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

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)

Mechanical

Enclosure						Water / dust tight corrosion resistant polyester reinforced fiberglass

Weight						3.4 kg / 7.5 lbs

Size						        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

Display						2x16 character LCD display 
						        LED indicators for "CH1" state, "CH2" state and "FAULT"

SILENCE Push Button				Temporarily clears buzzer / latched relays

Input/Output

Output						One 4-20 mA analog

Relay						        One SPDT dry contact relay rated 5 amps @ 240 VAC

Audible Alarm					Side mounted buzzer, rated 90 dB @ 30 cm / 1 ft

Flow						        Normal operation: 1.0 LPM 
						        Flow alarm: less than 0.5 LPM

Electrical

Power Requirement				24 VAC nominal, 10 W, Class 2

Current Draw					400 mA RMS @ 24 VAC

Wiring						24 VAC 2-conductor shielded minimum 18 AWG stranded within conduit

Fuses						        Thermal, resetting

Environmental

Operating Temperature				-20°C to 40°C (-4°F to 104°F)

Operating Humidity				15 - 90% RH non-condensing

Location						Indoor use only

Certifications

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