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Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors

IR-SNIF 1,2,3 (Single Zone w/ 3 Alarm levels)

Product Description

Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors

Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors are Infrared Monitors that are advanced multi-point refrigerant detection systems. They are designed for highly reliable performance with the flexibility to satisfy a wide range of continuous monitoring applications.

Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors offer a choice of 1, 4, 8, or 16 zone detection point capability from a single field-programmable self-contained metal enclosure. Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors utilize NDIR (Non-dispersive infrared) and pyro-electric (absorptive sensing) technology. Each zone (detection location) is capable of monitoring and responding to any one of 22 refrigerants from a standard library via keypad entry. Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors are also expandable, offering users the flexibility to change configurations or applications at a later date.


  • 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).  The 4 –20 milliamp Analog Output option can be utilized to interface the monitor to control devices such as the building maintenance computer system to give readings to the system in PPM levels. 4 milliamp output level is equal to 0 PPM and 20 milliamp level being equal to 1000 PPM level. This unit can be used to document through the building maintenance computer any change in atmospheric content of refrigerant gas over extended periods of time and to give readings of area gas content prior to entering the contaminated area in case of leak.
  • Individual Zone Alarm Output (1-8 per board).  The Individual Zone Output option is utilized as a control devise reporting through relay contacts both normally open and normally closed the area which has entered the main alarm state and 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.
  • Custom NEMA 4 Enclosure Serial data output (Specify RS 485 or RS232),  NEMA 4 Enclosure (Optional), Four (4) Channel Analog Input


  • Horn Alarm (only)
  • Strobe Alarm (only)
  • Combination Horn/Strobe Alarm Kit (Clear lens)
  • 250ft Reel of 1/4″ O D Tubing

Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors are ASHRAE Standard 15 compliant. Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors system is based on an advanced infrared technology that can detect multiple refrigerant types at concentration levels as low as ten part per million (PPM).


  • 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


  • Strobe light, horn, strobe/horn combination
  • Zone pickup tubing

Tech Data

Sentech IR-SNIF-1,2,3 Single Zone Refrigerant Monitors


Sensitivity As low as 10 PPM

Weight 16 lbs, (7.2 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 Alarm Relays with 4 Form C contacts (2 amps maximum)

Product Accessories


Product Manuals



Additional Information

Weight 18 lbs


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