Fixed Ambient Oxygen Deficiency Monitors with Alarms

GPR-35, GPR-2500 SN (ATEX), GPR-2800 IS

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.


Product Features

  • Low maintenance with typically 32 months oxygen sensor life
  • Audible and visual oxygen deficiency alarm available
  • Up to four measurement ranges
  • Accuracy of <2% of span
  • Mains power with battery back-up (GPR-35)
  • Remote oxygen sensor & pump options (GPR-35)
  • Analog output for connection to DCS
  • 12-28 V DC operation (GPR-2500 versions)

Technical Specifications


GPR-35 GPR-2500-S GPR-2800-IS/AIS-S
Measurement Range 0-25% 0-25% 0-25%
Accuracy < 2% of range at constant conditions
Response time T90 < 10 seconds
Sensitivity (LDL) 0.1% O2
Linearity (LDL) < 1% of scale
Sensor model GPR-11-32-RTS GPR-11-32-4
XLT-11-24-4 for gases containing >0.5% CO2
Sensor life at 25ºC (77°F) and 1 atm 32 months in air GPR-11-32-4 32 months in air 5°C and 1 atm
XLT-11-24-4 24 months in air 5°C and 1 atm
Calibration interval 30 days
Inlet pressure Atmospheric sampling
Gas connections None
Display 3½ digit LCD; resolution 0.1 LCD 7 x 3.5cm (2.75 x 1.375"); resolution 0.1%
Enclosure Painted aluminum, suitable for indoor use only Fiberglass NEMA 4X Fiberglass NEMA 4X,
plus painted aluminum Exd enclosure
Dimensions 10.1 x 22.8 x 7.6cm (4x9x3") 17.1 x 21.3 x 10.8cm (6.75 x 8.375 x 4.25") 25.3 x 40cm (10 x 15.7")
Weight 3.6kg (8lbs) 6.5kg (14.6 lbs)
Compensation Barometric pressure and temperature (GPR-35 and GPR-2800 AIS S)
Temperature (GPR-2500 and GPR-2800 IS S)
Signal output 0-1V 4-20 mA (or 1-5V on GPR-2800 AIS)
Alarms Two adjustable SPDT Form C non-latching relay contacts None Two user-configurable alarms magnetic coil
relays rated 3A at 100 V AC (AIS only)
Operating temperature G0°C to 45°C (32°F to 113°F) GPR sensor: 5°C to 45°C (41°F to 113°F)
XLT sensor: -10° to 45°C (14°F to 113°F)
Humidity Non-condensing up to 95% RH
Power 100-240 V AC with battery back-up (battery life up to 30 days or 8 hours in alarm mode) 18-28 V DC 18-24 V DC (IS model)
18-24 V DC or 110 to 220 V AC (ATEX AIS only)
Area classification General purpose CSA/NRTL approved General purpose or with external safety barrier MTL-7706 or equivalent
ATEX: II 2 G
Ex ia IIB T4 Gb
Tamb -20°C to +50°C
ATEX: II 2 G
Ex d [ib] ib IIB Gb T4
Tamb -20°C to +45°C

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