EXHEAT AFT40 Hazardous Area Thermostats | Flameproof Air & Process Sensing Thermostat Zone 1 Zone 2
EXHEAT AFT40
hazardous area thermostats
The EXHEAT AFT40 hazardous area thermostat is a heavy-duty hazardous area thermostat designed to control electric heating systems in Zone 1 and Zone 2 environments where explosive gas or vapour may be present.
Fully certified to ATEX and IECEx standards, this thermostat offers safe and precise temperature control in critical industrial applications. The AFT40 provides a simple and effective method of local temperature regulation for EX-rated heaters used in oil & gas, petrochemical, and chemical processing industries.
The EXHEAT AFT40 thermostat is supplied in a weatherproof or explosion proof enclosure to compliment the range of hazardous area air warmers and have an externally adjustable option enabling quick and accurate variable control for air heating applications.
Hazardous area thermostat has a lightweight cast aluminium enclosure certified weatherproof to IP6X and suitable for ambient temperatures from -60°C to +60°C.
EXHEAT AFT40 Hazardous Area Thermostats
AFT40 Hazardous Area Thermostats Key Features
- ATEX & IECEx Certified – Suitable for Zone 1 and Zone 2 hazardous areas
- Robust Stainless Steel Construction – Corrosion-resistant and durable
- Integrated Thermostat Control – Ensures temperature accuracy and safety
- Optional Wall-Mounting Brackets – Easy installation in fixed locations
- IP66 Protection – Dust-tight and protected against powerful water jets
- Control ranges: 0–25 °C, 0–40 °C, 0–60 °C
- Weatherproof: IP6X/IP66, suitable for extreme ambient range
| Specification | Details |
|---|---|
| Model | EXHEAT AFT40 |
| Function | Hazardous area temperature control |
| Temperature Range | Various options up to 200°C (model dependent) |
| Certification | ATEX, IECEx |
| Zones | Zone 1 & Zone 2 |
| IP Rating | IP66 |
| Material | Stainless Steel / GRP |
EXHEAT AFT40 Hazardous Area Thermostats
ATEX Certification & Installation
Certification: ATEX / IECEx 
II 2 G/D
Ex d IIC T6 Gb (Gas)
Ex t IIIC T85°C Db (Dust) IP6X
CU TR (EAC)
ATEX / IECEx II 2 G/D
Ex d IIC T6 Gb (Gas)
Ex t IIIC T85°C Db (Dust) IP6X
CU TR (EAC)
This sample Wiring Drawing is for the EXHEAT AFT model of thermostat – for all other heater wiring drawings refer to the O&M download opposite.
Please download EXHEAT AFT hazardous area thermostats O&M manual for full details on installation and maintenance procedures – this includes wiring diagrams, earth connection and pre installation inspection and checks.
| Specification | Details |
|---|---|
| Enclosure | Cast aluminium alloy with a maximum of two cable entries and external and internal earths – lightweight and certified weatherproof to IP6X |
| Controls | Choice of control range to suit process application |
| Mounting | Any threaded boss or flange in any material can be specified within the limits of the design parameters. Wall mounted |
| Voltage | 20A on 250VAC in a choice of switching configurations |
Applications
Ideal for controlling temperature in hazardous environments such as:
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EX‑rated electric heaters in oil & gas, petrochemical, chemical & offshore industries
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Air sensing for frost prevention in instrumentation cabinets
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Process control in Zone 1/2 gas atmospheres
Contact Us for Expert Support
As an authorised EXHEAT distributor, Thorne & Derrick can offer:
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Technical support and product selection
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Full datasheets, hazard certification documentation
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Pricing, lead times, and compliance guidance
Related Products
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EXHEAT HFT Thermostat (flameproof air-sensing, stainless steel, IP66)
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EXHEAT RFT Thermostat – process-sensing in flanged boss for liquid applications
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EXHEAT FXT Thermostat – compact, enclosure-mounted air thermostat
Air Heaters | Immersion Heaters | Line Heaters | Thermostats | ATEX & IECEX Certified Electrical Heaters
T&D – Experts in Equipment for Explosive Atmospheres
Trust Thorne & Derrick to specify and supply from stock safe and reliable Heat, Light & Power Products for use in hazardous area locations and explosive atmospheres certified to international standards including ATEX and IECEx – this includes Zone 1 / Zone 2 (Flammable Gas) or Zone 21 / Zone 22 (Dusts) and Class I, Division 1 and Division 2 hazardous area requirements.
Since 1985 as Leaders in ATEX Innovation we can facilitate succession planning for the replacement of obsolete, non-conformant and legacy equipment – we are the provider of innovative solutions to ensure ATEX and IECEx Compliance for Electrical, HVAC & Process Instrumentation systems in the explosive atmosphere industries.
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EXHEAT AFT Hazardous Area Thermostats – Data Sheet
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