The quality of natural gas in terms of oxygen contamination starts with decreasing wellhead pressure that necessitates the conversion of the well to vacuum extraction to maximize the well’s yield. Contractual limits of 5-50 ppm oxygen contamination are being imposed by customers making oxygen contamination a major concern of the natural gas industry.

As a result producers, transporters and processors alike must now contend with oxygen related problems involving air leakage, corrosion in gathering and transmission lines (air, moisture and hydrogen sulfide react to form sulfuric acid), protection of catalyst and regeneration beds along with field gathering equipment and compressor stations from explosive hazard also impact profits. Oxygen levels are critical to the quality of welds during pipeline construction and repair, and,, to worker safety during the purging of large pipes with inert gases before welding.

Advanced Instruments Inc. offers the most reliable oxygen sensor on the market along with a wide range of on-line and portable analyzers, 2 wire transmitters and sample conditioning systems which reliably measure the level of oxygen contamination and provide the feedback necessary for corrective action which directly impacts a company’s profits.

GPR-1200 Portable ppm Oxygen Analyzer
Proprietary advanced galvanic sensor capable of oxygen analysis under 100 ppb. Meets recognized intrinsic safety (approval pending) standards for use in Class 1, Division 1, Groups A-D hazardous areas. Integral stainless steel bypass sample system. Automated range, zero, calibration, system diagnostic functions. Integral bypass sample system not only extends sensor life but significantly increases operator productivity. Operates on rechargeable battery for 60 days after an overnight charge. Optional integral sampling pump in general purpose and intrinsically safe designs, coalescing filter, H2S scrubber and carrying case. Rechargeable battery operates for 8 hours of continuous pump use after an overnight charge.
Ranges - Standard:  0-10 ppm, 0-100 ppm, 0-1000 ppm, 0-1%, 0-25%

GPR-1100 Portable ppm Oxygen Analyzer
As above, with quick disconnects fittings instead of the bypass sample system and no pump option.   

          .              

GPR-2000 Portable Oxygen Analyzer
Proprietary advanced galvanic sensor capable of oxygen analysis from 0.05% to 100% and 36 months expected life. Meets recognized intrinsic safety (approval pending) standards for use in Class 1, Division 1, Groups A-D hazardous areas. Automated range, zero, calibration and system diagnostic functions. Operates on rechargeable battery for 60 days after an overnight charge. Optional panel mounted flow meter, coalescing filter and carrying case.
Ranges - Standard:  0-1%, 0-5%, 0-10%, 0-25%

GPR-2000 P Portable Oxygen Analyzer
As above, with integral general purpose sampling pump or optional intrinsically safe pump design. Rechargeable battery operates for 8 hours of continuous pump use after an overnight charge.

GPR-1000 ppm Oxygen Analyzer
Proprietary advanced galvanic sensor capable of oxygen analysis under 100 ppm. General purpose design that operates on rechargeable battery for 60 days after an overnight charge. Automated range, zero, calibration, system diagnostic functions.  Stainless steel sensor housing and brass quick release connections. Optional integral sampling pump and carrying case.  Rechargeable battery operates for 8 hours of continuous pump use after an overnight charge.
Ranges - Standard:  0-1000 ppm, 0-1%, 0-25%

AII-3000 A Oxygen Analyzer
Proprietary advanced galvanic sensor capable of oxygen analysis from 0.05% to 100% and 36 months expected life. General purpose. Automated range, calibration and system diagnostic functions. Operates 1,200 hours on 2 AA Alkaline batteries. Optional carrying case.
Ranges - Standard:  0-100%

AII-3000 AHC Oxygen Analyzer
As above, with integral oxygen sensor for hose connection in positive pressure applications.

GPR-1500 AIS ppm Oxygen Transmitter
Operates on 9-28VDC with 4-20mA signal output, two (2) field configurable alarms with programmable time delay and relay contacts. Meets recognized intrinsic safety (approval pending) standards for use in Class 1, Division 1, Groups B, C, D hazardous areas. Proprietary advanced galvanic sensor capable of oxygen analysis under 100 ppb.   Automated range, zero, calibration, system diagnostic functions. Wall, panel or pole mount NEMA 4 configuration. Shown at left with optional H2S Sample System (P/N A-3237).
Ranges - Standard:  0-10 ppm, 0-100 ppm, 0-1000 ppm, 0-1%, 0-25%

GPR-1500 IS ppm Oxygen Transmitter
Configuration and performance equal to GPR-1500AIS above except—operates on two wire 12-28VDC loop power without alarm contacts.

