Baker Hughes Panametrics oxy.IQ, Руководство пользователя

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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 Table 3 below.
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