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Fixed Percent Oxygen

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• Stand alone desiccant dryers
• Skid / crash frame dryer packages
• Trailer mounted systems
• Pressures to 350 PSI
• -40 deg dew point
• Pneumatic control option
• Water separators with integrated demister pads

(Fixed PPM) Model 7100 – 0 – 2,000 Parts Per Million (PPM) Range Oxygen Analyzer

The Ntron Model 7100 provides an affordable and versatile Oxygen Analyzer solution that’s ideal for high-purity gas manufacturing, high quality welding applications, semiconductor manufacturing applications and any other application that requires precise measurement of oxygen. The unit provides high-purity gas measurement in a range of 0 – 2,000 ppm.

A small footprint and compact size makes the Ntron 7100 easy to install. The unit’s expected operational life is five to ten years. The low-maintenance, long-life Zirconia sensor has virtually unlimited shelf life and will not dry out or freeze.


Sensor:Mini Zirconia Sensor
Measurement Range:0-10PPM/0-100PPM/0-1,000PPM/0-2,000PPM/auto range or fixed range
Display:0.75” (19.05mm) LED digital display, Color coded LEDs for system status, Alarms 1&2= RED, system fault= YELLOW, OK and online= GREEN
Response Time:<15 sec. to 90% step change @ PPM level
Intrinsic Error (accuracy): ±3PPM @ 0-50PPM/±5PPM @ 51-500PPM/±5PPM @ 501-2000 PPM O2 @ STP when calibrated @ target concentration @ STP: ±1% range
Operating Temperature:5-45º C
Signal Interface: RS-232 service port, 4-20mA negative ground, 0-10VDC range ID and choice of 0-1VDC or 0-5VDC or 0-10VDC analog oxygen signal
Alarm Outputs: Two alarms with adjustable form C relay outputs. Configurable for fail-safe or fail-alarm mode, ascending or descending trip. One system fault relay. One alarm/relay for sensor heater OK.
Sample Port:1/8” NPT female ports
Electrical Connections:Removable terminal blocks on back of analyzer
Power, Analyzer:5W at 115/230VAC 50/60Hz, single phase or 12-30VDC (battery backup capability)
Environmental Ratings, Analyzer: Faceplate: NEMA type 4, IP66
Housing: NEMA type 1, IP20
Warranty: Electronics and sensor: One yr.
Weight: Analyzer: Less than 2 lb. (0.9 kg)

Model C5 – Hand held Percent Range Oxygen Analyzer with Internal Pump

The Ntron Model C-5 is a battery powered, handheld oxygen analyzer with internal pump that can quickly provide analysis of 0-25% oxygen with 0.1% resolution.  Rugged and compact enough to be carried in a briefcase or toolbox, the versatile, inexpensive C-5 is equally suited on the production floor, in research labs, or for tuning combustion processes.

The size of a “C” cell flashlight battery, the C-5 oxygen sensor is inexpensive, disposable, and unaffected by most background gases.

The unit features an integral moisture trap and line filter to protect the oxygen sensor from potential contaminants. The inexpensive, disposable oxygen sensor calibrates with ambient air and is simple to replace.  The C-5 is powered by 4 ‘AA’ batteries.


Sensor:Electrochemical fuel Cell
Life: 9-16 mo.
Sensor Guarantee:6 mo. from date of shipment
Calibration Gas:Ambient Air
Calibration Period: Weekly (typical)
Measurement Range: 25% oxygen by volume
Resolution:0.1% oxygen
Display:0.4” LED
Response Time:90% of step change in less than 15 sec.
Intrinsic Error (accuracy):0.2% oxygen
Repeatability:0.1% oxygen
Sampling:Stainless steel sample probe. Integral particulate and condensate filter
Enclosure: Material: Molded High-Impact Plastic
Size: 5.5” x 3.5” x 1.5”
Weight: 1 lb. with sensor cell and batteries
Power: 4 AA alkaline dry cells; Low Battery Warning Light

Model – Compact Portable Parts Per Million (PPM) Trace Oxygen Analyzer With Pump Drive

The Ntron Model 7100P is an affordable solution that’s ideal for spot-checking of high-purity applications.  Multiple analog and RS-232 outputs provide flexibility and the unit is ready to use after only a 2-minute warm-up.

The 7100P is provided with a pump for sampling of gas streams. The flow meter indicates the rate of the sample through the pump and into the analyzer.


