Please note, most links within this site now redirect to Process Sensing Technologies for the most up to date information.


The GPR-1800 series of intrinsically safe trace oxygen analyzers are designed for use in demanding process environments where the low detection limit down the AII’s industrial oxygen sensors can be well utilized. Typical for Analytical Industries gas analyzers, they are simple to use as well as easy and cost-effective to maintain thanks to the use of their maintenance-free galvanic oxygen sensors. The innovative liquid drain manifold, which is available as an option, protects and extends the sensor's life span in processes where liquids may be present in the sample gas.

Features of Trace Oxygen Analyzer for Process Industries

  • Four measurement ranges provided
  • LDL of 50 ppb
  • Measures in CO2 with XLT sensor
  • Sensor life of up to 24 months
  • Simple, intuitive HMI
  • Barometric pressure and temperature compensation
  • Two user configurable alarms
  • Optional Modbus
  • Range of sampling options available

GPR-1800 IS GPR-1800 AIS
Measurement range 0-10, 0-100, 0-1000 ppm, 0-1%,
0-25% (for calibration only)
Accuracy < 2% of selected range at constant conditions
Response time T90 < 10 seconds
T90 < 2 minutes (for Liquid drain models)
Sensitivity (LDL) 0.05ppm
Linearity <1% of scale
Sensor model GPR-12-333 or GPR-12-333-LD
XLT-12-333 or XLT-12-333-LD for gases containing > 0.5% CO2
Sensor life at 25ºC (77°F) and 1 atm 24 months in < 1000 ppm O2 5°C (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 l/m (1-2 SCFH)
Gas connections 1/8" compression tube fittings
1/4" compression tube fittings (with liquid drain option)
Wetted parts Stainless steel
Display Graphical LCD 7 x 3.5cm (2.75 x 1.375"); resolution 0.01 ppm
Enclosure UL: NEMA Type 3R
Compensation Temperature Barometric pressure and temperature
Signal output 4-20mA Loop current 4-20 mA or 1-5V
Communications NA Optional Modbus RTU (AIS 24 V version only)
Alarms NA Two user configurable alarms: magnetic coil relays rated 3A at 100 VAC
Operating temperature GPR sensor: 5°C to 45°C (41°F to 113°F)
XLT sensor: -10° to 45°C (14°F to 113°F)
Power 18-24 V DC 2wire loop power 12-28 V DC or 110-220 V AC
Liquid Drain Liquid Drain option available for both models
Approvals CULUS: Class I, Division 1, Groups C & D
Tamb -20° to +50°C
Ex d [ib] ib IIB T4 Gb

GPR-1800 IS, GPR-1800 AIS

* These fields are required.


CALL 909-392-6900
Analytical Industries Inc.
2855 Metropolitan Place,
Pomona, CA, 91767
What we do
Analytical Industries Inc manufactures high-quality electrochemical oxygen sensors and gas analyzers for industrial process control as well as breathing air for diving and medical treatment.