Owner's manual

Advanced Instruments Inc.

Gas Connections

The GPR-1600MS 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 required components,

see below. Flow rates of 1-3 SCFH cause no appreciable change in the oxygen reading. A flow

indicator with an integral metering valve upstream of the sensor is recommended as a means

of controlling the flow rate of the sample gas. A flow rate of 1 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.