Analytical Industries Inc (AII) GPR-1600, GPR-2600, GPR-3100 Specifications
Oxygen Analyzers for Industrial Gases
GPR-1600, GPR-2600, GPR-3100
High-accuracy oxygen analyzers for monitoring gas in industrial processes
where trace oxygen from low parts per million to pure O2 has to be precisely
measured. Utilizing AII’s high performance galvanic oxygen sensors these
advanced instruments are simple to use with a common, across-the-range
chassis, HMI and menu structure, so an operator only needs to learn
operation of just one instrument for multiple gas analysis applications
at various oxygen levels. Available as bench-, 19” rack-, panel- and wallmounted for flexible installation.
%
PPM
Highlights
• High accuracy (±0.02ppm in lowest range)
• Four measurement ranges with manual or
auto-ranging
• 24 month sensor life with normal usage
• Sample in CO2 backgrounds with XLT sensor
• Bench, rack or wall mounting options
• Two Alarms
• Integrated bypass valve (for GPR-1600)
• Easy access and sensor replacement
• Easy to use HMI
Applications
• Purity of product in industrial gas manufacture
• Trace oxygen in hydrogen generation by
electrolysis
• Monitoring oxygen generators
• Measuring oxygen in metallurgical processes-
heat treatment and annealing
• Gas measurement in poultry stunners
• Analysis of gas in double glazing manufacture
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Sensor Technology
The sensors from AII have been designed to avoid potential
weaknesses common in typical galvanic cell design. Our
materials, construction and assembly methods have been
continuously refined over decades. Each sensor type
has been specifically engineered to provide the optimum
balance between performance and longevity for individual
applications. The result is confidence in the measurement
and low maintenance. In the absence of oxygen, the
sensor will produce zero output and the sensor is linear
up to 100%, therefore only a span calibration is required
in most cases (see graph).
Membrane
Electrolyte
0202020
0
0
2
2
-
0H
0H
i
-
0H
-
0H
-
0H
-
-
0H
-
0H
-
0H
-
0H
-
0H
Pb0 Pb0
-
0H
0H
0H
0H
0H
0H
02020
2
-
-
0H
-
0H
-
0H
-
-
0H
-
0H
-
0H
-
0H
0
2
0
2
2
-
0H
-
0H
-
0H
-
-
0H
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0H
0H
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0H
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-
0H
-
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0H
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0H
-
0H
Layer
Cathode
Electrolyte
Anode
Sensor Construction
100
90
80
70
60
50
40
30
Oxygen Reading / Output
20.9%
0
20
15.2%
10
15.2%
0
0 10 20 30 40 50 60 70 80 90 100
60.6%
40.0%
40.3%
21.0%
100.2%
100.0%
60.3%
% Oxygen Concentration
Typical sensor output
The Analytical Industries’ XLT sensor
For applications with a background gas containing more than 0.5% CO2, the specially designed XLT sensor should be
selected. With most standard electrochemical sensors an alkaline electrolyte is used and this is neutralised over time
when exposed to acidic gases, such as CO2. To combat this, AII developed the XLT sensor with a special electrolyte
formula and has the added benefit of being able to operate in temperatures as low as -10°C.
Bypass sample system
To protect the sensor when switching sample lines or
during no-flow situations, there is an integral 4-way valv e.
This both extends the life of the trace oxygen sensor
and reduces the time to reach process measurements as
samples with low ppm O2 can be trapped in the cell until
the pipework is flushed.
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