Advanced Instruments Inc.
10
5 Operations
Principle of Operation
The GPR-35 oxygen analyzer incorporates a variety of percentage range advanced galvanic fuel cell type sensors. In compliance
with OSHA specifications, the standard unit is configured with two oxygen alarms which have been set by the factory to
energize audio and visual alarms when oxygen levels fall below CAUTION (20.0% O
2
) and DANGER (19.5% O
2
) housed in a
general purpose NEMA 4 rated wall mount enclosure.
Optional equipment includes a remote sensor, 19.5% low and 23.0% high alarm configuration, an integral sampling pump, 4-
20mA isolated signal output, integral audible alarm or external audible and/or visual alarms.
The GPR-35 is CE certified and manufactured along with the sensors under a Quality Assurance System certified by an
independent agency to ISO 9001:2000 standards.
Advanced Galvanic Sensor Technology
The sensors function on the same principle and 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, extended operating
range of -20°C to 50°C, excellent compatibility with CO
2
and acid gases (XLT series) 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.
(40 pages)
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