Analytical Industries GPR-1200 MS ATEX Portable PPB Oxygen Analyzer - Manual (Page 13)

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Mounting the Analyzer:
Normally mounting a portable analyzer is not a consideration. However,
The analyzer enclosure is cast with four (4) holes in the bottom section
specifically intended for wall mounting. The GPR-1200MS analyzer can
operate continuously when connected to AC power using the
appropriate charging adapter.
Gas Connection:
The GPR-1200MS flow through configuration is designed for positive
pressure samples and requires connections to incoming sample and
vent 1/8” diameter tube fittings. The user is responsible for making
provision for calibration gases, see Calibration section of the analyzer
specification and Installing Span Gas below.
Flow rates of 1-3 SCFH cause no appreciable change in the oxygen reading. However, flow
rates above 5 SCFH generate backpressure and erroneous oxygen readings because the diameter of the integral
tubing cannot evacuate the sample gas at the higher flow rate.
A flow control valve upstream of the sensor controls the flow rate of the sample gas which is displayed by the flow
indicator downstream of the sensor. A flow rate of 1 liter per minute (.5-1 SCFH) is recommended for optimum
performance.
Caution: Do not place your finger over the vent (it pressurizes the sensor) 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, leave the SHUT OFF valve closed and 3-way valve
in the BYPASS position.
2. Locate the inlet and vent fittings respectively on the right side of the analyzer. Note: The instructions related to
proper operation of the valves is silk-screened on the right side of the analyzer.
3. Regulate the pressure and flow as described in Pressure & Flow above.
4. Install the 1/8” dia. metal vent line to the fitting designated VENT.
5. Install the 1/8” dia. metal sample gas line to the fitting designated SAMPLE IN.
6. Set the flow rate to 2 SCFH (open the flow control valve completely if using an external sampling pump
positioned downstream of the sensor).
7. Allow gas to flow through the analyzer for 3-5 minutes in the BYPASS mode to purge air trapped in the sample
gas line before proceeding to Calibration or Sampling.
Power Connection:
Locate a source of AC power to meet the area classification, plug in the appropriate charging adapter to the outlet
and connect the jack at the other end to the mating receptacle identified on the analyzer.
Output Connection:
The analyzer provides a 0-1V full scale with negative ground signal output for external recording devices.
Procedure:
1. Connect the lead wires from the external recording device to the male phone plug supplied with analyzer.
(Note: Connect the positive lead to the center terminal of the male phone plug.)
2. Insert the male phone plug into the integral female OUTPUT jack located on the side of the enclosure.