Advanced Instruments Inc.
13
Electronics
The signal generated by the sensor is processed by state of the art low design and integrated circuits. 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 an
isolated 4-20mA and 0-1V signal output jack.
Sample oxygen is analyzed very accurately. Overall performance is enhanced by an optional temperature controlled heater
system that controls the temperature around the sensor. Response time of 90% of full scale is less than 20 seconds on the 0-1
ppm range and on higher ranges (actual experience may vary due to the integrity of sample line connections, dead volume and
flow rate selected).
Power for the on-line analyzers is supplied by an integral power supply. Connections of the appropriate AC line voltage are hard
wired to screw type terminal blocks. Power requirements related to 100/110VAC and 220/230VAC heaters must be specified at
order placement.
Sample Systems
The sample must be properly presented to the sensor to ensure an accurate measurement. The GPR-18MS and GPR-18 are
designed with a sample system consisting of stainless steel and glass wetted parts,a uniquely designed leak tight sensor
housing that has been proven capable of less than 1 ppb oxygen measurements (using the Pico-Ion sensor) and a bypass
sample system that complements the performance (fast recovery from exposure to high oxygen levels) capabilities of the sensor
and enables the user to isolate the sensor from exposure to high oxygen concentrations which results is a substantial increase is
user productivity.
This bypass feature has two important features: one, the sensor can be isolated from exposure to high oxygen levels when
changing sample lines, during transport and during standby intervals; and, two, it enables the user to purge newly connected
gas lines of the oxygen trapped inside. The result is an analyzer that comes on-line at ppb or ppm levels in a matter of minutes
and provides users with a significant increase in productivity.
(26 pages)
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