Supply Water Leakage Protection System BC

System BC Application:
Domestic and commercial installations

  • Flow meter with high-speed pulser
  • BC flow computer
  • Cutoff valve
Ill.: system BC-3.5-V1

Monitoring Functions

Issued when the volume of a single, continuous discharge exceeds a preset limit.
A discharge is considered continuous as long as its indicated flow exceeds the preset cut-off value.

Seepage Alarm:
Issued when the flow of the installation fails for an entire test interval (normally 24 hrs) to drop below a preset limit.

System Error:
Whenever the valve is closed - manually or by tightness test or alarm -  the system checks the valve closes tightly; if not, a system error alarm (valve) is issued.
If an internal voltage supply fails, a system error alarm is issued. Excessive periods of inactivity outside of holidays cause system error alarm (meter). System error alarms do not cause installation cut-off.

Operating Modes:
Normal Mode: Discharges and seepage are monitored according to the preset parameters.
Holiday Mode: Only modest discharges permitted, typically 20 liters. Meter monitoring is disabled.
Free Discharge: The normal discharge limit may be exceeded without causing an alarm; the system automatically reverts to normal mode upon expiry of a preset time.

The BC is equipped with a run-in facility, whereby the optimal combination of monitoring parameters may be chosen for a given installation. The facility relies on a run-in period of typically 14 days, in which the BC records and stores flow measurements without any monitoring. Upon expiry of the run-in period, the BC calculates monitoring parameters corresponding to the observed consumption. Depending on the settings of internal jumpers, one or more of these parameters may be instated automatically when the run-in is complete.

Alarm Functions

On leakage errors, system BC cuts off the installation, issues alarm visibly and audibly at the front panel, and deactivates the alarm relay.
System errors are reported via an alarm relay, and visibly and audibly if possible.
Valve errors are reported visibly.


Status, Data and Alarm Indicators, Buzzer.
Keys for alarm mute and acknowledge, manual valve control, Free Discharge and Holiday select.
Two digital control inputs, three digital outputs, and two fail-safe floating SPDT alarm/signal relays.

Permissible discharge adjustable 10-20-50-100-200-500-1000-2000 liters.
Cutoff adjustable 10-20-50-100-200-500-1000-2000 l/h.

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

Valve tightness check/exercise:
Execution: 1x/day.

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


Liquid Sensor attachment:
System BC may via interface ILS-C accept up to two liquid sensors type LS-X, providing select protection of sensitive areas with optional cut-off.

By attachment of external SMS-alarm to the alarm output, system BC may text any mobile phone on alarm.


Download System BC data sheet in pdf format