One & Two zone optical detection of water leaks with audible warning, visual indication, Mute alarm push button and alarm relay for onward signalling. Both floor standing or wall mounted sensor are available. Used for drip trays bunded areas or dirty areas where detection cable would get damaged.

This unit has been designed to detect water using optical spot sensors in areas such as sump tanks, bunded areas, trip trays etc. where dirt or dampness can accumulate.

The mode of operation is the principle of total internal reflection. An LED and photo-transistor are housed in a plastic (Polysulfone) dome. When no water is present, light from the LED is internally reflected from the dome to the photo-transistor. When water comes into contact with the dome, the effective refractive index at the dome-water boundary changes allowing some light from the LED to escape. Thus the amount of light received by the photo-transistor is reduced indicating the presents of water.



  • Alphanumeric display for ease of Alarm identification from a distance
  • On board audible warning device to alert local operators of a problem
  • Alarms latched until Mute operated to give indication of transient water leaks
  • Common alarm relay to onward signal to a BMS or used to shutdown water valves
  • Optional output to remote sounder beacon
  • Optional output to SMS text messaging system

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Beacon for remote indication of an alarm
This 12VDC Flashing beacon can be used to advise of an alarm were noise is an issue such as hospital corridors or noisy environments.


SMS Text Messaging alert unit
For unmanned areas or to advise maintenance staff of a problem. With the addition of our SMS Text Messaging alert unit, an alarm will also be sent in text form to one or two phones. This unit is usually added where the alarm unit is mounted remote from maintenance staff, or in unmanned areas.

SMS Text Messaging alert unit

Water Valve
Water Valves to turn off the water supply when a water leak is detected 230VAC power open, slam shut water valves can be provided from ¼” to 2” BSP sizes. Pipe couplers are also available on request.

Water Valve

AS2 Remote Repeat Alarm
This unit can be fitted to remote areas such as reception areas maintenance rooms or corridors were visual and audible warnings are required.

AS2 Remote Repeat Alarm

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