Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 23)

Advanced Instruments Inc.

Application Pressure - Positive:

A FLOW valve positioned upstream of the sensor controls the sample flow rate to the

recommended 2 SCFH. If necessary, a pressure regulator (with a metallic diaphragm is

recommended for optimum accuracy, the use of diaphragms of more permeable

materials may result in erroneous readings) upstream of the flow control valve should

be used to regulate the inlet pressure between 5-30 psig.

Application Pressure - Atmospheric or Slightly Negative:

For measurements under these conditions, an optional integral sampling pump is

positioned downstream of the sensor to draw the sample from the process, by the

sensor and out to atmosphere. Flow rates of 1-5 SCFH cause no appreciable change in

the oxygen reading. However, flow rates above 5 SCFH can generate erroneous oxygen

readings. A FLOW 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 is recommended for optimum performance.

Procedure:

1. Review the end of the Span Calibration procedure and Pressure & Flow in section 3.

2. Select the desired sampling range that provides maximum resolution.

3. Use metal tubing to transport the sample gas to the analyzer. The main consideration is to eliminate air leaks which can

affect oxygen measurements.

4. Ensure the sensor is tightly secured in the sensor housing, do not over tighten (evidenced by a deformed o-ring).

5. Ensure the sample gas tube fittings are properly installed with both ferrules, finger tightened and ¾ of a turn for 1/8”

tubing and 1-1/4 of a turn for ¼” tubing.

6. Assure there are no restrictions in the sample gas lines – inlet or vent.

To avoid erroneous oxygen readings and damaging the sensor:

¾ 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).

¾ Assure there are no restrictions in the sample or vent lines

¾ Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually

¾ Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor.

¾ Avoid sudden releases of backpressure that can severely damage the sensor.

¾ Avoid the collection of particulates, liquids or condensation collect on the sensor that could block the diffusion of oxygen

into the sensor.

Recommended Safety Checklist

The user is responsible for determining whether the unit will assure safety in his particular application and establishing safety

precautions. It is strongly recommended the operator understands, tests the operation of this oxygen deficiency alarm and

develop a safety checklist related to the use of this unit. The checklist should include but not be limited to:

1. Limiting access to unit to authorized and trained personnel.

2. Install a switch or circuit breaker near the equipment to disconnect the AC power during service intervals to prevent electric

shock and possible damage to the equipment.

3. Follow the instruction for Electrical Connections and use a minimum of 18 AWG cable for AC power connections.

4. Test and calibration procedures are instituted and routinely followed.

5. Users understand the operation and functions of the unit.

6. The user consult a safety expert in the selecting the most appropriate location to install the unit and providing all necessary

warning notices.

7. Source of AC power is reliable and adequate. In the event AC power is interrupted, users should not depend on the battery

backup but correct the problem as quickly as possible.

8. Assure the battery is in good operating condition by periodically disconnecting the AC power and operating the unit for

several hours under battery power verifying the various functions of the unit are operational and alarm indicators operate

as intended.

9. Any sampling considerations are identified and resolved.

10. External environmental considerations are identified and resolved.

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Analytical-industries GPR-35 Oxygen Analyzer Manuel d'utilisateur Page 23

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