Supply Water Leakage Protection

System LMI-B

system LMI-B Ill.: System LMI-B


Small institutions

  • Intake flow meter
  • Cutoff valve ¹)
  • Control unit

Monitoring Functions


System LMI-B permits the continuous discharge of a preset amount of water. If this amount is surpassed in a single discharge, a Max Alarm is issued, and the water supply is cut off. ¹)

System LMI-B checks that water flow in the installation can drop and remain below a preset level for a preset time duration, and will issue a seepage alarm and cut off the water supply ¹) if this fails to occur daily.

System Error:
System LMI-B checks that the flow meter issues impulses regularly, unless the Holiday function is active.
Whenever the valve is closed - manually or by alarm -  system LMI-B checks its tightness. ¹)
If a component fails, a System Error is issued. The water supply is cut off for meter errors. ¹)

Supply Error:
System LMI-B monitors the mains supply and all internal supplies. If either of these fail, a Supply Error is issued. This may not cause a cut-off of the water supply.

Alarm Functions

On leakage and meter errors, system LMI-B will cut off the water supply ¹), issue visual and audible alarms, and activate the alarm relay.
Supply errors are reported via the alarm relay, and possible also visibly and audibly.
Valve error are reported visibly.

Type LMI-B-V0 is used where firefighting hoses or sprinklers are part of the monitored supply water installation. This type must always be connected to an alarm- or dialout system.


Controls and Indicators:
Operation, alarm and state indicators, buzzer.
Buttons for temporary free discharge selector, holiday function and alarm acknowledge.

Leakage Monitor:
Permissible single discharge selectable 125, 250, 500 eller 1000 litres.
Flow minimum to terminate discharge 15 l/h.
In holiday mode, permissible single discharge is 20 litres regardless of setting.
Free discharge of preset duration 1-8 hours.

Seepage Monitor:
Seepage tolerance 2, 4 or 8 litres in 30, 60 or 120 minutes. Observation interval 24 hours.

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


Liquid Sensor Attachment:
System LMI-B accomodates via interface ILS-C up to two liquid sensors LS-X, whereby the system offers point protection of a particularly sensitive area so that the water supply may be cut off on Liquid Sensor alarm if desired. ¹)

By attachment of an external SMS-alarm to the alarm relay output, system LMI-B can ship a text message to a selected mobile phone number.

Installation diagram system LMI-B
system diagram LMI-B
1: Control Unit   2: Flow Meter   3: Cutoff Valve ¹)

¹) not applicable to type LMI-B-V0

System Capacity and pressure loss Dimensions
Nom. cap.
Qn (m³/h)
 ΣΔp@Qn Equivalent
Kvs (m³/h)
(mvs) (kPa) Flow meter Cutoff valve
LMI-B 1,5 1,1 11 3,3 ½" x 110 mm ¾" x 76 mm
LMI-B-V0 1,5 1,1 11 3,3 ½" x 110 mm

EAN/UPC ordering codes here

Download System LMI-B datasheet in pdf-format