Advanced Instruments GPR-2800 IS Manual
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Advanced Instruments, Inc12Advanced Galvanic Sensor TechnologyAll galvanic type sensors function on the same principle and are specific to oxygen. They measure thepartial pressure of oxygen from low PPM to 100% levels in inert gases, gaseous hydrocarbons, helium,hydrogen and mixed gasesOxygen, the fuel for this electrochemical transducer, diffusing into the sensor, reacts electrochemically at thesensing electrode to produce an electrical current output proportional to the oxygen concentration in the gasphase. The sensor’s signal output is linear over all measuring ranges and remains virtually constant over itsuseful 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 this extremely versatileoxygen sensing technology. Sensors for low % analysis recover from air to low % levels in seconds, exhibitlonger life and reliable quality. The expected life of our new generation of percentage range sensors nowrange from 32 months to ten years with faster response times and greater stability. Another significantdevelopment involves expanding the operating temperature range for percentage range sensors from -30°Cto 50°C. Contact factory for more specific information about your application.The PPM sensors recover from an upset condition to low PPM level in a matter of few minutes. Thesesensors show excellent stability over its useful life.ElectronicsThe 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 thirdstage employs a high frequency filter and compensates for signal output variations caused by ambienttemperature changes. The result is a very stable signal. Sample oxygen is analyzed very accurately.Response time of 90% of full scale is less than 10 seconds (actual experience may vary due to the integrityof sample line connections, dead volume and flow rate selected) on all ranges under ambient monitoringconditions. Sensitivity is typically 0.5% of full scale of the low range. Oxygen readings may be recorded byan external device via the 4-20 mA or 1-5V signal output. |
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