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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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34456
7
3030404505060
70
8
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
-
0H
0H
-
0H
-
-
0H
-
-
0H
-
-
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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Common features:
GPR-3100
• Barometric pressure & temperature compensation
• Stainless steel wetted parts
• 4 measurement ranges (manual or auto-selected)
• Range Identification output
• 4-20mA, 0-1V and 0-5V outputs
• 2 off user configurable alarm relays
• Universal mains powered
Options:
• Auto-Zero & auto-calibrations facilities
• Digital communication options
• Relay contacts for range ID
GPR-1600
As standard the GPR-1600 has an integral bypass sample
system. The analyzer can be temporarily exposed to
ambient air to perform a span calibration (20.9% O2).
Options: External bypass system
Heated sample system
Measurement ranges: 0-10 ppm, up to 0-1% O2 (0-
25% for calibration only).
The GPR-3100 is fitted with a temperature controlled
sample handing system to provide an isothermal
environment for the sample for increased accuracy.
Measurement ranges: 0-100% up to 90-100% O
2
GPR-2600
The GPR-2600 is an ideal instrument to monitor oxygen
in applications which involve purging from ambient air to
low percentage levels of oxygen with a variety of gases.
Options: Heated sample system
Measurement ranges: 0-1% up to 0-25% O
2
Installation Options
There are 4 mounting options available for the range
(HxWxD):
• Bench mounting (dimensions: 35.3 x 25.1 x 34cm)
• Panel mounting (dimensions: 19 x 27.4 x 28.6cm)
• 19” rack mounting with optional bezel
(dimensions: 19 x 48 x 72cm)
• Wall mounting (dimensions: 34.6 x 26.7 x 17.8cm)
• Wall mounting W
(dimensions 34.6 x 31.8 x 19.7cm)
• Wall mounting W306
(dimensions 46.4 x 40.7 x 17.2cm)
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Technical Specifications
GPR-1600 GPR-2600 GPR-3100
Measurement range
Accuracy
0-10, 0-100, 0-1000 ppm,
0-1%
0-1%, 0-5%, 0-10%, 0-25%
(0-25% calibration only)
< ±2% of selected range
±0.1% at constant conditions after calibration with 95-100% oxygen (GPR-3100)
0-100%, plus suppressed zero
ranges.
50, 80, or 90-100%
Response time T90 < 10 seconds T90 < 13 seconds
Recovery time
60 sec in air to < 10 ppm in <
1 hour on N
purge
2
Not applicable Not applicable
Sensitivity (LDL) 50 ppb 50 ppm 0.1% oxygen
Linearity < 0.5% of scale
GPR-12-333 GPR-11-32-4
Sensor model
Sensor life at 25°C
and 1 atm
XLT-12-333 for gas mixture
with > 0.5% CO
2
24 months in < 1000 ppm O
XLT-11-24-4 for gas mixture
with > 0.5% CO
2
GPR-11-32-4 32 months;
XLT-11-24-4 24 months
2
GPR-11-120-OP
24 months in 100% oxygen
Calibration interval Typically: 1-3 months
Inlet pressure 0.34 – 2 barg (5-30 psig) with atmospheric vent 248 bar g (3600psig)
Flow rate (constant) 0.5 - 1.0 Nl/min (1-2 SCFH)
Gas connections 1/4" compression tube fittings
Display Graphical LCD 12.7 x 7cm (5 x 2.75”); resolution 0.01
Enclosure
Compensation
See individual mounting options for dimensions
Barometric pressure and temperature;
Temperature controlled sample system and sensor (GPR-3100 only)
Painted aluminum
Analog output 4-20 mA isolated, 0-1V, and 0-5V
Range ID 1-5 V or 4-20mA, optional relay contacts
Communications Choose from RS485, RS232 or USB
Alarms Two user-adjustable alarm relays
Operating temperature
GPR sensor: 5°C to 45ºC (41°F to 113°F)
XLT sensor: -10°C to 45°C (14°F to 113°F)
Power Universal 100-240 V AC
Analytical Industries Inc. 2855 Metropolitan Place, Pomona, CA 91767 USA
Tel: 909-392-6900, Fax: 909-392-3665, www.aii1.com, e-mail: info@aii1.com
Please note: Analytical Industries Inc. adopts a continuous development program which sometimes necessitates specification changes without notice.
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Please contact us for the latest version. Issue No: Industrial Oxygen Analyzers__partnumber_V2_UK_1018
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