Five to Eight Zone Alarm type LD8-2

The LD8-2 has been designed to monitor up to eight independent zones for water leaks in areas such as tea points, server rooms and drip trays and raise an alarm when water touches the leak detection cable or spot probes. As standard, the unit comes with a touch screen graphic display, an audible warning device, internal alarm and fault relays for onward signalling and individual zone sensitivity adjustment. The system on request can also be provided with battery backup, beacon or beacon sounder, individual zone alarm relays for BMS interface and SMS text messaging.

If automatic water shutoff  is required, our LD8-2V unit is supplied with water shutoff valve control, a shutdown valve override system to allow water flow whilst the unit is still detecting water and internal shutdown valve “closed” lamps to show the status of the shutoff valves.

Specification

All of the information below is available in our LD8-2 water leak alarm data sheet.

The LD8-2 range has been designed to monitor eight independent zones in critical areas for water leaks via linier detection cables or spot sensors . Any number of spot sensors or a maximum of 50 metres of linier water detection cable can be connected to each zone.

The unit comes as standard with monitoring for disconnection / damage to any or all of the eight zones and includes the interconnecting as well as the water detection cable/ sensor. Any disconnection of any detection cable or sensor from the controller will instigate a “Fault” alarm. The unit contains an audible warning device, Mute push button, and volt free contacts for onward signalling.

• The unit can be supplied as a 5, 6, 7 or 8 zone system
• Large back lit touch screen graphic display
• With the exception of mains power, all terminals are of the plug and socket type
• 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
• Monitoring of each zone cable and sensor to ensure continuity and integrity
• On board audible warning device to alert local operators of a problem
• Alarms latched until Mute operated to give indication of transient water leaks
• Zone signal isolation to stop multiple alarms due to sensors coming into contact with Earth
• Common alarm relay contact for onward signalling to a BMS
• Common cable Fault and Mains power fault relay contact for onward signalling to a BMS
• Optional water shutoff valve control with internal valve closed lights
• Optional individual zone alarm relay contacts for onward signal to a BMS
• Optional zone alarm water shutoff valves to turn off the water source when a leak is detected
• Optional alarm output to a flashing Beacon
• Optional alarm output to a flashing Beacon and Mutable Sounder
• Optional SMS text messaging to two phone numbers
• Optional battery backup

Operation

With the system clear from any alarm or faults the display screen will show “ALL ZONES ARE CLEAR for zone status touch the screen ”. Touching the screen will display a list of all zones and their status including a smiley face. When water is detected by one of the zones, the Display will change to “ Water Detected At Zone 1 ” and a “Mute Alarm” push button will appear in the display . The audible warning devise will sound, the common alarm relay will energise and if fitted the optional BMS zone alarm relay, remote Beacon and SMS text messaging will activate. The unit will remain in this condition until the “Mute” button is operated to acknowledge the alarm even if water is removed from the detection cable. Muting the alarm will stop the sounder. If multiple alarms occur at the same time, the audible warning will start again immediately after the first muting and the display will show the next leak detected zone. Once all current zone alarm or faults have been muted, the display will change to a list showing the status of all zones (“ALARM” or “CLEAR” ) and a smiley or sad face at the end. After “Muting” the alarm, providing the water leak has been cleaned up and the detection cable dried, will automatic reset.

Each zone is provided with its own sensitivity potentiometer allowing it to be set to high or low sensitivity and should be used for areas known to experience high humidity or water splashes (low sensitivity) or areas requiring small leaks to be detected (High Sensitivity).

As standard a common alarm and common fault / power fault relay is provided that can be used for onward signal to a Building Management Systems, telephone dialler or control systems. The unit if required can also be fitted with individual Alarm relays that will advise a BMS system which zone is in alarm.

If required the unit can be fitted a 230VAC output to control Water Shut Off valves. Once a zone detects a water leak the zone shutoff valves will turn off the water source until the leak has been cleaned up. If required, the shutdown ca n be override by using the “Shutdown Override” push button. The button will only be active providing the system h as a leak and will need operating for a number of seconds until the horn stops beeping. The same procedure can be used to re-close the shutoff valve and turn off the water source again. A lamp has been provided internally to show if the water shutoff valve is “Close” This is provided for maintenance engineers.

Unlike other water detection units on the market, the range from CMR electrical uses a bi-directional (AC) signal within the sensors. Using alternating current stops electrolyses which causes the sensors to disintegrate leaving the 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. Battery backup for up to six hours can be provided, however if requested, longer backup times can be provided.