GPR-2500 AIS ppm Oxygen Transmitter
Configuration and performance equal to GPR-1500AIS above except— Ranges - Standard:  0-1%, 0-5%, 0-10%, 0-25%

Configuration and performance equal to GPR-1500AIS above except—percentage ranges, operates on two wire 12-28VDC loop power without alarm contacts.

GPR-1500 ppm Oxygen Transmitter
2 wire loop powered 4-20mA signal output operates on 12-28VDC. Suitable for use in Class 1, Division 1, Groups A-D hazardous areas with optional factory specified intrinsic safety barriers. Proprietary advanced galvanic sensor capable of oxygen analysis under 100 ppb. Automated range, zero, calibration, system diagnostic functions. Wall mount NEMA 4 configuration. Available with optional H2S Sample System (P/N A-3237)
Ranges - Standard:  0-10 ppm, 0-100 ppm, 0-1000 ppm, 0-1%, 0-25%

GPR-1500 D ppm Oxygen Transmitter
As above. Ranges - Standard:  0-100 ppm, 0-1000 ppm, 0-1%, 0-25%

GPR-2500 AIS Oxygen Transmitter
As above. Ranges - Standard:  0-1%, 0-5%, 0-10%, 0-25%

GPR-15 XP ppm Oxygen Transmitter
Two wire loop powered 4-20mA signal output operates on 12-28VDC. Enclosure and flame arrestors certified for use in Class 1, Division 1, Groups C, D. Proprietary advanced galvanic sensor designed for ppm oxygen analysis above 2 ppm. Manual range and calibration functions. Wall mount NEMA 4 configuration.
Ranges - Standard:  0-100 ppm, 0-25%

GPR-25 XP Oxygen Transmitter
As above. Ranges - Standard:  0-5%, 0-25%

GPR-15 AXP ppm Oxygen Transmitter
Operates on 9-28VDC with 4-20mA signal output and two (2) field configurable alarms with relay contacts. Enclosure and flame arrestors certified for use in Class 1, Division 1, Groups C, D. Proprietary advanced galvanic sensor designed for ppm oxygen analysis above 2 ppm. Manual range and calibration functions. Wall mount NEMA 4 configuration.
Ranges - Standard:  0-100 ppm, 0-25%

GPR-25 AXP Oxygen Transmitter
As above. Ranges - Standard:  0-5%, 0-25%

B-3251 H2S Scrubber System

GPR-1500 with A-3237 H2S Scrubber System

Advanced Instruments Inc. offers a complete line of efficient hydrogen sulfide (H2S) scrubbers and sample conditioning systems for:

Preparing a gas stream containing H2S for oxygen analysis

Zero gas generation for H2S transmitters

The scrubber media selectively removes H2S and other oxidizing gases from the gas stream that can interfere with the oxygen measurement.

As an indication the scrubber is nearing the end of its useful life the media changes color from purple to orange to brown to white as it is consumed.

Scrubbers are available in refillable:

1.0” x 6”   (P/N B-2734-6) plexi-glass container with SS connections

1.5” x 12” (P/N B-2734) plexi-glass container with SS connections

2.0” x 24” (P/N A-2839) stainless steel container with SS connections

2.5” x 24” (P/N B-3247) plexi-glass container with SS connections

They can be installed in-line or as part of a complete scrubber sample conditioning system. More elaborate custom designed scrubber sample conditioning systems can include dual scrubbers and valve system that can eliminate downtime. Operators simply switch the gas flow to the fresh scrubber while servicing the other one.

Specifications:

Inlet connections:            1/4” SS tube fitting (refill port)

Outlet connections:          1/4” SS tube fitting

Pressure rating:               30 psig maximum

Temperature:                  -20ºC to 45ºC (-4ºF to 113ºF)

Application conditions:      Free of moisture (may require coalescing filter) 

Materials of construction:  Clear acrylic and/or stainless steel

Scrubber life:                   Function of sample flow rate, media volume

                                      and H2S concentration