Advanced Instruments GPR-2500 Owner's Manual
Also see for GPR-2500: Owner's manualOwner's manual
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75 OperationPrinciple of OperationThe GPR-2500/2500MO oxygen transmitter incorporates a variety of ppm range advanced galvanic fuel cell typesensors. The transmitter is configured in a general purpose NEMA 4X rated enclosure and meets the intrinsic safetystandards required for use in Class 1, Division 1, Groups A, B, C, D hazardous areas when operated in conjunctionwith the manufacturer’s recommended optional intrinsic safety barriers.Advanced Galvanic Sensor Technology:The sensors function on the same principle and are specific for oxygen. They measure the partial pressure ofoxygen from low ppm to 100% levels in inert gases, gaseous hydrocarbons, helium, hydrogen, mixed gases, acidgas streams and ambient air. Oxygen, the fuel for this electrochemical transducer, diffusing into the sensor reactschemically at the sensing electrode to produce an electrical current output proportional to the oxygen concentrationin the gas phase. The sensor’s signal output is linear over all ranges and remains virtually constant over its usefullife. 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 oxygensensing technology. Sensors for low ppm analysis recover from air to ppm levels in minutes, exhibit longer life andreliable quality. The expected life of our new generation of percentage range sensors now range to five and tenyears with faster response times and greater stability. Another significant development involves expanding theoperating temperature range for percentage range sensors from -30°C to 50°C.Electronics:The signal generated by the sensor is processed by state of the art low power micro-processor based digitalcircuitry. The first stage amplifies the signal. The second stage eliminates the low frequency noise. The third stageemploys a high frequency filter and compensates for signal output variations caused by ambient temperaturechanges. The result is a very stable signal. Sample oxygen is analyzed very accurately. Response time of 90% offull scale is less than 10 seconds (actual experience may vary due to the integrity of sample line connections, deadvolume and flow rate selected) on all ranges under ambient monitoring conditions. Sensitivity is typically 0.5% offull scale low range. Oxygen readings may be recorded by an external device via the 0-1V signal output jack.A 4-20mA signal output is provided from a two-wire 12-36VDC loop power source such as a PLC and is representedon full scale oxygen readings to an external device. When operated in conjunction with the manufacturer’srecommended optional intrinsic safety barriers the GPR-2500/GPR-2500MO meets the intrinsic safety standardsrequired for use in Class 1, Division 1, Groups A, B, C, D hazardous areas.Sample System:The GPR-2500/2500MO is supplied without a sample conditioning system for maximum portability. However thesample must be properly presented to the sensor to ensure an accurate measurement. Users interested in addingtheir own sample conditioning system should consult the factory. Advanced Instruments Inc. offers a full line ofsample handling, conditioning and expertise to meet your application requirements. Contact us at 909-392-6900 ore-mail us at aii2@earthlink.net |
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