Analytical Industries GPR-3500 MO Portable Oxygen Analyzer - Manual (Page 7)

Advanced Instruments Inc.
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Moisture and/or particulates generally can be removed from the sensor by opening the sensor housing and either blowing on the the
sensing surface or gently wiping or brushing the sensing surface with damp cloth. Caution: Minimize the exposure of ppm sensors to
air during this cleaning process. Air calibration followed by purging with zero or a gas with a low ppm oxygen concentration is
recommended following the cleaning process. Moisture and/or particulates generally can be removed from the sample system by
flowing the purge gas through the analyzer at a flow rate of 4.5-5 SCFH for an hour.
Mounting: The analyzer is approved for indoor use, outdoor use requires optional enclosures, consult factory. Mount as recommended
by the manufacturer.
Gas Connections: Inlet and outlet vent gas lines for ppm analysis require 1/8” or ¼” stainless steel compression fittings; hard plastic
tubing with a low permeability factor can be used percentage range measurements.
Power: Supply power to the analyzer only as rated by the specification or markings on the analyzer enclosure. The wiring that
connects the analyzer to the power source should be installed in accordance with recognized electrical standards. Ensure that is
properly grounded and meets the requirements for area classification. Never yank wiring to remove it from a terminal connection. AC
powered analog analyzers consume 5 watts, digital analyzers 50 watts without optional heaters. Optional 110V and 220V heaters AC
powered heaters consume an additional 100-150 watts; DC powered digital analyzers consume 30 watts, 40 watts with the optional DC
powered heater.
4 Features & Specifications
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5 Operation
Principle of Operation
The GPR-3500MO portable oxygen purity analyzer incorporates a unique advanced electrochemical galvanic fuel cell type sensor. The
portable oxygen purity analyzer is configured in an intrinsically safe design and meets the intrinsic safety standards required for use in
Class 1, Division 1, Groups A, B, C, D hazardous areas.
Advanced Galvanic Sensor Technology
The sensors are specific for oxygen. They measure the partial pressure of oxygen from low ppm to 100% levels in inert gases, gaseous
hydrocarbons, helium, hydrogen, mixed gases, acid gas streams and ambient air. Oxygen, the fuel for this electrochemical transducer,
diffusing into the sensor reacts chemically at the sensing electrode to produce an electrical current output proportional to the oxygen
concentration in the gas phase. The sensor’s signal output is linear over all ranges and remains virtually constant over its useful life.
The sensor requires no maintenance and is easily and safely replaced at the end of its useful life.
Proprietary advancements in design and chemistry add significant advantages to an extremely versatile oxygen sensing technology.
Sensors for low ppm analysis recover from air to ppm levels in minutes, exhibit longer life and reliable quality. The expected life of our
new generation of percentage range sensors now range to five and ten years with faster response times and greater stability. Another
significant development involves expanding the operating temperature range for percentage range sensors from -30°C to 50°C.