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Oxygen Deficiency Monitor, 0-25%
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Oxygen Deficiency Monitor, 0-25%

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

$2,175.00

Product Summary

PureAire’s Oxygen Deficiency Monitor provides reliable, long-term protection in environments where inert gases such as nitrogen, carbon dioxide, helium, and argon are used or stored. With a measurement range of 0–25% O₂, this monitor helps safeguard personnel from oxygen displacement and asphyxiation risks in high-risk locations such as pharmaceutical manufacturing facilities, cryogenic storage rooms, food and beverage processing plants, universities and research labs, semiconductor cleanrooms, and additive manufacturing environments. Its robust design makes it especially well-suited for confined spaces and areas where gas leaks could go undetected without continuous monitoring.

Engineered for ultra-low-temperature environments down to -40°C, the monitor features a non-depleting zirconium oxide sensor that delivers accurate readings for 10+ years with no scheduled maintenance or replacement. Backed by a 3-year warranty, the unit ensures 24/7 operational safety in demanding conditions.
See Video: What is an Oxygen Deficiency Monitor?

 

 

We can ship next day with orders placed by Noon CST
Quantities less than 10 pieces ship next day. Estimated lead times do not include weekends or holidays. Transit time is determined by shipping method and destination. Orders requiring credit information might take additional time.
Two-Year Extended Warranty Available for this product in the US, Canada, and Mexico

O2 Deficiency Monitor Features

  • 10 + Years Sensor
  • Two, user-adjustable alarm relay setpoints available or alarm defaults are set to 19.5% and 18.0%
  • No Scheduled Maintenance Required
  • Built-in 90db audible alarm
  • 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, and CE Approvals
  • 24V DC Power Supply Included (99016)
  • International Power Supply Included (99116)

Long-Lasting O2 Zirconium Sensor

Oxygen deficiency monitors are devices designed to measure the oxygen concentration in the ambient air and provide a real-time oxygen reading.  The PureAire Oxygen Deficiency Depletion Monitor features a long-lasting zirconium oxide sensor capable of providing accurate readings for 10+ years with no scheduled maintenance, and the Monitor comes with a full 3-year warranty.

What is an O2 Deficiency Monitor?

PureAire’s O2 Deficiency Monitor is suitable for a wide range of uses. From bars and restaurants to tire repair centers, food processing plants, laboratories, and hospitals, our Oxygen Monitors ensure that nitrogen and CO2 gas are safely used and that any leaks are detected before human safety is jeopardized.  Our zirconium O2 sensor performs reliably in temperatures ranging from 60 Celsius to -40 Celsius, so it’s ideal for environments including freezers, cryogenic facilities, and frozen food manufacturing plants. The low-maintenance and long-lasting sensor provides continuous monitoring in applications in which inert nitrogen gas and CO2 gas are stored.  Once set up, the O2 zirconium sensor will operate continuously. So long as everything is operating properly, the Monitor stays silent, but if oxygen levels fall to the OSHA action level, defined as 19.5%, the Monitor’s built-in horn will sound, alerting employees to danger.

Sampling Method Diffusion
Gases Detected Oxygen (O2) Deficiency Monitor
Range 0 – 25 % O2
Accuracy Delivers ± 0.2% O2 accuracy (± 1 % of Full Range)
Operating Temperature -40º to 140ºF (-40º to 60ºC)
Display 3/4″ LCD Digital Display, Back Lit
Sensor Type Long-life zirconium oxide sensor cell
Sensor Life > 10 years under Normal Conditions
Signal Outputs 4-20 mA Analog Output (Active)
Dual-Level Alarm Relay Contacts
Please contact PureAire for the available RS-485 option
Power Requirements 24 VDC
250 mA
Width  5.12 in
130.1 mm
Height 4.5 in
114.3 mm
Depth 3.25 in
82.1 mm
Weight 1.6 lb
0.8 kg
Enclosure  Polycarbonate
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.

Plug & Play Setup

PureAire’s O2 Deficiency Monitor mounts in minutes, and it is ready to go right out of the box. Simply mount the unit on the wall in a location where oxygen needs to be monitored, plug it into the power supply, and power on the unit. After four minutes, the Monitor will begin sampling oxygen levels, which are continuously displayed on the Monitor’s screen, ensuring readily available observation at all times. Our customers appreciate a reliable oxygen sensor that is easy to use and read, and that operates 24/7, with no oversight or scheduled maintenance necessary, for up to 10 years.

PureAire O2 Deficiency Monitor Features

To suit the needs of the user, the PureAire O2 Deficiency Depletion Monitor comes in a range of configurations. Every unit comes with a full-featured, dual-level monitor, options for alarm relays, and hysteresis to account for supply valves for CO2 and nitrogen. All units have a built-in CPU that houses the monitor, display, and alarm

Oxygen Deficiency Monitor 0-25% Literature

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

Safety Risks of Oxygen Deficiency

NIH -Protocol for Use and Maintenance of Oxygen Monitoring Devices 2021

Oxygen Monitor Sales Presentation

Calibration and Repeatability Testing 0-25%

DRA case drawing

Price Savings for PureAire Sensor vs Disposable Sensors

Comparison O2 Zirconium Oxide vs EC cell

Oxygen Monitor for horn/strobe or remote display

Connecting Multiple O2 Monitors to a Controller

Fire code Section 5309 Inert Gas Systems Used in Commercial

Remote Digital Display p/n 99091

Horn/strobe 24VDC Red

horn and strobe

CloudConnect

8-Channel Touch Screen Programmable Controller for Oxygen, Carbon Dioxide, or Toxic/Combustible Gas Monitors

What is an Oxygen Deficiency Monitor? Did You Know PureAire Lasts 10 Years.
What is an Oxygen Deficiency Monitor? Did You Know PureAire Lasts 10 Years.
Reliable Protection

Continuous 0–25% O₂ monitoring helps alert personnel to oxygen-displacement hazards.

Built for Extreme Conditions

Engineered for ultra-low temperatures down to –40°C for demanding environments.

Long-Life, Low Maintenance

Non-depleting zirconium oxide sensor delivers drift-free performance for 10–20 years without calibration or replacement.

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.