Analytical Industries Inc (AII) GPR-1500 Specifications

Trace Oxygen Analyzer: sample
panel or wall-mounted

GPR-1500 series

A wall mounted oxygen analyzer in a NEMA enclosure, suitable for indoor or outdoor. This
single channel oxygen meter can be used with flow-through O2 cells for in-line gas analysis
in safe as well as hazardous areas where ATEX approval is needed. The low detection
limit of 0.05ppm offers low oxygen measurement down to a range of 0 to 10 ppm. Ideal
for clean gas applications and when used with the XLT oxygen sensor type it allows
measurement in pure carbon dioxide. The Analytical Industries long-life oxygen sensors
are maintenance-free sealed electrochemical cells that don’t need top up of electrolyte and
can be exchanged in few minutes. .

few minutes. .

PPM

Highlights

• Multiple user-configurable measurement

ranges available

• General purpose or intrinsically safe

(ATEX) models

• Fast recovery from exposure to air

• Can measure in pure CO2 with XLT sensor

• Two alarms with GPR-1500 A

Applications

• Inert gas purity measurements

• Gas quality measurements in double glazing

window manufacturing

• Blanket gas in small vessels

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Sensor Technology

3

4

4

567

3030404505060

70

8

0

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%

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 which has the added benefit of being able to operate in temperatures as low as -10°C.

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GPR-1500 N (ATEX)

General purpose or hazardous area trace oxygen
analyzer with four measurement ranges from 0 to 10
ppm, up to 0-1%. The analyzer consists of a control
unit with HMI and an easily accessible sensor housing
all contained within a NEMA enclosure suitable for
indoor or outdoor mounting. This unit is loop-powered
(18-28 V DC) and provides a 4-20 mA output signal. All
gas wetted parts are stainless steel, the XL T sensor can
be supplied as an option.

GPR-1500 A

This unit is supplied with all of the above features, plus
two user-configurable alarms and the ability to be mains­powered. For safe area use only.

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Technical Specifications

GPR-1500 A GPR-1500 N GPR-1500 N ATEX

Measurement range 0-10, 0-100, 0-1000 ppm, 0-1%, (0-25%)
Accuracy < 2% of selected range at constant conditions
Response time T90 < 10 seconds
Sensitivity (LDL) 0.05 ppm
Linearity <1% of scale

Sensor model

Sensor life at 25ºC (77°F)
and 1 atm

Calibration interval 30 days
Inlet pressure 0.34-2 barg (5-30 psig) with atmospheric vent
Flow rate 0.5-1.0 Nl/m (1-2 SCFH)
Gas connections 1/8" compression tube fittings
Wetted parts Stainless steel
Display Graphical LCD 7 x 3.5cm (2.75 x 1.375"); resolution 0.01

Enclosure Fiberglass NEMA 4X, 6.75 x 8.375 x 4.25“

Weight 3.6kg (8lbs)
Compensation Temperature compensated output Temperature

Signal output

Alarms Two user configurable alarms No alarms

4-20 mA or 1-5 V, optional

Modbus

GPR-12-333 for inert gas streams

XLT-12-333 for gases containing > 0.5% CO

24 months in < 1000 ppm O2

4-20 mA

2

Fiberglass NEMA 4X, 6.75 x

8.375 x 4.25"

GPR sensor: 5°C to 45°C (41°F to 113°F)

Operating temperature

XLT sensor: -10° to 45°C (14°F to 113°F)

Power 12-28 V DC non-loop or 110-220 VAC 18-24 V DC

UL: Class I, Division 1,
Group C, D hazardous areas
with external intrinsic safety

Area classification General purpose

Recovery time 30 seconds in air to < 10 ppm in < 1 hour on N

barrier
ATEX: II 2 G

Ex ia IIB T4 Gb
T

purge

2

-20°C to +50°C

amb

Analytical Industries Inc. 2855 Metropolitan Place, Pomona, CA 91767 USA
Tel: [phone], Fax: [phone], www.aii1.com, e-mail: [e-mail]

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: Trace Oxygen Analyzer for Wall and Panel Installations_partnumber_V2_UK_1018