Advanced instruments inc – Analytical Industries GPR-2000 ATEX Portable Oxygen Analyzer User Manual
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Advanced Instruments Inc.
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Electronics
The signal generated by the sensor is processed by state of the art low power micro-processor based digital circuitry. The first
stage amplifies the signal. The second stage eliminates the low frequency noise. The third stage employs a high frequency filter
and compensates for signal output variations caused by ambient temperature 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 integrity of sample line connections, dead volume and flow rate selected) on all ranges under ambient
monitoring conditions. Sensitivity is typically 0.5% of full scale low range. Oxygen readings may be recorded by an external
device via the 0-1V signal output jack.
Power is supplied by an integral rechargeable lead acid battery which provides enough power to operate the analyzer
continuously for approximately 60 days. Expect 8-10 hours service from a single battery charge when using the pump on a
regular basis. An LED located on the front panel provides a blinking 72 hour warning to recharge the battery. A 9VAC adapter
(positive pole located on the inside of the female connector) can be used to recharge the battery from a convenience outlet.
The analyzer is designed to be fully operational during the 8-10 hour charging cycle which is indicated by a second continuously
lit LED.
Sample System
The GPR-2000 is supplied without a sample conditioning system for maximum portability. However the sample must be properly
presented to the sensor to ensure an accurate measurement. Users interested in adding their own sample conditioning system
should consult the factory.
The GPR-2000P is equipped with an integral sampling pump positioned upstream of the sensor and generates a predetermined
flow rate of 2 SCFH. This analyzer can also be used in positive pressure applications by simply placing the ON/OFF toggle switch
in the OFF position.
A variety of sample conditioning options are available including coalescing filters, flow meters, etc which are mounted on an
auxiliary panel attached to the side of the analyzer. Advanced Instruments Inc. offers a full line of sample handling, conditioning
and expertise to meet your application requirements. Contact us at 909-392-6900 or e-mail us at