DCC-MRI Oxygen Sampling System

For monitoring Oxygen (0 - 25% vol range) in MRI Rooms, NMR Labs, TEM Rooms, etc.

Self-contained, single sensor sample draw gas detection system that monitors the Oxygen level in rooms with compressed gas and strong magnetic fields


  • Magnetic Resonance Imaging (MRI) Rooms
  • Nuclear Magnetic Resonance (NMR) Labs
  • Transmission Electron Microscope (TEM) Rooms
  • Freezer Farms (medical)
  • and many more...

Key Features

  • Oxygen sensor 0 - 25% volume (3 year lifespan)
  • 2x16 character LCD display with LED indicators
  • One 5A SPDT dry contact relay
  • One configurable 4- 20 mA output
  • Sample draw pump
  • Adjustable flow meter
  • Blocked flow alarm
  • Loud side mounted buzzer
  • Standard water / dust tight, corrosion resistant enclosure (drip proof)


The DCC-MRI is a self-contained Oxygen sample draw monitoring system is designed for use in rooms where compressed gases are used, such as in MRI and NMR rooms. Compressed gases and cryogenic liquids (usually nitrogen, helium and sometimes carbon dioxide) when dispensed, will displace Oxygen, creating an Oxygen deficient or hazardous atmosphere. Continuous monitoring of the Oxygen levels in these rooms is recommended to ensure the Oxygen levels remain safe and people inside the rooms are alerted in the case of a gas leak situation.

Because the strong magnetic field inside MRI and NMR rooms can interfere with electronic equipment installed inside the room, the DCC-MRI gas detection system is designed to be installed outside the room, with sample tubing running from the monitoring system to the sampled environment. The air in the room is continuously drawn into the device by the sample draw pump, flowing over the sensor and is exhausted through the outlet port. If the Oxygen level drops below a specified set point, the DCC-MRI will go into alarm.

The DCC-MRI comes with an O2 sensor (measurement range 0 - 25% volume), a flow detector, a sample draw pump and an internal adjustable flow meter. Features include one configurable 4 - 20 mA output, one alarm level line voltage relay with field configurable time delays and trigger levels, a blocked flow alarm indicating a dirty filter or clogged tubing, a side mounted audible buzzer and an LCD display with LED indicators for channel alarm status and fault conditions.

This system is accurate enough to measure to government established exposure levels for O2 deficiency for health and safety.

Target Gas
Gas Sensor
Oxygen (O2) (measurement range 0 - 25% vol)
Water / dust tight corrosion resistant polyester reinforced fiberglass
3.4 kg / 7.5 lbs
223 x 267 x 159 mm / 8.8 x 10.5 x 6.3 inches
Tygon Polymer Tubing (sold separately)
1/8" ID x 1/4" OD, clear, 15.24 m / 50 ft roll sold separately (p/n: CET-8000-CMT)
User Interface
2x16 character LCD display
LED indicators for "CH1" state, "CH2" state and "FAULT"
SILENCE Push Button
Temporarily clears buzzer / latched relays
One 4-20 mA analog
One SPDT dry contact relay rated 5 amps @ 240 VAC
Audible Alarm
Side mounted buzzer, rated 90 dB @ 30 cm / 1 ft
Normal operation: 1.0 LPM
Flow alarm: less than 0.5 LPM
Power Requirement
24 VAC nominal, 10 W, Class 2
Current Draw
400 mA RMS @ 24 VAC
24 VAC 2-conductor shielded minimum 18 AWG stranded within conduit
Thermal, resetting
Operating Temperature
-20°C to 40°C (-4°F to 104°F)
Operating Humidity
15 - 90% RH non-condensing
Indoor use only
Conforms to
CSA-C22.2 No. 205-12, UL508 (Edition 17):2007
EMC Directive 2004/108/EC, EN 50270:2006, Type 1, EN61010
FCC. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
RoHS compliant circuit boards
Product Codes
Internal electrochemical 3-year oxygen (O2) sensor (0 - 25% LEL range), LCD display with LED indicators, loud audible alarm, sample draw pump, flow detector with blocked flow alarm, internal adjustable flow meter, one 5A @ 240 VAC SPDT relays, one configurable 4-20 mA output, 24 VAC, water / dust tight enclosure, requires standard Tygon polymer tubing (sold separately)
Standard Tygon polymer clear sample draw tubing, 1/8" ID x 1/4" OD, 15.24 m / 50 ft roll sold separately

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