Advanced Instruments Inc.
5. Operation
Principle of Operation
The GPR-1200 portable oxygen analyzer incorporates a variety of PPM range advanced galvanic fuel cell type sensors.
The analyzer is configured in a general purpose NEMA 4 rated enclosure and meets the intrinsic safety ATEX Directive
94/9/EC for use in Zone 1 Groups C and D hazardous areas. The integral sampling pump (GPR-1200P) meets the
intrinsic safety standards.
Advanced Galvanic Sensor Technology
All galvanic type sensors function on the same principle and are very specific to oxygen. They measure the partial
pressure of oxygen from low PPM to % 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 and
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 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 the design and chemistry add significant advantages to an extremely versatile oxygen
sensing technology. Sensors for low PPM analysis recover from air to low PPM levels in minutes, exhibit longer life,
extended operating temperature range of -20°C to 50°C, excellent compatibility with CO
2
and other acid gases (XLT
series sensors only) and reliable quality giving them a significant advantage over the competition.
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. Other significant developments involve the first galvanic oxygen sensor capability
of continuous oxygen purity measurements and expanding the operating temperature range from -40°C to 50°C.
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