Haloguard III

Photoacoustic Infrared, Highly Selective, Most Sensitive (1ppm), 24-hour Refrigerant Leak Detection and Notification Refrigerant Leak Detection and Monitoring Systems

Haloguard III Photoacoustic Infrared, Multichannel, Multigas Detection and Notification Refrigerantthermalgas haloguard III full removebg preview Leak Detection and Monitoring Systems

The HALOGUARD ® III combines advanced microprocessor based digital signal processing and a wideband photoacoustic infrared cell to provide the newest, most advanced system for continuous monitoring of all refrigerant gases.

The HALOGUARD ® III monitors single or multiple, local and remote locations and provides notification when gas concentration reaches preset alarm levels. Up to 24 different gases may be monitored simultaneously by adding optional channel scanners and remote IR modules.

Alarm relays and analog outputs are designed to activate remote devices or to interface with an energy management (EMS)or building automation (BAS)system.


  • Simple installation
  • Easy field calibration
  • Up to 500 ft. sample draw
  • Three user alarms adjustable between 50 ppm &100% of scale
  • LCD shows PPM Concentration, Alarm, Test, Reset and Fault Diagnostics
  • Three flashing alarm LEDs
  • Fault, Ready & Power ON/OFF LEDs
  • Analog output for BAS/EMS interface or data logging
  • Four alarm relays for ventilation, damper or remote notification
  • Alarm Test & Reset / Silence push buttons
  • High-intensity audible alarm
  • Rugged enclosure

Options & Accessories

  • 2,4 or 8 channel scanner
  • Remote IR module
  • Amber strobe light alarm
  • Remote strobe light & horn alarms
  • Gas calibration kit
  • NEMA 4/12 enclosure
  • Oxygen depletion sensor


Technology Photoacoustic Infrared
Electrical Supply 115-230v, 50-60 Hz, 65W
Fuse 3A/240V, fast acting
Output Signal Std: 4x5A, dry contact relay SPDT
Opt: 7x5A, dry contact relay SPDT
Opt: 0-5VDC, 4-20mA analog
Sensitivity 20 ppm
Resolution 1 ppm
Measuring Range 0-1000 ppm all refrigerants
Response Time <1 minute per channel
Clearing Time <3 minutes per channel
Maximum Sample Point
Tubing Length
150′ with standard performance
500′ optional where slower
response is acceptable
Operating Conditions 30°F to +120°F non-condensing
Enclosure: Std: NEMA 250, 20 lbs.
Opt: NEMA 4/12, 25 lbs.
Sample Rate 1.0 lpm
Listed to UL 3111-1 and CAN/CSA-C22.2 No. 1010.1-92

Warranty (click for details)

Sensor element is unconditionally guaranteed for one year from the date of shipment. Any sensors found defective in that period will be replaced free of charge.

Documents Available for Download (click for complete listing)

Thermal Gas Systems, Inc.

11285 Elkins Rd.
Bldg. H-1
Roswell GA 30076
Tel: 770 667-3865
Fax: 770 667-3857
Toll Free: 800 896-2996
Email: info@thermalgas.com

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