W-BS-Base-Wall-SounderThe W/BS is a Loop Powered Wafer Fire Alarm Sounder which is fully Compatible with Hochiki’s ESP analogue addressable protocol.

The W/BS comprises of a low profile design sounder for the analogue sensor, allowing solid state addressing either automatically by the control panel or remotely by using the ASX Programmer. The unit can be installed quickly and efficiently producing significant savings in labour costs by not requiring any additional wiring. A selection of tones is available and the unit can be driven continuously or pulsed under full synchronisation of the control panel and hence all sounders will pulse at the same time.

The unit can also be mounted on the standard analogue addressable base and adapts to a Wall Mounted version by the simple addition of a clip on cover.



  • Single Loop Address
  • Wall addresses 1 – 127
  • Sensor Base addresses 128 – 256
  • Loop Powered
  • Variable sound output 50-98dB (A)
  • Connects onto Analogue Sensor Base
  • May be wall mounted with cover plate
ColourIvory / White
Ordering CodeW/BS sensor base model, W/BS/C wall mount model
Operating VoltageLoop 17-41 Vdc
Low Power Mode40μ A
Quiescent Current150μ A
Alarm Current0.8mA@50dB (A), 16mA @ 98dB (A)
Transmission MethodDigital Communications Using ESP
Weight / Dimensions112g / 113H, 113W, 43D
Operating Temp. Range-10°C to + 50°C
Storage Temp. Range-30°C to + 70°C
Maximum Humidity95%RH – Non Condensing (at 40°C)
Ingress Protection RatingIP21
ApprovalsLPCB & VdS