Analytical Industries GPR-35 Oxygen Analyzer - Manual (Page 6)

Advanced Instruments Inc.
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Cleaning: The analyzer should be cleaned only as recommended by the manufacturer. Wipe off dust and dirt from the outside
of the unit with a soft damp cloth then dry immediately. Do not use solvents or chemicals.
Nonuse Periods: Disconnect the power when the analyzer is left unused for a long period of time.
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.
Installation
Gas Sample Stream: Ensure the gas stream composition of the application is consistent with the specifications and review the
application conditions before initiating the installation. Consult the factory to ensure the sample is suitable for analysis. Note: In
natural gas applications such as extraction and transmission, a low voltage current is applied to the pipeline itself to inhibit
corrosion. As a result, electronic devices can be affected unless adequately grounded.
Contaminant Gases: A gas scrubber and flow indicator with integral metering valve are required upstream of the of the
analyzer to remove interfering gases such as oxides of sulfur and nitrogen or hydrogen sulfide that can produce false readings,
reduce the expected life of the sensor and void the sensor warranty if not identified at time of order placement. Installation of a
suitable scrubber is required to remove the contaminant from the sample gas to prevent erroneous analysis readings and
damage to the sensor or optional components. Consult the factory for recommendations concerning the proper selection and
installation of components.
Expected Sensor Life: With reference to the publish specification located as the last page of this manual, the expected life of
all oxygen sensors is predicated on oxygen concentration (< 1000 ppm or air), temperature (77°F/25°C) and pressure (1
atmosphere) in “normal” applications. Deviations are outside the specifications and will affect the life of the sensor. As a rule of
thumb sensor life is inversely proportional to changes in the parameters.
Accuracy & Calibration: Refer to section 5 Operation.
Materials: Assemble the necessary zero, purge and span gases and optional components such as valves, coalescing or
particulate filters, and, pumps as dictated by the application; stainless steel tubing is essential for maintaining the integrity of
the gas stream for ppm and percentage range (above or below ambient air) analysis; hardware for mounting.
Operating Temperature: The sample must be sufficiently cooled before it enters the analyzer and any optional components.
A coiled 10 foot length of ¼” stainless steel tubing is sufficient for cooling sample gases as high as 1,800ºF to ambient. The
maximum operating temperature is 45º C on an intermittent basis unless the user is willing to accept a reduction in expected
sensor life – refer to analyzer specification - where expected sensor life is specified at an oxygen concentration less than 1000
ppm oxygen for ppm analyzers and air (20.9% oxygen) for percent analyzers, but in all instances at 25°C and 1 atmosphere of
pressure. Expected sensor varies inversely with changes in these parameters.