Analytical-industries GPR-28 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 17)

Advanced Instruments Inc.

Gas Connections

The analyzers flow through configuration is designed for positive pressure samples and requires connection to 1/8” diameter

tube fittings, see illustration, of the FLOW control valve (SAMPLE IN), SAMPLE/BYPASS valve (ppm analyzers only and flow

indicator (SAMPLE OUT or VENT).

The user is responsible for making provision for calibration gases, regulating the pressure and flow as described below in the

Span Gas Preparation section.

Recommendation: When installing analyzer, consider installing an optional 3-way valve before the FLOW valve to provide a

permanent connection for span gas and means of switching from SAMPLE to SPAN gas and vise versa without breaking gas line

connections. This arrangement would eliminate the possibility of exposing the sensor to air (if the sample line is disconnected)

and shorten the calibration time. However, before changing gas lines allow the gas to flow for 1-2 minutes to purge the

stagnant gas which has accumulated air through leakage of the connections.

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, the SAMPLE/BYPASS valve should be in BYPASS position.

2. Locate the sample inlet and outlet fittings respectively at the rear of the gas panel of the analyzer, refer to the illustration

above under the Mounting the Analyzer section.

3. Regulate the pressure to as described in section 4.

4. Assure there are no restrictions in the vent line.

5. Connect the 1/8” dia. metal vent line to the fitting designated SAMPLE OUT or VENT.

6. Connect the 1/8” dia. metal sample gas line to the fitting designated SAMPLE IN.

7. Allow the gas flow for 1-2 minutes to purge the air trapped inside the gas lines.

8. Adjust the FLOW valve until the recommended flow rate of is reached.

Note: Open the flow control valve completely if using an external sampling pump positioned downstream of the sensor.

9. Switch the SAMPLE/BYPASS valve to the SAMPLE position.

10. If the sensor is shipped separately, continue following these instructions which include Installing the Oxygen Sensor below.

Electrical Connections

Power must be supplied through a separate conduit on the left side of the enclosure, see above #1. Use a shielded power cord

with minimum of 18 gauge wires. If equipped with the optional temperature controlled heater system, the required internal

wiring has been installed at the factory. The user simply connects an appropriate source of AC power (determined by the

requirements specified for the heater) to the terminal strip as illustrated below.

Caution: Additional penetrations to the enclosure may only be made by ATEX certified personnel. The output and alarm

connections are supplied through the right side of the enclosure. To prevent external fire or explosion user must must observe

the manufacturer’s installation and maintenance instruction found in the appendices which are an integral part of this Owner’s

Manual.

Note: The heater system is rated for 100/110 VAC or 220/230 VAC not both. Note the rating of the power requirement for the

heater. An improper voltage could permanently damage the heating system.

Danger: Avoid electric shock, exercise extreme caution when servicing the analyzer.

¾ Disconnect the AC power source before removing the protective plexiglas panel that covers the terminal block. If the AC

power source is connected to the terminal block, touching any terminal connections where AC power is present such as

transformer pins and AC connector on the PCB Assembly would result in an electric shock.

¾ Replace the protective plexiglas panel before establishing power to AND after servicing the analyzer electronics.

¾ Note: There is no AC power present on the circuit board assemblies found on the door of the analyzer.

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Analytical-industries GPR-28 Oxygen Analyzer Manuel d'utilisateur Page 17

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