Measuring Gas Purity with Portable Oxygen Analyzers

The portable oxygen analyzers from Analytical Industries are designed for applications where trace oxygen or gas purity must be regulated at defined measurement points using innovative high accuracy instruments. The Model GPR-3500, housed in a compact yet sturdy enclosure, with stainless steel wetted parts, needle valves, and integrated flow meters offers purity measurement for oxygen, inert gases, and carbon dioxide.

Customers who employ the GPR-1200 compact portable oxygen analyzer know the significance of the four-way valve that allows a gas sample to be captured in the sensor for quicker oxygen measurement times when moving from point to point. This feature also efficiently helps to protect trace oxygen sensors from untimely depletion as a result of exposure to ambient oxygen levels. Longer sensor life-time allows a very cost-effective operation and low cost of ownership for this commercially leading portable oxygen analyzer range.

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

Portable Oxygen Analyzers for Purity Measurements

The portable oxygen analysers use Analytical Industries’ electrochemical sensors for long, reliable operation. Image credit: Analytical Industries Inc.

Technical Specifications

  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% 0-25% 0-100%
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 0.05 ppm 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 25 ºC (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 3.5 cm (2.75 x 1.375")
Resolution 0.001 ppm 0.01 ppm 0.1%
Enclosure Painted aluminum NEMA 4X, 21.8 x 22.9 x 7.6 cm (8.6 x 9 x 3")
Weight 5.4 kg (12 lbs)
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)

UL: Class I, Division 1, Groups C, D

Ex ib IIB T4 Gb
Tamb +5 °C to +45 °C
General purpose only

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