Starting at $1,441.00
  • Usually ships in 10-12 weeks



  • 0 to 25% measurement range
  • Temperature compensation
  • 0.1% O2 sensitivity (LDL)
  • <1% of scale linearity
  • XLT-11-24-4 sensor option available for gases containing >0.5% CO2
  • Sensor lifespan:
    • 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
  • 4-20 mA output
  • 18-24V DC loop powered
  • Wall mount fiberglass NEMA 4X enclosure
  • Area classification:
    • 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


The AII GPR-2500SN Oxygen Monitor is designed for measuring ambient air in general purpose or hazardous area. It is 18-24V loop powered with ranges of 0 to 1%, 0 to 5%, 0 to 10%, and 0 to 25% O2. The sensor is located at the bottom of the NEMA box and is open to the atmosphere. The XLT-11-24-4 sensor is an available option for use in areas with gases containing >0.5% CO2.


  • Cylinder storage areas
  • Rooms with gas lines
  • Rooms with purged processes or vessels
  • Large chambers that are purged with inert or other gases
  • Confined spaces