MEDC HD1 Heat Detector


Heat Detector Exd, Exem & Intrinsically Safe (Exia)

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HD1 Range – Heat Detector

The MEDC heat detector has been designed for use in hazardous environments. These units are suitable for fire alarm and/or suppression systems in offshore and onshore applications including paint spray booths, flammable material stores, turbine rooms, extract ductwork and other hazardous areas throughout the oil & gas, petrochemical and process industries.

Comprising a Fenwal rate-compensated detector with all-stainless steel external construction, mounted to either a type SM87 marine grade alloy enclosure (Exd version) or JB10 corrosion-free GRP enclosure (Exia, Exem/UL versions). The contact in the detector CLOSES at alarm temperature.


  • Zone 0, Zone 1 and Zone 2 use.
  • ATEX certified.
    • EExd IIB T3/T6.
    • Exd IIC T6.
    • EExem II T4/T6.
    • Ex ia IIC T4/T6.
  • IECEx certified.
  • Ex ia IIC T4/T6 Ga.
  • UL listed for USA and Canada:
  • Class I, Div 2, Groups A-D.
  • CUTR certified.
  • Chinese (CQST) certified
  • Brazilian (Inmetro) certified.
  • SIL 2 certified.
  • IP66 & IP67.
  • Certified temperature:
    • –20ºC to +125ºC (Exd)*.
    • –20ºC to +55ºC (Exem/UL).
    • –55ºC to +55ºC (Exia).
  • Stainless steel probe.
  • Detector temperature settings: 60ºC to 385ºC, (140ºF to 725ºF).
  • Marine grade alloy or GRP enclosure.
  • Optional Stainless Steel guard.
    *Model dependent.
Technical Specification
CertificationATEX, IECEx, UL, TR CU, Russian Fire Approval,CQST, ABS, SIL 2
Explosion ProtectionEx II 2GD Ex d IIB T6
Ex II 2 GD Exd IIC ExtD A21 T85ᵒC
Ex II 2 G Ex em II T6 (T4 with diodes/resistors)
Ex II 1 G Ex ia IIC T6 (T4 with diodes/resistors)IECEx Ex ia IIC T4/6 Ga.
Area ClassificationZone 0, Zone 1 and Zone 2 use.
Certified Ambient Temperature-20°C to +125°C Exd (T3) ATEX/TR CU
-20°C to +55°C Exd (T6)/Ex em/UL
-55°C to +55°C Ex ia
Ingress ProtectionIP66 & IP67
MaterialEnclosures: Marine Grade Alloy (Ex d)
Corrosion-free GRP (Ex ia/Ex em/UL)
Detector: Stainless Steel
Cover Screws: Stainless Steel
Temperature Settings140°F to 725°F (60°C to 385°C)
Entries2 x M20 ISO
Weight1.1-2.0kg (model dependent)
OptionsEnclosures, guard, colour, tag and duty labels,
temperature setting. Series and EOL resistors,
blanking plugs.


MEDC HD1 Heat Detector Datasheet