MEDC SM87 Hazardous Area Beacon, ATEX Zone 1 & 2 Ex d

Overview

The MEDC SM87 heat detector combines a Fenwal rate-compensated heat detection element with an explosion-proof Ex d enclosure, providing a dependable fire detection device for hazardous areas. The detector is mounted to a type SM87 marine grade alloy enclosure, giving an all-stainless steel external construction suitable for offshore and onshore installations.

The unit is part of the Eaton Crouse-Hinds series MEDC HD1 heat detector range, designed for fire alarm and suppression systems in paint spray booths, flammable material stores, turbine rooms, extract ductwork, and other hazardous areas throughout the oil and gas, petrochemical, and process industries.

Engineering & Design

The Fenwal rate-compensated detector responds to the rate of temperature rise as well as absolute temperature, providing early detection of fast-developing heat sources while remaining stable in normal ambient conditions. The contact in the detector closes at the alarm temperature, providing a discrete alarm signal to the fire detection system.

The SM87 marine grade alloy enclosure is certified for explosive atmospheres with Ex d protection and is rated IP66/67, protecting the detector element from water and dust ingress in demanding outdoor and offshore environments. The 24 VDC operation and M20 cable connection allow direct integration with standard fire alarm systems.

Key Features

• Explosion-proof heat detector for hazardous areas
• Fenwal rate-compensated detection element
• Contact closes at alarm temperature
• SM87 marine grade alloy enclosure (Ex d)
• 316 stainless steel body construction
• IP66/67 ingress protection
• 24 VDC operation, M20 connection
• Part of Eaton Crouse-Hinds MEDC HD1 range
• Oil and gas, marine, and process applications

Applications

• Offshore platform fire detection
• Paint spray booths and flammable material stores
• Turbine rooms and extract ductwork
• Oil and gas, petrochemical, and process plants
• Fire alarm and suppression system initiation

Specifications

Fire detection in hazardous areas demands certified hardware, and the MEDC SM87 Ex d heat detector provides it, which is why Seven Star LLC supplies the MEDC SM87 heat detector for offshore and onshore fire protection projects.

The MEDC SM87 heat detector is the rate-of-rise and the fixed temperature detector of the hazardous area range with the Category 1 approval for the gas group. The detector is mounted on the junction box of the fire loop and gives the heat alarm to the fire panel. The detector head is interchangeable with the other SM87 sensor heads of the same base, which simplifies the maintenance of the installed loop.

The SM87 heat detector is connected on the same two-wire loop as the smoke detectors of the zone, and the base provides the continuity of the line when the head is removed. The fixed temperature element is rated for the ambient conditions of the storage area and the rate-of-rise element responds to the fast temperature change. The detector covers the ceiling area according to the spacing rules of the hazardous area installation.

Why Seven Star LLC

Seven Star LLC supplies the MEDC SM87 Ex d heat detector for hazardous area fire detection projects across the Gulf, with verified certification documentation and technical support. Our team assists with detector selection for Zone 1 and Zone 2 installations and fire system compatibility.

We support offshore, oil and gas, and process customers with genuine MEDC and Eaton Crouse-Hinds products throughout the GCC.

Hazardous Area Performance

The Ex d marine grade alloy enclosure contains the heat detection element so that the detector can operate in explosive atmospheres without becoming an ignition source, while the 316 stainless steel body resists corrosion in offshore and chemical plant environments. The IP66/67 rating keeps water and dust out of the sensing chamber.

The rate-compensated response of the Fenwal element balances early detection against false alarm stability, and the normally open contact closes at the alarm temperature, providing a simple, reliable interface to fire alarm systems.

Confirming the SM87 Detector Specification

Hazardous area fire detectors must match both the fire system design and the area certification. When ordering a replacement or additional unit, confirm these points from the nameplate and the project documents:

• The complete type code and certification marking on the enclosure label, including the gas group and temperature class for your zone.
• The alarm temperature of the rate-compensated element, which should be chosen to suit the normal maximum ambient temperature of the protected area.
• The supply voltage, cable entry size and gland type used on site.
• The wiring arrangement on the detection loop, including any end-of-line or alarm resistors needed by the fire panel.

Installation Guidelines

Install the detector where heat from a fire will reach it quickly, typically at high level above the risk, following the spacing rules of the applicable fire detection standard and the project layout. In outdoor Gulf locations, consider solar gain on the enclosure when choosing the alarm temperature, so that normal daytime heating does not bring the detector close to its set point. Use certified cable glands suitable for the Ex d enclosure, keep the flameproof joints clean and undamaged, and close the cover to the specified torque. Unused entries must be closed with certified stopping plugs.

Testing and Maintenance

• Test each detector periodically with a suitable certified heat test method, and confirm the alarm is received at the fire panel.
• Inspect the enclosure, glands and flamepath for corrosion or damage during routine Ex inspections.
• Check loop wiring and terminations when a detector shows an open-circuit or fault condition.

Applications in Oman and the GCC

Offshore platforms, gas compressor stations, turbine enclosures and chemical storage areas across Oman and the GCC need fire detection that can handle hazardous atmospheres, salt-laden air and high temperatures. The MEDC SM87 heat detector, with its stainless steel construction and IP66/67 rating, is designed for exactly these conditions.

Supply from Seven Star LLC

Seven Star LLC supplies MEDC hazardous area signalling and detection products for projects and maintenance. Share the existing type code and certification details, and we will check that the replacement matches your installation.

Request a Quote for MEDC SM87 | Hazardous Area Beacon | ATEX Beacons Zone 1 & Zone 2 Steady Beacons LU1/LU3 Ex d

For the MEDC SM87 heat detector, Ex d hazardous area detector or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your measurement range, connection and configuration, and our specialists will respond with a detailed commercial proposal and the official MEDC documentation.

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