Sensor: Mini Zirconia Oxygen Sensor with Integral Heater
Measurement Range: 0-1,000PPM Oxygen (over-range to 1500PPM)
Sample Method:Pump Drive with sample flow meter (includes internal mounted bypass check valve)
Display: 0.75” LED digital display,
Resolution:XXXX.X Color coded LEDs for system status: Alarms 1&2=RED, System Fault=YELLOW, System OK & on-line=Green
Response Time:<15 sec. for 90% response due to step change in PPM Oxygen @ 1 SCFH flow
Accuracy:±3PPM @ 0-50PPM Oxygen (±1ppm with 2nd point cal near measurement point) ±5PPM at 51 500PPM Oxygen ±10PPM at 501-1,000PPM Oxygen
Operating Temperature:32º-113º F (0º-45º C)
Signal Interface:
Serial service port:Bi-directional RS-232 Computer Communications of the following: Oxygen Concentration, Alarm Settings/Status, Fault Status
Analog Outputs:Voltage 0-1VDC or 0-5VDC or 0-10VDC +/- 0.5% @ 1K input min.
Non-isolated:4-20mA: +/- 0.5%, negative ground (loop is powered by analyzer) Maximum loop impedance 500Ω.
Sample Port: 1/8 inch compression tube fitting (1/8” tubing assembly included)
Warm-Up Time:Approximately 2 min. to reach thermal equilibrium with ambient temperature.
Power:9-250VAC, 50/60 Hz, Single Phase 10W
Power Electrical Connections:2 meter power cable, ON/OFF Switch
Storage Temperature:15º to 50º C (5-122º F)
Humidity: 0-95% non-condensing
Sample Flow:1.0 to 2.0 SCFH @ constant pressure
Warranty:Analyzer & sensor: 12 mo. from date of shipment under normal operation
Weight: Less than 5 lb.
Mechanical: Aluminum chassis with carrying handle on top and rubber feet

Our supplier Ntron provides a comprehensive line of gas detection devices, designed to safeguard against a wide range of industrial gas hazards associated with confined space entry, chemical processing and handling, packaging, waste processing, oil & gas production and refining, and food & beverage manufacturing.

Fixed and portable instruments are available, capable of detecting a wide range of toxic gases, VOCs, flammable gases, C02, and O2. Ntron’s fixed detection systems include single and multiple-point configurations.  In the line, there is also a portable gas analyser capable of monitoring up to four gases simultaneously.  A variety of gas monitoring system accessories are also available.

Model SCA – All-in-One General Purpose Gas Controller

The Ntron Model SCA is a stand-alone Gas Detector & Controller for use in industrial and laboratory gas monitoring applications. Featuring a wide range of gas detection capabilities, it can operate as a stand-alone unit but comes ready for direct integration with plant PLC or DCS. It can be configured to detect over 150 flammable and toxic gases, as well as CO2 and Oxygen. An integral sensor is included but the SCA can operate through a remote mounted sensor as well.

The Model SCA features three built-in alarm strobes and an alarm horn. A large, backlit, LCD alphanumeric display makes for easy operation, and external push buttons enable fast calibration & configuration. The unit is housed in a rugged, waterproof, and dustproof steel enclosure, which includes a lockable door.

Ntron Model MCA – Multi-Channel Analyzer

The Ntron Model MCA is a modular, multi-channel analyzer for use in industrial and laboratory gas monitoring applications where more than one gas detector is in use. Standard MCA systems can manage inputs from up to 32 remote Ntron MGT3 or MGT9 gas detectors, and can monitor a wide range of flammable and toxic gases, as well as CO2 and Oxygen. Custom systems are available. The MCA’s internal data logging has the capability of recording up to three months of data storage per channel. A large, backlit LED display and external push-button calibration and configuration make operation simple and straightforward.

The MCA features built-in audible and visible alarms, and comes housed in a rugged, waterproof and dustproof steel enclosure with a lockable door

Ntron Model MGT3 – Intrinsically Safe Gas Detector

The Ntron Model MGT3 is a Certified Intrinsically Safe Gas Transmitter / Display for use in industrial gas monitoring applications. It can be configured to detect a variety of flammable and toxic gases as well as CO2 and Oxygen.

