Analytical-industries GPR-2000 ATEX Portable Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 12)

Advanced Instruments Inc.

Mounting the Analyzer

Normally mounting a portable analyzer is not a consideration. However, the GPR-2000 Series analyzers can operate

continuously when connected to AC power using the appropriate charging adapter. The analyzer enclosure is cast with four (4)

holes in the bottom section specifically intended for wall mounting.

Gas Connections

The GPR-2000 flow through configuration is designed for positive pressure samples and

requires connections for incoming sample and vent lines (optional). The user is responsible

for making provision for introducing gases for calibration purposes.

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 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 2 SCFH or 1 liter per

minute is recommended for optimum performance.

The GPR-2000P configuration includes an integral sampling pump intended for sampling

applications with atmospheric and slightly negative pressure conditions. The GPR-2000P can

also be used for positive pressure applications by turning the pump ON/OFF switch to OFF

position. The pump discharges at a predetermined flow rate of 2 SCFH.

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.

2. Locate the inlet and vent fittings on the left and right side of the analyzer respectively.

3. Regulate the pressure as described in Pressure & Flow above.

4. Connect a 1/8” dia. length of plastic tubing to the vent fitting (optional).

5. Connect a 1/8” dia. Length of plastic tubing to the inlet fitting.

6. Connect the other end of the inlet tubing to the gas to be sampled.

7. Set the flow rate to 2 SCFH (not required with GPR-2000P).

8. Allow gas to flow through the analyzers for 3-5 minutes and proceed 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.

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Analytical-industries GPR-2000 ATEX Portable Oxygen Analyzer Manuel d'utilisateur Page 12

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