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Oxygen Deficiency Monitor with Remote Sensor for Inert Gas Safety 99028 Remote DRA Drawing remote display wiring D with parts Rev D 82521
Oxygen Deficiency Monitor with Remote Sensor
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Oxygen Deficiency Monitor with Remote Sensor

Available Product Options. Please choose from the menu below | In stock

$2,295.00 – $2,660.00

Product Summary

Oxygen deficiency monitor with remote sensor is engineered for facilities that utilize inert gases such as nitrogen, helium, and argon, where the risk of oxygen displacement can pose serious safety threats. The remote sensor extends monitoring capability up to 30 feet from the main unit, making it ideal for cryogenic freezers, storage tanks, and confined spaces where personnel may be exposed to invisible asphyxiation hazards. Whether in low-traffic zones or hard-to-access mechanical rooms, this oxygen deficiency monitor with remote sensor delivers uninterrupted protection and peace of mind.

The monitor features a non-depleting zirconium oxide sensor that operates for over a decade without replacement or scheduled maintenance, even in environments as cold as -40°C. Trusted across industries such as pharmaceutical manufacturing, semiconductor fabrication, food and beverage processing, chemical storage, aerospace, and additive manufacturing, the oxygen deficiency monitor with remote sensor ensures continuous monitoring with minimal maintenance. In environments where inert gases are used in enclosed areas, PureAire’s monitor provides essential, around-the-clock safety.

Two-Year Extended Warranty Available for this product in the US, Canada, and Mexico
  • Long life, 10+ year average sensor life
  • Two, user-adjustable, alarm relay setpoints are available or alarm defaults are set to 19.5% and 18.0%
  • No Scheduled Maintenance Required
  • Built-in audible alarm 90 dB
  • Remote sensor capability up to 30 feet
  • 3 Year Warranty
  • Digital Display
  • 4-20mA Analog Output (Active)
  • Operates in Freezers at – 40 ºC
  • No Drift due to Thunderstorms or barometric pressure changes
  • Wall mounting brackets
  • UL, CUL Approvals
  • 24V DC Power supply included

The oxygen deficiency monitor with remote sensor features a high-performance zirconium oxide oxygen sensor, designed for rapid detection of oxygen deficiency and long-term operation in demanding environments. This sensor responds to low oxygen levels within seconds and maintains accurate readings across a wide temperature and humidity range. Unlike disposable sensors that degrade over time and require frequent replacement, the zirconium sensor runs maintenance-free for over 10 years, offering unmatched reliability and peace of mind.

There are no zero or span calibration adjustments required, significantly reducing downtime and labor costs. When compared to traditional disposable-type sensors, facilities using an oxygen deficiency monitor with remote sensor can save up to $475 annually—making this a cost-efficient solution that typically pays for itself in just over three years.

For environments that use nitrogen, helium, or argon in confined spaces, an oxygen deficiency monitor with remote sensor provides critical, continuous protection. Understanding oxygen exposure thresholds in confined spaces is essential when choosing the right monitoring system for your facility.

Sampling Method & Range Diffusion, 0-25% O2
Accuracy Delivers± 0.2% O2 accuracy (± 1% of full range)
Operating Temperature -40° to 140°F (-40 to + 60° C)
Display ¾” backlit LCD digital display
Sensor Type Long-life zirconium oxide sensor cell.
Sensor Life</b> 10+ years under normal conditions
Signal Outputs 4-20 mA analog output (Active)
Dual User Selectable Relays (2amp 30VDC / 240VAC), Audible horn
Please contact PureAire for the available RS-485 option
Power Requirements 24VDC 250mA
Dimensions 6.5 (W) x 4.5 (H) x 3.25 (D) inches; (165.1 x 114.3 x 82.5 mm)
Weight 1.6 lbs.(.8 kg)
Enclosure Polycarbonate
Approvals Ce approval & factory calibrated against a NIST traceable reference standard
Calibration Calibration is not required. Periodic span adjustment as needed.
Country of Origin USA
Harmonized Tariff Code 8531.10.0045
Additional O2 Monitor Accessories List Price
8 Channel Controller US (P/N # 99196)
Horn and Strobe  US (P/N # 42002)
Remote Display US (P/N # 99091)

One-Step Sensor Adjustment

PureAire Oxygen Deficiency Monitors require occasional testing with nitrogen to validate the sensor’s response to low oxygen levels. While calibration is not necessary for our monitors to accurately measure oxygen depletion levels1, annual fine-tuning might be needed to ensure the sensor’s span accurately corresponds to the standard 20.9% oxygen concentrations.

PureAire’s Auto-Span not only simplifies the process of adjusting the span of the oxygen sensor but also provides a quick check of the sensor and the monitor’s response to an oxygen-deficient atmosphere. With a press of a button, this feature saves you time and money, protects your facilities and employees, and, most importantly, provides you with the reassurance of consistently reliable performance, making it a valuable addition to your safety measures.

1Please follow your facility’s safety guidelines and state and local regulations regarding calibration requirements for safety equipment.

Connects to SCADA and PLC Controls

The AirCheck O2 Deficiency Monitor checks oxygen concentration levels and transmits readings to any programmable logic controller or system control data acquisition system. The O2 sensor can work with your existing equipment to save on implementation costs. The AirCheck O2 Deficiency Monitor may be operated remotely via a centralized controller at distances of up to 1,000 meters (0.6 miles), for flexibility.

