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MULTICAL®
602
58
Kamstrup
A/S
∙
Technical
Description
∙
5512
‐
931_N1_GB_11.2016
6.14
Leak surveillance
6.14.1
District heating installations
The leak surveillance system is primarily intended for directly connected district heating installations, i.e.
installations without heat exchanger between the district heating network and the heating system of the housing.
The surveillance system consists of two water meters based on the ultrasonic principle placed in both inlet and
outlet pipe, and of temperature sensors in both pipes. In addition, the electronic unit MULTICAL
602, which in
addition to calculating the heat energy also surveys the mass difference (temperature compensated volume) that
may appear between inlet and outlet pipe.
If a difference of more than 20 % of the measuring range (corresponding to 300 l/h in a single-family house) is
registered, an alarm will be sent within 120 s via remote communication.
Small leaks from 15 kg/h and upwards for qp 1.5 m
3
/h are under surveillance on the basis of a 24-hour average to
rule out incorrect alarms as a consequence of air pockets and fast flow changes e.g. from hot-water exchangers.
District heating leak surveillance (V1-V2)
M=
Sensitivity in leak
surveillance
0 OFF
1
1.0 % qp + 20 % q
2 1.0 % qp + 10 % q
3
0.5 % qp + 20 % q
4
0.5 % qp + 10 % q
NB:
M=2 is a default value when leak surveillance is used. Higher degrees of sensitivity, e.g. M=4 is only possible
by means of METERTOOL. Please see 3.8.1 for an example of how the sensitivity is calculated.
Info codes for leak/bursting are only active when M
0 or N
0, respectively.
Tap water meter
with pulse output
For radiators and
vessel/exchanger
District heating
connection
Cold-water
connection
Ultrasonic meters in
inlet and outlet
MULTICAL
heat meter with
remote reading
(E.g. integral radio module)
Main valve
Tap water
Shut-off valves
Check valve