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TX 1100DRAP 01 20 TX 1100DRAP 02 24 99021 Drawing scaled
Oxygen Deficiency Monitor for Glove Box
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Oxygen Deficiency Monitor for Glove Box

Item : 99021 | Discontinued

Product Summary

The Glovebox Oxygen Deficiency Monitor is designed for small enclosures or vacuum environments using nitrogen or cryogenics. Monitor locations include pharmaceutical facilities, semiconductors, hospitals, universities, and laboratories. The monitor remains accurate in inert environments down to 0% oxygen.

This product is no longer available. It has been replaced with the 99035 – Oxygen Monitor, 0–25% with KF25 Flange.

  • Designed for mounting on Glove Boxes
  • Long life 10 + years average sensor life
  • Two-Alarm Relays for 19.5% and 18.0%
  • No Scheduled Maintenance Required
  • Built-in audible alarm 90 dB
  • 3 Year Warranty
  • No Drift due to Thunderstorms or barometric pressure changes
  • Local display
  • 4-20mA output (Active)
  • UL, C UL, and CE Approvals
  • 24V DC Power Supply Included (99021)
  • International Power Supply Included (99142)

PureAire Monitoring Systems is a leading manufacturer of O2 monitors. We created a better product that eliminates the inconvenience of disposable sensors while continuing to meet your needs. When it comes to O2 deficiency detection, PureAire makes the longest-lasting, most reliable, and affordable oxygen monitors. There are no hidden costs and no replacement of the sensor for 10+ years.

The O2 monitor is used in laboratories using Nitrogen and Argon. It is also used in confined spaces, glove boxes, incubators, gas hoods, cryogenic gas storage, and research and development. PureAire Oxygen Monitors are built with a long-lasting zirconium oxide sensor cell that responds to changing conditions within seconds at temperatures down to -40C.

Easy to operate, the O2 monitor‘s joystick controls an audible alarm with visual alarm indicators. The instrument uses a local display and can be linked to fire alarm systems.

The monitor requires no scheduled maintenance or calibration due to its long-life sensor. Built-in “supervised watchdog” software continuously monitors all instrument functions 24/7. PureAire’s Oxygen Monitor is not affected by humidity, temperature, or changes in barometric pressure. Rapidly changing barometric pressure from thunderstorms will not disrupt PureAire’s oxygen deficiency monitor. The majority of oxygen monitors sold use depleting electrochemical sensors that require frequent maintenance and calibration. PureAire’s Oxygen monitor can save up to $400 annually on replaceable sensors.

Sampling Method Diffusion
Range 0 – 25 %
Accuracy ± 1 % of Full Scale
Operating Temperature -40° to 140°F (-40 to +60 ºC)
Display ¾” backlit LCD digital display
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
Power Requirements 24 VDC
250 mA
Dimensions 7.0(W) x 4.5 (H) x 4.5 (D) inches
177.8 mm x 114.3 mm x 114.3 mm
Weight 1.7 lb
.7 kg
Enclosure Polycarbonate
Calibration Calibration is not required. Periodic span adjustment as needed.
Country of Origin USA
Harmonized Tariff Code 8531.10.0045

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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)

Connects to SCADA and PLC Controls

The Air Check O2 Deficiency Monitor is 24VDC powered and transmits continuous oxygen concentration levels to any system control data acquisition system or programmable logic controller. PureAire’s Oxygen Deficiency Monitor can also be operated remotely up to 1,000 meters or 0.6 miles from centralized controllers.

PureAire’s Oxygen Sensor Cell

The Air Check O2 Deficiency Monitor uses an exclusive Current Limiting Zirconium Oxide Oxygen sensor that never requires a reference gas. Unlike concentration-type zirconium cells that must have a reference gas, PureAire’s O2 monitor can operate in 100% nitrogen environments. Capable of detecting 0% up to 95% oxygen levels, the current limiting O2 sensor operates at a lower temperature than competitive concentration type cells. The average life of PureAire’s O2 sensor is over 10 years in most environments.

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.

O2 Monitor System Features

The Air Check O2 Deficiency Monitor is available in many different configurations. PureAire uses a sophisticated built-in CPU that is flexible to provide users with a low-cost basic display-only monitor or a full-featured monitor with dual-level, user-selectable alarm relays. Other options available are Modbus digital communications or full Wireless radio communications.

Air Check O2 25% DRAP 99021 Glove Box Literature

Air Check O2 25% DRAP 99021 Glove Box Manual

Safety Risks of Oxygen Deficiency 

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

Comparison O2 Zirconium Oxide vs EC cell

Comparison 10 Year Sensor vs Disposable (Electrochemical)

O2 Test Against other Companies

Oxygen Monitor Sales Presentation

Remote Digital Display p/n 99091

Horn/strobe 24VDC Red

horn and strobe

CloudConnect

8-Channel Controller for Oxygen, Carbon Dioxide, or Toxic/Combustible 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.