GPR-18 MS ATEX Explosion Proof PPB Oxygen Analyzer.

Advanced Instruments Inc.ElectronicsThe signal generated by the sensor is processed by state of the art low design and integrated circuits. The first stage amplifiesthe signal. The second stage eliminates the low frequency noise. The third stage employs a high frequency filter andcompensates for signal output variations caused by ambient temperature changes. The result is a very stable signal. Sampleoxygen is analyzed very accurately. Response time of 90% of full scale is less than 10 seconds (actual experience may vary dueto the integrity of sample line connections, dead volume and flow rate selected) on all ranges under ambient monitoringconditions. Sensitivity is typically 0.5% of full scale low range. Oxygen readings may be recorded by an external device via anisolated 4-20mA and 0-1V signal output jack.Sample oxygen is analyzed very accurately. Overall performance is enhanced by an optional temperature controlled heatersystem that controls the temperature around the sensor. Response time of 90% of full scale is less than 20 seconds on the 0-1ppm range and on higher ranges (actual experience may vary due to the integrity of sample line connections, dead volume andflow rate selected).Power for the on-line analyzers is supplied by an integral power supply. Connections of the appropriate AC line voltage are hardwired to screw type terminal blocks. Power requirements related to 100/110VAC and 220/230VAC heaters must be specified atorder placement.Sample SystemsThe sample must be properly presented to the sensor to ensure an accurate measurement. The GPR-18MS and GPR-18 aredesigned with a sample system consisting of stainless steel and glass wetted parts,a uniquely designed leak tight sensorhousing that has been proven capable of less than 1 ppb oxygen measurements (using the Pico-Ion sensor) and a bypasssample system that complements the performance (fast recovery from exposure to high oxygen levels) capabilities of the sensorand enables the user to isolate the sensor from exposure to high oxygen concentrations which results is a substantial increase isuser productivity.This bypass feature has two important features: one, the sensor can be isolated from exposure to high oxygen levels whenchanging sample lines, during transport and during standby intervals; and, two, it enables the user to purge newly connectedgas lines of the oxygen trapped inside. The result is an analyzer that comes on-line at ppb or ppm levels in a matter of minutesand provides users with a significant increase in productivity.12