CMR - Model LD2 - One and Two Zone Water Leak Detection Alarm System
From Water Leak Detection
Designed to raise an alarm when water touches the leak detection cable or spot probes. One & Two zone water leak detection with audible warning, visual indication, Mute alarm push button, alarm and fault relays for onward signalling and optional battery backup. For a one and two zone water leak detection system that includes a water shut-off valve, please see our LDV2 One and Two Zone Water Leak Detection Alarm with Water Shut-off Valve.
Sized at 120mm x 120mm x 60mm deep, the one and two zone water detection alarm units have been designed to monitor critical areas for water leaks via spot sensors or linier cable. Any number of spot sensors or a maximum of 50 metres of linier water detection cable can be connected to each zone.
The range comes as standard with monitoring of the interconnecting cable between the sensors and the control unit. Any disconnection of the sensors from the controller will instigate a “Sensor Fault” alarm.
Complete with an audible warning device, mute push button, flashing 8mm red alarm lamp and 8mm Control live green lamp, the sensor monitoring circuit includes an 8mm tri-coloured LED, red (fault) /green (Normal) lamps per zone.
- Large indication LED lamps 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
- Lamps, relay and Horn test Facility to ensure that the unit is working correctly
- Zone signal isolation to stop multiple alarms due to sensors coming into contact with Earth
- Common alarm relay to onward signal to a BMS or used to shutdown water valves
- Monitoring of each zone cable and sensor to ensure continuity and integrity
- A Bi-directional DC signal in the sensors to stop electrolyses and polarisation
- Individual Zone sensitivity adjustment allowing any zone to be set for high to low sensitivity
Once a water leak has been detected, the controllers red “Alarm” lamp will start to flash, the audible warning device will start and the common alarm relay will close. The unit will remain in this condition even if the water is removed from the sensor. Only muting the alarm will stop the sounder, turn on the lamp permanently and de-latch the alarm. If water is removed from the sensor before pressing the “Mute Alarm” button, after Muting the alarm lamp will extinguish indicating that no water is present and the common alarm relay de-energise.
However if water is still being detected only the audible warning will stop leaving the lamp permanently on and the relay energised. Only when the water has been removed will the lamp extinguish and the relay de-energise.
All LD units have a common alarm set of volt free contacts for onward signalling to Building Management Systems, telephone dialler, control systems and Water Shut Off valves.
Each zone is provided with a sensitivity potentiometer, this has been provided to allow individual zones to be set to high sensitivity for sensitive areas or low sensitivity for areas known to experience high humidity or water splashes.
Unlike other water detection units on the market, the LD range from CMR electrical uses a bi-directional (AC) signal within the sensors. Using alternating current stops electrolyses which causes the sensors to disintegrate and a system unable to detect water. The use of alternating current also allows the sensors to be continually monitored even when submersed in water. This allows the system to self reset after water has been removed for the sensor and no further action to reinstate or reset the system is required from the operator
- Housing type – ABS Plastic
- Mounting – Wall, flush or surface
- Size – 200mm wide x 150mm high x 78mm deep
- Colour – Light grey
- Input power – 50 Hz single phase 230VAC +/- 10%
- Burden – < 3VA
- Power termination – Internal terminal block
- Voltage to sensor – Bi-directional (AC) 12VDC
- Connections to sensor – Internal terminal block
- Access – Top, bottom or back
- Output contacts – Common Alarm & Common Fault