Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer - Manual (Page 7)

Advanced Instruments Inc.
7
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-2000 Series of portable oxygen analyzers incorporate a variety of percentage range advanced galvanic fuel cell type
sensors. The analyzers are configured in a general purpose NEMA 4 rated enclosure. Units configured without integral sample
pumps meet the intrinsic safety standards required for use in Class 1, Division 1, Groups A, B, C, D hazardous areas. Two
integral sampling pump options are available – one that meets the intrinsic safety standards and a less expensive option for
general purpose service.
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.