Analytical Industries GPR-2500 Series Oxygen Transmitter - Manual (Page 28)

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Procedure:
This procedure assumes a span gas under positive pressure and is recommended for a transmitter without an
optional sampling pump, which if installed downstream of the sensor should be placed in the OFF position and
disconnected so the vent is not restricted during calibration.
To assure an accurate calibration, the temperature and pressure of the span gas must closely approximate the
sample conditions.
For calibration purposes, use of the AUTO SAMPLE mode is recommended. However, the user can select the full
scale MANUAL SAMPLE RANGE for calibration as dictated by the accuracy of the analysis required – for example, a
span gas with an 8% oxygen concentration with the balance nitrogen would dictate the use of the 0-10% full scale
range for calibration and a 0-1%, 0-5% or 0-10% measuring range. Select as described above.
Note: The GPR-2500MO has a single 0-100% range and should be calibrate in accordance with the application as
described above.
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight AUTO SAMPLE.
3. Press the ENTER key to select the highlighted menu option.
4. The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATE
24.5 C 100 KPA
3.3
%
AUTO SAMPLING
10% RANGE
24.5 C 100 KPA
5. Return to the MAIN MENU by pressing the MENU key.
6. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATE.
7. Press the ENTER key to select the highlighted menu option.
8. Repeat to select SPAN CALIBRATE
9. The following displays appear:
MAIN MENU
AUTO SAMPLE
MANUAL SAMPLE
CALIBRATE
24.5 C 100 KPA
>>>
CALIBRATION
SPAN CALIBRATE
ZERO CALIBRATE
DEFAULT SPAN
DEFAULT ZERO
24.5 C 100 KPA
10. Assure there are no restrictions in vent line.