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IR-SNIF Refrigerant Monitors

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The Environmental System IR-SNIF are advanced early warning loss detection and monitoring systems designed specifically for refrigerants.

SenTech's IR-SNIF models are cost effective, self-contained monitors of refrigerant gases that activate an alarm at a preset concentration that is programmed by the user. The Series includes single, four and eight zone models (16 zones special order) . SenTech's unique built in leak wait period minimizes nuisance false alarms.

SenTech IR-SNIF monitors provide compliance with ASHRAE Standard 15.

The IR-SNIF 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).

Call for additional information on the IR-SNIF series and other SenTech single and multi-zone monitors.


  • 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 rezeroing
  • Individually adjusted alarm points for each gas type being monitored
  • Multizone capability at a modest premium over single zone units


  • SNIF-1A 1 Zone, 3 Alarm levels
  • SNIF-4A 4 Zone, 3 Alarm levels
  • SNIF-8A 8 Zone, 3 Alarm levels
  • SNIF-16A 16 Zone, 3 Alarm levels


  • 4-20 ma analog output
  • Strobe light, horn, strobe/horn combination
  • Zone pickup tubing


As low as 1 PPM

25 lbs, (11 Kgs)

Power Requirements
120/240 Volt 50/60 Hz

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 fixed at 100% of Full Scale

Operating Environmental Range
32o - 125o Fahrenheit
0o - 50o Celsius

Alarm Outputs
Indicator Light
3 Alarm Relays with 4 Form C contacts each
(5 amps maximum)

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

Model IR-SNIF-1A (Base Unit)
Model IR-SNIF-4A (Base Unit)
Model IR-SNIF-8A (Base Unit)
Model IR-SNIF-16A (Base Unit)

  • 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 4-20ma 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)

  • 4-20ma Analog Output (Option for controls system)
  • Individual Zone Alarm Output (1-8 per board)
  • Custom NEMA 4 Enclosure

  • Horn Alarm (only)
  • Strobe Alarm (only)
  • Combination Horn/Strobe Alarm Kit (Clear lens)
  • 250ft Reel of 1/4" O D Tubing
  • Remote Audible Alarm Silent Switch
  • Remote PPM Indicator w/ Audible Alarm Silent Switch
  • External Transient Voltage Surge Suppression (single or split-phase)
  • Oxygen Deficiency Monitor, Meter, Audio/Visual Alarms (1-4 Zones)
  • Self-Contained Breathing Apparatus
  • Wall Mounting Cabinets for SCBA
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