics oxy.IQ
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