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C-Squared O2MONITOR Oxygen (O2) Monitor

SKU: O2MONITOR Rate this product


Availability: 3 In Stock. Usually ships in 8 weeks if not in stock.

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  • Digital display has 0.1% resolution
  • Analyzer is water resistant and sealed
  • Splash proof on/off/on switch (with back light)
  • Internal temperature compensated O2 sensor
  • Low battery warning symbol in left corner of display
  • Ready to use out of the box after checking calibration either in air (20.9%) or 100% O2
  • Complete with a sensor flow cap/restrictor that allows you to read directly from a cylinder valve


  • Range: 0.0% to 100.0 % O2
  • Accuracy: ±1% at full scale
  • Response Time: 90% in <5 Sec.
  • Sensor Type: Galvanic (Electro Chemical)
  • Warranty: 12 Months
  • Stabilization Time: 15 minutes when first installed
  • Battery: 3 AAA 1.5V batteries
  • Operating Temp: 32° to 122° F (0° to 50° C)

C-Squared Oxygen Monitor - P/N: O2MONITOR Includes:

  • Internal O2 Sensor - P/N: D-13
  • Flow Cap/Restrictor
  • (3) AAA 1.5V Batteries
  • Deluxe Black Carrying Case

The C-Squared Oxygen Monitor is designed to measure oxygen levels in the 0.1 to 100.0% range. It can be used to measure the oxygen content for mixes used in Diving, Medical Instrumentation and Industrial applications. The Analyzer is designed to verify oxygen concentration in cylinders as well as analyze delivery systems. This monitor is not designed to be located inside a chamber but external to the chamber only. Sensor can not be exposed to alcohol or acetone.

This Oxygen Analyzer is a durable, compact oxygen analyzer with a user replaceable sensor and three readily available AAA 1.5 volt batteries (included). It has a digital display, an internally or externally mounted temperature compensated sensor with a 2 year life expectancy and an electronic circuit that is easy to calibrate. The electronics and sensor are enclosed in a compact, sturdy, custom molded ABS case. The case, digital panel meter, potentiometer, on/off switch and sensor are sealed and water resistant to protect the electronics inside the enclosure from harsh elements. It is also splash-proof.

The C-Squared Oxygen Analyzer comes with a deluxe carrying case with foam cutouts to protect your investment. It also has room for other items such as the optional remote flow restrictor, batteries, or a sensor. Both enriched air divers and technical divers will truly appreciate the compact size, durability, performance, ease of operation, reliability and sensor life. This Oxygen Analyzer has set a new standard in performance, price and quality for oxygen analyzers for the diving community. It also uses a removable cap with a built-in flow restrictor. Although not necessary, you can also attach a 2-3 lpm flow restrictor to the sensor cap/flow restrictor if desired.

Calibration can be made in air (20.9%) or 100% pure oxygen and takes seconds. Once the sensor is calibrated, analyzing gas is easy. The user simply opens the cylinder valve until a slow, constant hiss is heard, places the sensor cap restrictor over the gas and waits for a constant reading. The case and cap are extremely durable and there are no pliable rings to wear out or parts to break off. The sensor cap/restrictor also has the ability to sense gas remotely with an optional flow restrictor that can connect to a low pressure bc hose.

Changing the sensor or batteries is very easy. When you remove the back of the case, all of the electronics are located on the front half of the case. There are no wires attaching the back to the front that can result in strains on the leads when replacing the sensor or batteries. In limited light conditions and if desired, user can flip on the backlight. The C-Squared Oxygen Analyzer was designed with simplicity in mind. Once out of the box, the average user will be able to sample gas in minutes.

The C-Squared Oxygen Analyzer was built to last and perform ... and it does. It was built for you and there is no doubt you will be extremely pleased with your purchase of this oxygen analyzer.


Additional Information

Search Weight 60
Brand C-Squared
Clearance Item No
Video No

Product FAQ's

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  • Should I use a flowmeter with my Oxygen Analyzer?

    Yes, the manufacturer recommends a flow rate between 2 to 3 liters per minute. If you require a flowmeter, please visit our Visi-Float Flowmeter product page.

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  • How long should my oxygen sensor last?

    The life expectancy of your sensor depends on the concentration of oxygen you are analyzing. However, as a rule of thumb you should replace your sensor every two years or sooner as needed.

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