ATEX Fire Detectors | Zone 1 & Zone 2 Heat & Fire Detector | Ex d, Ex em, Ex ia – Eaton HD1

ATEX Detectors, Control & Distribution Units Zone 1 & Zone 2 Heat Detector Ex d, Ex em, Ex ia – Eaton HD1 Hazardous Area Control & Distribution Units

ATEX Detectors, Control & Distribution Units Zone 1 & Zone 2 Heat Detector Ex d, Ex em, Ex ia – Eaton HD1

ATEX Fire & Heat Detectors

Zone 1 & Zone 2

Eaton MEDC HD1 are ATEX heat detectors that have been designed for use in ATEX & IECEx Zone 1 and Zone 2 hazardous areas. These hazardous are heat detectors 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 (Ex d version) or JB10 corrosion-free GRP enclosure (Ex ia, Ex em/UL versions). The contact in the ATEX heat detector closes at alarm temperature.

Eaton MEDC HD1

Eaton MEDC HD1

ATEX Detectors, Control & Distribution Units

Zone 1 & Zone 2

ATEX Detectors, Control & Distribution Units



  • Zone 0, Zone 1 and Zone 2 use.
  • UL listed for USA and Canada
    • Class I, Div 2, Groups A-D.
  • Ex ia IIC T4/T6, Ex d IIB T3/T6 or Ex em II T6.
  • ATEX approved:
    • – Ex II 1G (Exia)
    • – Ex II 2G (Exd/Exem).
  • IECEx Certified Ga
  • BASEEFA certified.
  • TR CU certified.
  • SIL 2 certified.
  • Chinese (CQST) certified.
  • IP66 & IP67.
  • Certified temperature:
    • –20°C to +125°C (Ex d)*.
    • –20°C to +55°C (Ex em/UL).
    • –55°C to +55°C (Ex ia).
  • Stainless steel probe.
  • Detector temperature settings:
    • 60°C to 385°C
    • 140°F to 725°F
  • Marine grade alloy or GRP enclosure*.
  • Optional guard.

*Model dependent.

Eaton MEDC HD1 - Dimensions

Eaton MEDC HD1 – Dimensions

Eaton MEDC HD1

Listed Temperature Settings:

To select appropriate temperature settings, choose detector at 100ºF (38ºC) above maximum ambient temperature.

Temperature Setting Tolerance Colour Code Text on Probe
(ºF) (ºC) (ºF) (ºC)
140 60 +7/-8 ±4 Black
160 71 +7/-8 ±4 Black
190 88 +7/-8 ±4 White
210 99 +7/-8 ±4 White
225 107 +7/-8 ±4 White
275 135 ±10 ±6 Blue
325 163 ±10 ±6 Red
360 182 ±10 ±6 Red
450 232 ±15 ±8 Green
500 260 ±15 ±8 Orange
600 316 ±20 ±11 Orange
725 385 ±25 ±14 Orange

MEDC HD1 Hazardous Area Heat Detector

Technical Specification

Hazardous Area Specification
ATEX EEx d IIB Cert. no. Baseefa03ATEX0447.
Certified to: EN50014, EN50018, EN50281-1-1.
Ex II 2 GD, EEx d IIB T6 (T3 @ 125ºC).
ATEX Ex d IIC Cert. no. Baseefa08ATEX0320.
Certified to: EN60079-0, EN60079-1, EN61241-0, EN61241-1.
Ex II 2 GD, Ex d IIC T6, Ex tD A21 T85ºC (-20ºC to + 55ºC).
ATEX EEx em Cert. no. Baseefa03ATEX0428.
Certified to: EN50014, EN50019, EN50028.
Ex II 2G, EEx em II T6 (-20ºC to + 55ºC)
ATEX Ex ia Cert. no. Baseefa03ATEX0427.
Certified to: EN60079-0, EN60079-11.
Ex II 1G, Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors).
IECEx Ex ia Ex II 1G, Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors).
IECEx Ex ia: Cert. no. BAS 13.0010.
Certified to: IEC60079-0, IEC60079-11
Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors)
UL Listing no. E252920 – versions up to 450ºF.
Listing no. E254077 – versions from 600ºF to 725ºF.
UL for USA and Canada, listed to Class 1, Div 2. Groups A – D
CUTR 1Ex d IIB T3/T6.
2Ex de IIC T4/T6.
0Ex ia IIC T4/T6
Russian Fire Approved.
CQST Certified Ex ia.
Inmetro Certified EEx d, EEx ia & EEx em
ABS American Bureau of Shipping type approval for HD1BBD & HD1B1 only
SIL SIL2 certified. Cert no. Sira FSP 12007/02
Technical Specification
Material Detector: stainless steel.
Enclosures: Exd – LM25 marine grade alloy.
Exia/Exem/UL – GRP (anti-static).
Stainless steel cover screws.
Optional Guard: 316 stainless steel.
Finish Detector: Sand blasted.
Enclosures: Exia/Exem/UL – Natural black or painted to customer’s
Exd painted to customers specification
Certified Temp -20ºC to 55ºC (T6) Exem, UL, Exd IIC, CQST Exd IIB.
-20ºC to 55ºC (T6) -20ºC to 125ºC (T3) Exd IIB (Not CQST).
-55ºC to 55ºC (T6) Exia.
Weight Exd, 2kg.
Exia/Exem/UL, 1.1kg
Ingress Protection IP66 & IP67
Operation The detector contact is normally open and CLOSES at alarm
Contact Rating Ex d, EEx em, UL: 125V a.c.-5A, 125V d.c.-0.5A, 48V d.c.-1A, 24V d.c.-2A.
Ex ia: 30V – 300mA
Entries 2 x M20 ISO (ATEX/Exd/Exe/Exi versions).
2 x ½” NPT via adaptors (UL version)
Terminals 6 x 4sqmm (BK6).
Resistor Series & EOL resistor (maximum total 2) minimum value (each) 470Ω
Diodes Up to 2 off available in Exd IIB and Exia versions
Labels Optional stainless steel tag and duty labels


The following code is designed to help in selection of the correct Eaton hazardous area heat detector with ATEX & IECEx approval and certification. Build up the part number by inserting the code for each component into the appropriate box.

Eaton MEDC HD1 - Ordering Requirements

Eaton MEDC HD1 – Ordering Requirements

ATEX Heat Detectors

ATEX Heat Detectors

High Voltage Electrical Equipment

To support the safe and reliable distribution of Medium & High Voltage Electricity in industrial non-hazardous and hazardous area locations, Thorne & Derrick distribute a complete range of MV HV Electrical Connectors, Joints & Terminations including ATEX Certified variants for installation in Zone 1 & Zone 2 explosive atmospheres.

Data Sheets