Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 23)

Advanced Instruments Inc.
23
Procedure Air Calibration – Without Integral Pump:
1. Review the above Span Calibration procedure and the following instructions before proceeding:
(a) Range selection and menu operation – note steps #7-9 and #28-29 do not apply.
(b) Section 6 Maintenance – instructions for removing the sensor explain how to
expose the sensor to ambient air.
2. Access the interior of the analyzer by removing the four (4) screws securing the front
panel of the analyzer.
3. Caution: Do not remove or discard the gaskets from the enclosure. Failure to reinstall
the gasket will void the NEMA rating.
4. Remove the sensor from the sensor housing as described in section 6 Maintenance.
5. Hold the sensor between your thumb and first two fingers.
6. With the sensor exposed to ambient air – resume the above procedure and perform steps
#10-27 – remember steps #28, 29 don’t apply.
7. Reinstall the sensor as described in section 6 Maintenance.
8. Replace the front cover of the analyzer and ensure that the gasket is replaced to maintain
CE approval and NEMA 4 rating.
9. Tighten the four (4) screws to secure the front cover.
10. Wait 5-10 minutes to ensure the reading is stable and proceed to sampling.
Procedure Air Calibration – with Integral Pump:
1. Review the above Span Calibration procedure and the following instructions before
proceeding:
(a) Range selection and menu operation – note steps #7-9 and # 28-29 do not apply.
(b) Section 6 Maintenance – instructions for removing the sensor explain how to
expose the sensor to ambient air.
2. Select a source of good ambient air.
3. Disconnect any tubing connected to the inlet fitting located on the left side of the
analyzer.
4. Toggle the pump ON/OFF switch to the ON position to operate the integral sampling
pump and draw the ambient air span gas into the analyzer.
5. With the integral pump operating – resume the above procedure and perform steps
#10-27 – remember steps #28-29 don’t apply.
6. Connect the tubing to the inlet fitting and proceed to sampling.
Output Span
Accuracy due to manufacturer tolerances may result in a slight difference between the LCD display and the 0-1V analog output.
However, the difference is less than 0.25% of range and falls well below the specified accuracy of the analyzer. In rare
instances the 0-1V signal output may not agree to the reading displayed by the LCD. This feature enables the user to adjust the
1V signal output should the LCD display not agree. Note: Adjust the 0V signal output with the OUTPUT ZERO option described
above.
Procedure:
1. Access the MAIN MENU by pressing the MENU key.
2. Advance the reverse shade cursor using the ARROW keys to highlight CALIBRATION.
3. Press the ENTER key to select the highlighted menu option and the following displays appear: