AII GPR-1200/3500 Portable O2 Analyzers

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Portable O2 Analyzers for Gas Purity Monitoring – AII GPR-1200/3500

Easy Trace and Pure Oxygen Measurement


AII GPR-1200/3500 Portable O2 Analyzers high-accuracy portable oxygen analyzers are for applications which must be controlled at several defined measurement points. The GPR-3500 model has a compact, rugged enclosure and includes stainless steel wetted parts, integrated flow meters and needle valves. It measures purity for inert gases, carbon-dioxide and oxygen. The GPR-1200 compact portable trace oxygen analyser features a 4-way valve that traps a gas sample in the sensor. This enables faster oxygen measurement times when moving from point to point in a process and also protects trace oxygen sensors from premature depletion due to exposure to ambient oxygen levels to increase their lifespan. It all adds up to economical operation and low cost of ownership for this market-leading portable oxygen analyzer range.


AII GPR-1200/3500 Portable O2 Analyzers Features:

  • Measurement ranges from 0-10 ppm up to 0-100% O2
  • Accuracy of better than 2% of range
  • 24-32 months sensor life span (in normal use)
  • Up to 30 days battery life
  • Internal pump option
  • 0-1V output
  • XLT sensor options for CO2 backgrounds
  • Rugged industrial enclosures


GPR-1200 MS-2 GPR-1200 GPR-3500 MOVR
Measurement range 0-1, 0-10, 0-100, 0-1000 ppm 0-10, 0-100, 0-1000 ppm, 0-1%
Accuracy < 3% or 10 ppb (whichever is greater) at constant conditions < 2% or 0.2 ppm (whichever is greater) at constant conditions < 2% at constant conditions
Response time T90 <10 seconds T90 <13 seconds
Sensitivity (LDL) 5 ppb 0.05ppm 0.1%
Linearity < 1% of scale
Sensor model GPR-12-2000MS-2 GPR-12-333
XLT-12-333 for gas mixture with > 0.5% CO2
Sensor life at 25ºC (77°F) and 1 atm 24 months in < 100 ppm O2 24 months in < 1000 ppm O2 24 months in 100% O2
Calibration interval 30 days
Inlet pressure 0.34 – 2 barg (5-30 psig) with atmospheric vent 248.2 barg (3600 psig)
Flow rate 0.5 – 1.0 l/m (1-2 SCFH)
Gas connections 1/8″ compression tube fittings
1/4″ compression tube fitting on outlet (GPR-3500-MOVR)
Wetted parts Stainless steel
Display Graphical LCD 7 x 3.5cm (2.75 x 1.375″)
Resolution 0.001ppm 0.01ppm 0.1%
Enclosure Painted aluminum NEMA 4X, 21.8 x 22.9 x 7.6cm (8.6 x 9 x 3″)
Weight 5.4kg (12lbs)
Compensation Barometric pressure and temperature
Signal output 0-1V
LED indicators LOW BATT (72 hr. warning);
Operating temperature GPR sensor: 5°C to 45°C (41°F to 113°F)
XLT sensor: -10°C to 45°C (14°F to 113°F)
Power Rechargeable battery (lead acid)
Battery life Up to 30 days on a single charge (40 hours with pump running, if fitted)
Area classification General purpose (safe area)

Ex ib IIC T4 Gb
Tamb 5°C to +45°C

Additional information


GPR-1200 MS-2, GPR-1200, GPR-3500 MOVR