Sentech Ancillary Refrigerant Monitors



  • 1 Zone, 3 Alarm levels
  • 4 Zone, 3 Alarm levels
  • 8 Zone, 3 Alarm levels
  • 16 Zone, 3 Alarm levels


Sentech Ancillary Refrigerant Monitors


(Sentech IR-SNIF-MCD Refrigerant Monitors, replaces the IR-SNIF-A Refrigerant Monitors)

Sentech Ancillary Refrigerant Monitors are advanced multi-point refrigerant detection systems designed for highly reliable performance. They have the flexibility to satisfy a wide range of continuous monitoring applications. Sentech refrigerant monitors offer a choice of 1, 4, 8, or 16 zone detection point capability from a single field-programmable self-contained metal enclosure. These Refrigerant monitors utilize NDIR (Non-dispersive infrared) and pyro-electric (absorptive sensing) technolog. Each zone (detection location) is capable of monitoring and responding to any one of 22 refrigerants from a standard library via keypad entry. Sentech Ancillary Refrigerant Monitors are also expandable, offering users the flexibility to change configurations or applications at a later date.


  • IR-SNIF-MCD1 (1 Zone), 3 Alarm levels · Remote PPM indicator w/audible silent switch.
  • IR-SNIF-MCD4 (4 Zone), 3 Alarm levels · Remote transmitters: Carbon Monoxide, Oxygen, etc.
  • IR-SNIF-MCD8 (8 Zone), 3 Alarm levels · Strobe light, Horn, Combination strobe/horn.
  • IR-SNIF-MCD-16 (16 Zone), 3 Alarm levels · Air-sampling pickup tubing.
  • IR-SNIF-MCD Custom Configurations · Calibrated test gas kit.

Sentech Ancillary Refrigerant Monitors Description;

  • One, Four, Eight, and Sixteen Zone Infrared Monitors.
  • Three alarm levels w/ Sampling points up to 250 ft (500 ft coverage).
  • Three relays, each w/ four (4) Form C Contact Outputs rated at 5 amps (for alarms and fan relay activation).
  • Standard 0 to 10 volt analog output (An optional 4-20 ma output is available).
  • Steel NEMA 1 Type Enclosure (NEMA 4 optional).
  • Four line LCD digital display with keyboard for setup and operator interface.
  • Setup function is password protected.
  • Monitor is key-lock protected to prevent unauthorized access to electronics.
  • Listed by ETL and conforms to UL STD 3101-1 and CAN/CSA No. 1010.1 specifications.
  • Meets the requirements of ASHRAE Standard 15.
  • Monitor is factory Calibrated—Automatic Electronic Re-Zeroing occurs after every air sample has been tested—No gas calibration with this model (Kit is required).
  • Delivery Time 2-4 weeks (16 zone—8 weeks).

Sentech Ancillary Refrigerant Monitors

Model IR-SNIF-MCD Options & Accessories;

  • 4-20ma Analog Output (Option for controls system).
  • Individual Zone Alarm Output (1-8 per board).
  • Custom NEMA 4 Enclosure (optional).
  • Serial data output (Specify RS 485 or RS232).
  • Remote transmitters, Carbon Monoxide, Oxygen, etc.
  • Strobe light, horn, strobe/horn combination.
  • Zone pickup tubing.

The 4-20 Ma Analog Output option can be utilized to interface the monitor to control devices such as the building maintenance computer system. It gives readings to the system in PPM levels, 4 milliamps output level is equal to 0 PPM and 20 milliamps level being equal to 1000 PPM level. This unit can be used to document any change in atmospheric content of refrigerant gas over extended periods of time through the building maintenance computer. It also gives readings of area gas content prior to entering the contaminated area in case of leak.

The Individual Zone Outpt  option is utilized as a control device reporting through relay contacts, both normally open and normally closed, the area which has entered the main alarm state. It can be used as an interface to the building maintenance computer to report which area is in alarm. It can also be used as a control circuit for exhaust fan operation, paging devise initialization; audio or visual alarm operation along with a multiple of other interface operations. It is utilized on multiple zone units only.

Sentech Ancillary Refrigerant Monitors

Model IR-SNIF-MCD Features;

  • Allows Compliance with ASHRAE Standard 15.
  • Detects all halogen based refrigerants.
  • Refrigerant type can be field changed without recalibration.
  • Continuous digital display of system status.
  • Analog output for remote monitoring.
  • System malfunction detection and indication.
  • Visual alarm indication.
  • Models are available to accommodate sampling points located up to 250 feet (76 meters) from unit.
  • Fresh air inlet for automatic re-zeroing.
  • Individually adjusted alarm points for each gas type being monitored.
  • Multi-zone capability at a modest premium over single zone units.

Sentech ancillary refrigerant monitors are advanced early warning loss detection and monitoring systems designed specifically for refrigerants. Sentech IR-SN IF-MCD Refrigerant Monitors are programmed by the users. Theyare cost effective, self-contained monitors of refrigerant gases that activate an alarm at a preset concentration. The Series includes single, four and eight zone models (16 zones special order). SenTech’s unique built in leak wait period also minimizes nuisance false alarms.

SenTech Ancillary refrigerant monitors IR-SNIF-MCD provide compliance with ASHRAE Standard 15. These systems are based on an advanced infrared technology that can detect multiple refrigerant types at concentration levels as low as one part per million (PPM).

Tech Data

Sentech Ancillary Refrigerant Monitors IR-SNIF-MCD Specifications:

  • Sensitivity – As low as 1 PPM.
  • Weight – 32 lbs, (14.4 Kgs).
  • Power Requirements – 120/240 Volt 50/60 Hz.
  • Range – 0 to 1000 PPM.
  • Alarm Trip Points; Low Alarm 0 to 100% of Full Scale. Main Alarm 0 to 100% of Full Scale. High Alarm 0 to 100% of Full Scale.
  • Operating Environmental Range. 32o – 125o Fahrenheit. 0o – 50o Celsius.
  • Alarm Outputs – Indicator Light; 3 Alarm Relays, 1 Horn Control Relay, each with 4 Form C contacts. (5 amps maximum).

Additional information

Number of Zones

1 Zone, 3 Alarm Levels, 4 Zone, 3 Alarm Levels, 8 Zone, 3 Alarm Levels, 16 Zone, 3 Alarm Levels


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