The C-Tec BF316WPH unit was a System Sensor 2251EM analogue addressable optical smoke detector designed for use on System Sensor protocol fire alarm systems. This device is now obsolete, however a replacement product is available from The Safety Centre. The System Sensor 22051E-26 Analogue Addressable Optical Smoke Detector can be used as a replacement.
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C-Tec BF316WPH Smoke Detector Replacement Unit
The System Sensor 22051E-26 device features the same direct decade rotary dial switches on the reverse of the detector. These rotary dials are used to set the unique device address on the sensor.