An LCD display and pushbutton operation make the Model MGT3 easy to operate and configure. The unit comes ready for direct integration with plant PLC or DCS. A plug-in sensor design makes maintenance fast and easy. The MGT is housed in a rugged, waterproof, and dustproof enclosure that features a tamper-proof cover

Ntron Model MGT9 – All-in-One Explosion Proof Gas Detector & Controller

The Ntron Model MGT9 is a self-contained Gas Detector & Controller, for use in industrial gas monitoring and control applications. The unit is certified as “explosion proof”. It has three alarms, relays, and built-in local indicators and pushbuttons. It can be configured to detect over 150 flammable and toxic gases, as well as CO2 and Oxygen.
The Model MGT9 is capable of stand-alone control but comes ready for direct integration into plant PLC or DCS. It features a plug-in replaceable sensor for ease of maintenance.

Ntron Model PGA – Intrinsically Safe Portable Gas Monitor

The Ntron Model PGA is a rugged, industrial 4-gas hand-held gas monitoring system. With up to four sensors per analyzer, it can be configured to detect flammable and toxic gases, as well as CO2 and Oxygen. Built-in audible and visible alarms include a 360-degree strobe and a 90dB horn.

The unit features an Intrinsically Safe design internal pump that contributes to the Model PGA’s Intrinsically Safe Certification.
Internal data logging can be downloaded through the PC interface facilitates to enable viewing or printing of data-logging info, instrument configuration, calibration (report printing), and programming. A convenient belt clip and hook is included, and rechargeable or dry battery packs are available.

Modified atmosphere packaging for food and beverage is an application that is perfectly suited to nitrogen generation so given this ideal fit we have paired our generators with WittGas brand gas blenders to enable us to deliver you a turn-key MAP gas solution.  We simply generate a stream of nitrogen with one of our nitrogen generators, feed this flow of nitrogen to the gas blender, feed the blender with a source of Co2 (which we can assist in sourcing for you if required) and the blender delivers a precise mixture of Co2 in N2 according to your requirements right to your process.  The mixer comes fully adjustable so you can simply adjust mixture with a control knob with % scale for infinitely variable mixtures.

Blender features and benefits:

  • High mixing accuracy
  • Easily adjustable mixture to cater for changing requirements
  • Avoids need for multiple and expensive pre-mixed gasses
  • Maintenance free
  • No requirement for tank down stream of the blender


Medical Oxygen and Medical Air – Veterinary

For the ultimate in cost savings and convenience on your medical oxygen and medical air requirements, let On Site Gas Systems design and implement a complete on site generation system for you.

We have the capability to offer both medical air and medical oxygen packages or just medical oxygen packages to suit all requirements.

Medical air is provided at a pressure up to 1100kPa and is to the quality of air stipulated by the European Pharmacopoeia.

On site oxygen generation is the most cost efficient and convenient form of oxygen gas delivery – eliminating your risk of running out of gas, cutting your exposure to gas price increases and delivering you the ultimate in convenience – a never ending supply of gas at the purity, pressure and flow you require, on site, on demand.

Best of all, on site oxygen generation can deliver oxygen for less than 10c per m3, that’s equivalent to only a few dollars per cylinder!

Purity requirements:  USP medical grade Oxygen (for human medical consumption) in the USA has been classed as 93% +/- 3%.  Our systems come in either USP93 (93% +/- 3%), fixed 93%, fixed 95% or even fixed 99% purity so there is a system that will suit your requirement.

photo 2Our systems are compact, come with an integrated oxygen analyser to provide constant monitoring of oxygen purity output and are available with a fail over system to cylinder air and oxygen to offer you 100% back up and total peace of mind.

Oxygen flows start from as littel as 18 LPM with a generator footprint as small as 31cm W x 38cm D x 132cm H so our oxygen generators will fit into the most crowed of facilities.

Systems come with an optional purpose built On Site Gas Systems Medical Gas Alarm Panel which is typically remote mounted inside your ICU or operating theatre.  The alarm panel will indicate if the generated oxygen purity or pressure or medical air pressure falls below your desired set point.

From the company that has FDA approval on portable oxygen generation systems and thousands of systems deployed with the US military for human consumption, you can go no better than an ON Site Gas Systems oxygen generator for your hospital gas needs.

General oxygen generator system capabilities:

Purities: 90%, 93%, 95% and 99%
Flow: 1m3/hr – 100m3/hr from a single system
Pressure:  400kPa

All systems come standard with an integrated touch screen for precision operation and monitoring. The touch screen provides general operating controls as well as an inbuilt oxygen analyser for real time purity monitoring to % O2 level