Apollo Orbis I.S. A1S Heat Detector (ORB-HT-51157-APO)

The Apollo Orbis I.S. A1S Heat Detector (ORB-HT-51157-APO) provides reliable heat detection for hazardous environments where smoke detectors may not be suitable. The A1S monitors temperature using a single thermistor network, which generates a voltage output to match to the surrounding air temperature, making for accurate heat detection.

Designed for use in intrinsically safe fire alarm systems, the ORB-HT-51157-APO performs well in environments where dust, smoke, steam, or airborne contaminants are part of normal day-to-day operations. By noticing heat rather than smoke particles, the A1S helps reduce false alarms while keeping reliable fire detection.

The detector is also available with an optional flashing LED version for applications that require enhanced visual indication. Advanced Orbis technology helps improve reliability while reducing false alarm incidents in challenging environments.

Key Features

• Intrinsically safe A1S heat detector
• Single thermistor heat sensing technology
• Suitable where smoke detectors are unsuitable
• Ideal for dusty or smoky environments
• Reduced false alarm incidence
• Increased detection reliability
• Optional flashing LED version available
• Designed for hazardous areas
• Reliable operation in harsh environments
• Compatible with Apollo Orbis intrinsically safe systems

Typical Applications

The Apollo ORB-HT-51157-APO is suitable for:

• Dusty environments
• Hazardous areas
• Offshore platforms
• Refineries
• Small to medium-sized buildings
• Process plants
• Industrial facilities
• Areas where smoke detection may cause unwanted alarms