Explosion-Proof Oxygen Analyzers for the Petrochemical Industries

Explosion-proof oxygen analyzers are employed in petrochemical industries processes that involve hydrogen and other flammable gases. The trace and percent oxygen analyzer comes in a robust Exd enclosure, and upon being integrated with flame arrestors, this oxygen meter is appropriate for hazardous areas.

The industry-proven electrochemical sensor’s oxygen sensitivity enables the measurement of oxygen as low as 0–1 ppm up to 0%–25% O2:

  • Long O2 sensor life of 24–36 months for low maintenance
  • Industry-proven, excellent electrochemical sensor stability
  • High-quality galvanic oxygen sensor technology
  • Four standard measurement ranges
  • Equipped with flame arrestors (standard)
  • No need for frequent electrolyte top-up
  • Accuracy of ±2% of the chosen range
  • Sensitivity of <0.5% of the selected range

Explosion-Proof Oxygen Analyzers (Exd)

Electrochemical Sensors from Analytical Industries have a long lifetime for minimum maintenance.

Technical Specifications

GPR-18 MS-2 GPR-18 GPR-28
Measurement range 0-1 ppm, 0-10, 0-100 ppm & 0-1000 ppm 0-10 ppm, 0-100, 0-1000 ppm & 0-1%
(0-25% for calibration only)
0-1%, 0-5%, 0-10% & 0-25%
Accuracy < 2% of range
Response Time T90 < 20 seconds T90 < 10 seconds
Recovery Time O2 Level: Air
Duration: 30 Sec
O2 Target:10 ppm
Recovery on N2: 45 minutes *
O2 Level: Air
Duration: 2 minutes
O2 Target:10 ppm
Recovery on N2: 60 minutes *
O2 Level: Air
Duration: 30 sec
O2 Target: 0.1%
Recovery on N2: 30 seconds
O2 Level: 9 ppm
Duration:2 minutes
O2 Target: 0.1 ppm
O2 Level: Air
Duration: 2 minutes
O2 Target: 1 ppm
Recovery on N2: 20 minutes **
* Installation
** In service for 2 weeks at 0.1 ppm
Sensitivity (LDL) < 0.5% of range
Linearity < 1% of scale
Sensor model GPR-12-2000MS GPR-12-333
XLT-12-333 (> 0.5% CO2 present)
GPR-11-32
XLT-11-24 (> 0.5% CO2 present)
Sensor life at 25 °C (77 °F) and 1 atm 36 months; average O2 < 100 ppm 24 months; average O2 < 100 ppm GPR-11-32 32 months in air;
XLT-11-24 24 months in air
Calibration interval 1-3 months
Inlet pressure 0.34-2 barg (5-30 psig), max 100 psig; with atmospheric vent
Flow rate 0.5-1.0 l/m (1-2 SCFH)
Gas connections 1/8" or 1/4" compression tube fittings
Wetted parts Stainless steel
Display 3½ digit bright red LED; resolution 0.01 ppm GPR-18, 0.001 PPM GPR-18MS2, 0.001% GPR-28
Enclosure - UL Aluminum 30.4 x 29.2 x 26.7 cm (12 x 11.5 x 10.5”) wall mount, 22.7 kg (50 lbs)
Enclosure - ATEX Aluminum 40.6 x 45.7 x 27.9 cm (16 x 18 x 11”) wall mount, 31.8 kg (70 lbs)
Compensation Temperature
Signal output 4-20 mA isolated and 0-1V
Alarms 2 adjustable form C relay contacts non-latching; sensor and power failure
Operating temperature 5 °C to 45 °C (41 °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)
Power 100/120 or 220/240 V AC
Certifications Conforms to UL: Class 1, Division 1, Groups B, C, D NEMA4/7 hazardous areas (enclosures only) ATEX: EExd d IIB+H2 T6

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