Hazardous Area Detection

Orbis Intrinsically Safe Class BS 77°C Heat Detector

Product Overview

The Orbis Intrinsically Safe Heat Detector (ORB-HT-51151) is a thermistor-type conventional heat detector for use in hazardous areas.

The heat detector has a static (fixed) alarm threshold of 77°C, and complies with British Standard BS EN 54-5 (AS ISO 7240.5) for Point-Type Heat Detectors.

The ORB-HT-51151 may be interfaced with Pertronic conventional fire alarm control panels and the Pertronic Multi-Function Loop Responder via the Pertronic Galvanic Isolator Interface (ISGAIFNZSSAP). Please refer to the datasheet for details.


  • Intrinsically-safe thermistor heat detector
  • 77°C static (fixed) threshold (BS EN 54-5 Class BS)
  • Complies with British Standard BS EN 54-5 (AS ISO 7240.5) for Point-Type Heat Detectors
  • Standards & Approvals: EN 54-5, ABS, ATEX, BASEEFA, BOSEC, BV, CCS, CPD, DNV-GL, FG, IECEx, LPCB, LR, KRS, MED, and VdS


WARNING: The information on this website must not be used as partial or full instructions for the design, construction, installation, commissioning, or maintenance of systems in hazardous areas. Cabling and fire system devices in hazardous areas must be designed and installed by properly qualified persons, in accordance with all applicable standards and regulations.