Analytical Industries GPR-2600 Series Oxygen Analyzer - Manual (Page 16)

Advanced Instruments Inc.
16
Gas Connections
The GPR-2600 with its standard flow through configuration is designed for positive pressure samples
and requires connections for incoming sample and outgoing vent lines, see illustrations above.
The user is responsible for calibration gases and the components described below. Flow rates of 1-5
SCFH cause no appreciable change in the oxygen reading. A flow valve upstream (flow indicator
downstream) of the sensor is recommended as a means of controlling the flow rate of the sample
gas. A flow rate of 2 SCFH is recommended for optimum performance.
Caution: Do not place your finger over the fitting designated as the vent (it pressurizes the sensor)
or to test the flow indicator when gas is flowing to the sensor. Removing your finger (the restriction)
generates a vacuum on the sensor and may damage the sensor (voiding the sensor warranty).
Procedure:
1. Caution: Do not change the factory setting until instructed.
2. Regulate the pressure and flow as described in Pressure & Flow above.
3. Install the sample out or vent line connection to the 1/8” dia. fitting labeled SAMPLE VENT.
4. Install the incoming sample or span gas line to the 1/8” dia. fitting labeled SAMPLE IN.
5. Set the flow rate to 1 SCFH (open the flow control valve completely if using an external sampling pump positioned
downstream of the sensor).
6. Allow gas to flow through the analyzer for 3-5 minutes and proceed to Calibration or Sampling.