Winn-Marion Companies

Not your AVERAGE Representative Firm

Automation Service

Automation Service

  • Turnkey Automation
  • Network Design
  • Solar Packages
  • Calibrations
  • Pressure Control
  • Learn more about Automation Services at Winn-Marion

Controls Integration

Controls Integration

  • Emissions Monitoring
  • Analyzers
  • Speed & Load Control
  • Engine Control
  • Governor Upgrades
  • Learn More About Controls Integration Services at Winn-Marion

Sales, Assembly & Repair

Controls Integration

  • Heat Tracing
  • ESD Valves
  • Valve Assembly
  • Flow Meters
  • Recorders
  • Learn More About Products, Assembly, Repair at Winn-Marion

Advanced Instruments, Inc. (AII) Products

Natural Gas Online Analyzer


AII GPR-1500 Trace PPM Oxygen Analyzer

Advanced Instruments' (AII) GPR-1500 AIS-LD ATEX Trace PPM Oxygen Analyzer is designed exclusively for natural gas applications (oxygen analysis in inert, hydrocarbon, helium, hydrogen, mixed and acid (CO2) gas streams). This natural gas online analyzer features an innovative sample system that efficiently removes large amounts of free liquids from gas streams. It is an advanced galvanic trace PPM oxygen sensor capable of precisely measuring oxygen concentrations ranging from 100PPB - 1% over a 24-month operating life, menu driven controls, and two field selected alarm set points.


  • Accuracy: less than 2% of FS range under constant conditions
  • Meets the recognized intrinsic safety standards for use in Class 1, Division 1, Group C, D hazardous areas
  • Two user configurable alarms: magnetic coil relays rated 3A at 100 VAC
  • Field programmable alarm time delays; alarm bypass for calibration and system fail alarm
  • Calibration: air or certified span gas of O2 balance N2 approximating 80% of range above analysis range recommended
  • Controls: Water resistant keyboard; menu driven range selection, calibration and system functions
  • Enclosure: Aluminum ex-proof, fiberglass NEMA 4X, 16x9x6", 20 lbs.
  • Pressure: Inlet - regulate to 5-30 psig to deliver 1-2 SCFH flow; vent - atmospheric
  • Power: 12-24 VDC (suitable for solar power systems) or 100/230 VAC

Winn-Marion Locations

Contact Us at any of the Winn-Marion Locations:
Denver, CO - 303.778.6767
Salt Lake City, UT - 801.676.0155 | Phoenix, AZ - 480.968.9344 | Billings, MT - 406.259.9234 | Pittsburgh, PA - 412.319.7392
Roosevelt, UT - 435.725.0082 | Farmington, NM - 505.326.4069 | Evans, CO - 970.339.9211 | Gillette, WY - 307.686.9196 | Arnegard, ND - 701.586.3184