Analytical Industries GPR-1200 ATEX Portable Trace PPM Oxygen Analyzer - Manual (Page 12)

12
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-1200 analyzer can operate continuously when connected to AC
power using the appropriate charging adapter.
Gas Connections
The GPR-1200 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 1-5 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 2 SCFH or 1liter per minute 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 SAMPLE/BYPASS 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. Connect the 1/8” dia. metal vent line to the fitting designated VENT.
5. Connect the 1/8” dia. metal sample gas line to the fitting designated SAMPLE IN.
6. Set the flow rate to 2 SCFH
7. Open the flow control valve completely if using an external sampling pump positioned downstream of the sensor.
8. 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.
Electrical Connections
Power is supplied by an integral rechargeable lead acid battery which provides enough power to operate the analyzer
continuously for approximately 60 days. An LED located on the front panel provides a blinking 72 hour warning to recharge the
battery. A 9VAC adapter (positive pole located on the inside of the female connector) can be used to recharge the battery from
a 110V or 220V convenience outlet. The analyzer is designed to be fully operational during the 8-10 hour charging cycle which
is indicated by a second continuously lit LED.
Procedure:
1. Locate a source of AC power to meet the area classification, plug in the appropriate charging adapter to the outlet
2. Connect the jack at the other end to the mating receptacle identified on the analyzer.
The analyzer provides a 0-1V full scale 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.