Supply Water Leakage Protection System BBU/BXU

System BBU/BXU

One-family homes with normal water consumption pattern

  • Kamstrup MULTICAL®61/62 Water Meter
  • BBU/BXU Control Unit
  • Cut-Off Valve
  • Plug-in Data Module
Ill.: System BBU

Monitoring Functions

Max. Alarm is issued when a contiguous discharge exceeds a preset limit.
A discharge is considered contiguous as long as the indicated flow exceeds the preselected cut-off setting.

Seepage Alarm:
Seepage Alarm is issued when the flow in the installation has failed to drop below a preselected value for a full test interval (24h).

System Error:
System Error is issued when the cut-off valve fails to shut tight; when an internal voltage supply fails, when the Kamstrup MULTICAL® indicates a functional error, and when no flow is registered for an extended time in the Normal (as opposed to Holiday) Mode.
System Error does not cause cut-off of the installation.

Operating Modes:
Monitoring is undertaken with different sensitivities for High and Low Consumption Phases. Switching between phases is done using the Holiday button.
Activating 'Unlimited' allows exceeding the set discharge limit without causing an alarm; this condition is automatically reset upon expiry of a preset time, or before that by renewed activation of the 'Unlimited' button.

Alarm Functions

On leakage errors, System BBU/BXU will cut off the installation, issue alarm audibly and visibly, and activate the alarm relay.
System errors are reported via the alarm relay, and audibly and visibly if possible.


Controls and Indicators:
Status, Data and Alarm Indicators, buzzer.
Keys for Mute and Alarm Reset, manual valve control, Unlimited and Holiday.
Two fail-safe alarm/signal relays with floating SPDT contacts.

Discharge Limit 10-20-50-100-200-500-1000-2000 liter.
Cutoff Limit 10-20-50-100-200-500-1000-2000 l/h.

Seepage Alarm:
Idle Period 10-20-50-100-200-500-1000-2000 sek.
Tolerance 1-2-5-10-20-50-100-200 impulses

Valve Tightness Check:
Execution: 1x/døgn.

Mains Connection:
230V 50Hz L/N/PE via key switch.
Power consumption max 20VA.


Liquid Sensor Attachment:
Via interface ILS-C, System BBU/BXU may accommodate up to two Liquid Sensors type LS-X, allowing monitoring of sensitive areas with optional cut-off of the water supply.

Attaching an external SMS-Alarm to the BBU/BXU alarm output lets the system send a text message to one or more mobile phones on alarm.

Download System BBU/BXU data sheet in pdf format