Analytical Industries GPR-2800 AIS ATEX Oxygen Analyzer - Manual (Page 14)

Advanced Instruments Inc.
14
Span Gas Preparation
Caution: Do not contaminate the span gas cylinder when connecting the regulator. Bleed the air filled regulator (faster and
more reliable than simply flowing the span gas) before attempting the initial calibration of the instrument.
Required components:
1. Certified span gas cylinder with an oxygen concentration, balance nitrogen, approximating 80% of the full scale range
above the intended measuring range.
2. Regulator to reduce pressure to between 5 and 30 psig.
3. Flow meter to set the flow between 1-5 SCFH,
4. Suitable fittings and a 4-6 ft. in length of 1/8” dia. metal tubing to connect the regulator to the flow meter inlet
5. Suitable fitting and a 4-6 ft. in length of 1/8” dia. metal tubing to connect from the flow meter vent to tube fitting
designated SAMPLE IN on the GPR-1200.
Procedure:
1. With the span gas cylinder valve closed, install the regulator on the cylinder.
2. Open the regulator’s exit valve and partially open the pressure regulator’s control knob.
3. Open slightly the cylinder valve.
4. Loosen the nut connecting the regulator to the cylinder and bleed the pressure regulator.
5. Retighten the nut connecting the regulator to the cylinder
6. Adjust the regulator exit valve and slowly bleed the pressure regulator.
7. Open the cylinder valve completely.
8. Set the pressure between 5-30 psig using the pressure regulator’s control knob.
9. Caution: Do not exceed the recommended flow rate. Excessive flow rate could cause the backpressure on the sensor and
may result in erroneous readings and permanent damage to the sensor.
Establishing Power to the Electronics
Once the two wires of the shielded cable are properly connected to the terminals inside the junction box as described above,
connect the other end of the two wires to a suitable 12-28V DC power supply with negative ground such as a PLC, DCS, etc.
The digital display responds instantaneously. When power is applied, the transmitter performs several diagnostic system status
checks termed “START-UP TEST” as illustrated below:
START-UP TEST
ELECTRONICS – PASS
TEMP SENSOR – PASS
BAROMETRIC SENSOR – PASS
REV. 1.61
Note: The transmitter display defaults to the sampling mode when 30 seconds elapses without user interface.
3.3
%
AUTO SAMPLING
10 % RANGE
24.5 C 100 KPA
LO1 2% 10% HI2