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MEDC HD1 Heat Detector Range

Eaton's Crouse-Hinds series MEDC HD1 heat detector range is 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.  

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

Highly Certified
SIL2 certified
Choose from a wide range of temperatures to suit your application
Material Options
Marine grade alloy or GRP enclosure

Certifications and compliances


  • Cert. no.  Baseefa03ATEX0447
  • Certified to: EN50014, EN50018, EN50281-1-1
  • Ex II 2 GD, EEx d IIB T6 (T3 @ 125°C)


  • Cert. no. Baseefa08ATEX0320
  • Certified to: EN60079-0, EN60079-1, EN61241-0, EN61241-1
  • Ex II 2 GD, Ex d IIC T6, Ex tD A21 T85°C (-20°C to + 55°C)


  • Cert. no. Baseefa03ATEX0428
  • Certified to: EN50014, EN50019, EN50028
  • Ex II 2G, EEx em II T6 (-20°C to + 55°C)

ATEX Ex ia

  • Cert. no. Baseefa03ATEX0427
  • Certified to: EN60079-0, EN60079-11
  • Ex II 1G, Ex ia IIC T6 Ga (-55°C to + 55°C). (T4 with diodes/resistors)

IECEx Ex ia

  • Cert. no. IECEx BAS 13.0010
  • Certified to: IEC60079-0, IEC60079-11
  • Ex ia IIC T6 Ga (-55°C to + 55°C). (T4 with diodes/resistors)


  • Listing no. E252920 – versions up to 450°F
  • Listing no. E254077 – versions from 600°F to 725°F
  • UL for USA and Canada, listed to Class 1, Div 2. Groups A, B, C, D


  • 1Ex d IIB T3/T6
  • 1Ex d IIC T4 / T6
  • 2Ex de IIC T4/T6
  • 0Ex ia IIC T4/T6
  • Russian Fire Approved


  • Certified Ex ia


  • American Bureau of Shipping type approval for HD1BBD & HD1BI only


  • SIL2 certified. Cert no. Sira FSP 12007/02

Design features

  • IP66 & IP67
  • Certified temperature:

                 –4°F to +257°F, –20°C to +125°C (Exd)*

                 –4°F to +131°F, –20°C to +55°C (Exem/UL)

                 –67°F to +131°F, –55°C to +55°C (Exia)

  • Stainless steel probe
  • Detector temperature settings:

                    60°C to 385°C, (140°F to 725°F)

  • Marine grade alloy or GRP enclosure
  • Optional stainless steel guard

 *Model dependent

Standard materials

  • Detector: Stainless steel
  • Enclosures: Ex d – LM25 marine grade alloy, Ex ia/Ex em/UL – GRP (anti-static)
  • Cover screws: Stainless steel
  • Optional guard: 316 stainless stee
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Questions before you buy

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