No Reference Gas Necessary

Oxygen monitors that use a concentration-type zirconium cell require a reference gas to work properly, but the Air Check O2 Deficiency Monitor provides reliable readouts with no reference gas. Unlike oxygen sensors from other manufacturers, PureAire’s monitors can be used in 100 percent nitrogen environments and at lower temperatures. The AirCheck O2 Deficiency Monitor can detect oxygen levels from 0 to 25 percent with no calibration and no scheduled maintenance for a period of 10 years or longer.

 

O2 Deficiency Monitor Remote Sensor 0-25% Literature

O2 Deficiency/Diffusion Monitor – Manual – Rev 5.01 (Post Summer 2023)

Safety Risks of Oxygen Deficiency

NIH – Protocol for Use & Maintenance of Oxygen Monitoring Devices 2021

Comparison of annual maintenance

 

Remote Digital Display p/n 99091

Horn/strobe 24VDC Red

horn and strobe

CloudConnect

8-Channel Touch Screen Programmable Controller for O2 or Gas Monitors

O₂ Safety Monitoring

Helps identify oxygen displacement risk where inert gases are used or stored.

Facility-Ready Design

Built for continuous operation in industrial and laboratory environments.

Configuration Options

Available in multiple configurations to match installation and communication needs.

Long-Term Reliability

Engineered for dependable, long-term monitoring in critical spaces.

Oxygen deprivation is a silent killer. Oxygen-depleting gases, such as nitrogen, argon, and helium, are odorless and colorless, making leaks impossible to detect, unless appropriate monitoring is in place.

PureAire oxygen deficiency monitors can be used to monitor nitrogen, argon, and helium. Carbon dioxide can also be monitored with PureAire’s dual oxygen/carbon dioxide monitor.

PureAire uses a proprietary, non-depleting, zirconium oxide sensor that will last up to 10 years in a normal environment without needing to be replaced.

PureAire’s sensors do not operate under partial pressure, meaning that a PureAire sensor will not need to be adjusted to account for different elevations. Additionally, the sensors will not drift due to changes in barometric pressure.

In contrast, other gas detection companies use depleting, electrochemical sensors. These sensors, because they are depleting, operate for 1-2 years before needing to be replaced. Electrochemical sensors do not offer long-term solutions to companies committed to safety.

PureAire sensors are built to last 10 years. Often, the sensors work much longer. In fact, some of our first customers who started using PureAire products in 1997 report that the sensors are still in operation today.

On the other hand, an oxygen monitor that uses a depleting, electrochemical sensor is like a battery in that, as the sensor depletes, it begins to lose its power and responsiveness. In order to operate accurately, electrochemical sensors must be calibrated frequently.

PureAire sensors are made of non-depleting zirconium oxide, and calibration is typically not required.

However, a visual check of the monitor should be done once a year to verify that the sensor is functioning properly, and span adjustments should be done, as necessary. The sensor requires periodic testing with nitrogen to verify the sensor’s response to low oxygen levels.

In contrast, electrochemical sensors, because they deplete over time, will need to be calibrated every 2-3 months and totally replaced every 1-2 years.

Switching to a PureAire non-depleting, zirconium oxide sensor will save you time and money, while ensuring the safety of your workers and facility.

Electrochemical sensors offered by other gas detection companies lose accuracy over time and must be calibrated. Calibration recharges and resets the monitor to get an accurate reading. It is important to note that an electrochemical sensor can only be calibrated a finite number of times before it must be discarded.

PureAire’s non-depleting zirconium oxide sensor will not experience drift. Oxygen sensors from PureAire will provide long-lasting, reliable, and accurate monitoring for an average of10+ years.

The oxygen monitor covers an area of approximately 692 square feet when mounted on a wall and should be placed no more than 21 feet from potential leak sources such as gas lines, gas cylinders, or any areas where a gas leak might be expected to occur.

To ensure safety, the maximum distance between two monitors mounted to the same wall, should not exceed 30 feet. However, since cryogenic gases, such as argon, helium, and nitrogen, are unpredictable, we encourage you to contact PureAire for additional guidance specific to your needs.

In most circumstances, PureAire recommends that oxygen monitors be installed 3-5 feet away from gas cylinders or cryogenic gas lines. To enable employees to see the monitor display and verify its performance, PureAire recommends mounting an oxygen monitor 3-5 feet off the ground.

There are other options for mounting an oxygen monitor. For instance, PureAire sensors can sample the air from up to 100 feet away, or be installed within a glovebox, freezer, sealed chamber, or even underground. PureAire monitors can also work in environments that require KF-25 flanges, as well as in nitrogen/argon enriched environments.

PureAire’s Sample Draw Monitors pull a sample flow at a rate of 250 ccs per minute. We recommend using 1/4” OD x 3/16” ID polypropylene sample tubing. Using this internal tubing dimension, to calculate transport (response) time, add 2 seconds per foot of sample tubing. For example, if the sample tube is 10 feet long, the initial response time would be 20 seconds (10ft x 2seconds=20seconds) at 15 feet the response time would be 30 seconds (15ft x 2seconds=30seconds), etc.

The response time when using the entire 100 feet of sample tube will take 3.5 minutes (100ft x 2seconds=200seconds or 3.5minutes) for the sample to reach the monitor.