HFT Flameproof Air Sensing Thermostats

Product Applications
  • Accumulator System Cabinet
  • Acoustic Enclosure
  • Air Heating for Instrumentation
  • Anti Condensation Heater
  • Anti-Freeze
  • Battery Cabinet Heater
  • Cabinet
  • Chemical Injection Cabinet
  • Compressor Enclosure
  • Compressor Frame Enclosure
  • Condensation Prevention
  • Control / Monitoring Panels
  • Control Housing
  • Diesel Generator Enclosure
  • Electrical Panel
  • Enclosure
  • Fire Equipment Cabinet
  • Frost Protection
  • Gas Seal Panel
  • GRP Enclosure
  • Hazardous Area Process Temperature Measurement
  • Heating Cabinet
  • Instrumentation Cabinet
  • Instrumentation for Compressor Package
  • Junction Boxes
  • Machine Enclosure
  • Motor Cases/Enclosures
  • Motor Enclosure
  • Offshore Cabinet
  • Offshore Panel Heater
  • Outdoor Telecommunications Cabinet
  • Panel for Compressors
  • Panel Heaters
  • Power Distribution Panels
  • Process Temperature Measurement
  • Pump Enclosure Safety Stat
  • Silo Base Enclosure warming
  • Skid Enclosure
  • Switchgear Panel/Cubicles
  • Temperature Measurement
  • Thermowell Assemblies
  • Thermowells
  • Transformer Enclosures
  • Transmitter Enclosures
  • Wardrobe

EXHEAT Industrial’s HFT thermostats are supplied in weatherproof or explosionproof enclosures to complement our heaters. All thermostats are certified for use in hazardous areas where the atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group. The HFT is designed for the temperature control of work or storage areas, in conjunction with a hazardous area air heater.


  • Certified to ATEX, IECEx, CSA or CU TR (EAC) standards
  • Ingress protection IP66 / Type NEMA 4X
  • Wall mounted
  • 316 stainless steel enclosure
  • Suitable for ambient temperatures from -60°C to +60°C


Certification ATEX / IECEx    II 2G Ex db IIC T6 Gb
CSA (CEC / NEC) Class I, Division 2, Groups A, B, C, D; T6, Type 4X (USA / CAN)
CSA (CEC) Ex db IIC; T6 Gb; IP66 (CAN)
CSA (NEC) Class I, Zone 1, AEx db IIC; T6 Gb; IP66 (USA)
Enclosure Cast 316 stainless steel with 2 × M20 cable entries, external and internal earths and internal neutral link
Controls Choice of control range: 0 to 25°C, 0 to 40°C or 0 to 60°C options
Mounting 2 × 6mm dia shrouded mounting holes are provided
Voltage SPDT, 20A on 250VAC in a choice of switching configuration