System Sensor Addressable Multi-Sensor Detector


Key Features

  • Two-sensor multi-criteria fire detector
  • Improved false alarm immunity
  • 100% mechanical and electrical backwards compatibility
  • Rotary decade address switches
  • EN54 (2000) Part 5-7


System Sensor Addressable Multi-Sensor Detectors provide a consolidated, reliable and high-quality detector platform with digital communication that is suitable for medium to large applications.

System Sensor Addressable Multi-Sensor Detectors combine thermal and photoelectric detection technology to provide advanced false alarm immunity and faster response to a wide range of fires. The two separate sensing elements are managed by embedded software which enables them to act as a single unit. 

In areas where the normal daytime activities may potentially create unwanted alarms, these detectors can also be programmed to operate in “heat only” mode. System Sensor Addressable Multi-Sensor Detectors will automatically revert to full photo-thermal operation during unoccupied periods.

These detectors are housed in a modern, white enclosure and have a tri-colour LED offering red, green and amber colours providing 360° visibility.



Tech Specs

Operating Voltage Range 15 to 32Vdc
Maximum Standby Current 200μA at 24VDC (no communications) / 300μA at 24VDC ( LED blink enabled, once every 5s)
LED Current Red: 3.5mA @ 24Vdc,Green: 7.0mA @ 24Vdc, Yellow: 10.5mA @ 24Vdc
Remote Output Voltage  22.5Vdc @ 24Vdc
Remote Output Current 10.8mA @ 24Vdc
Additional Loop Resistance Using The B501AP Typically 20mohm (max 30 mohm)
Isolator Operating Voltage Range  15 to 28.5Vdc
Isolation Current15mA at 24Vdc
Maximum Continuous Current  1A (Switch Closed)
Temperature Range -30°C to +80°C
Humidity10 to 93% relative humidity (non-condensing)
Height61mm installed in B501AP base
Diameter102mm installed in B501AP base
Weight 99g (inc base)
Max Wire Gauge for Terminals 2.5mm2

Do not install detectors in locations where normal ambient temperature exceeds 50°C



Eurofyre is an authorised distributor of Honeywell and we support the entire Morley IAS and System Sensor range of products. We offer expert advice and supply all aspects of fire detection systems including excellent before and after-sale support.

Contact us to receive competitive trade discounts or apply online for a credit account.