MULTICAL® 801
Kamstrup A/S · Technical Description · 5512-571_R1_GB _11.2016
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Example: The below graph illustrates the difference between Mass V1 and Mass V2 during 60 days before the
leakage of an under-floor heating pipe caused a leak alarm. During the first 43 days, there is fluctuation of approx.
±
1 kg/h, which is the normal fluctuation of systems without leaks.
-2
0
2
4
6
8
10
12
14
16
400
410
420
430
440
450
460
Number of days
Le
a
k
a
ge
i
n k
gs
/hour
-2
0
2
4
6
8
10
12
14
16
400
410
420
430
440
450
460
Number of days
Le
a
k
a
ge
i
n k
gs
/hour
6.13.2
District heating burst
Every 30 seconds the current flow of the inlet pipe is compared to that of the outlet pipe. If the difference exceeds
20 % of the nominal flow at four successive measurements (120 s), info = 00512 is set and a ”burst alarm” is sent
via remote communication.
6.13.3
Cold water systems
In addition to the above-mentioned functions, MULTICAL
801 can be connected to the pulse signal from the cold-
water meter of the house. It can thus monitor the cold-water consumption. Possible running cisterns, untight
heating spirals of tap water tanks or other untightnesses will cause pulses to be received from the cold water meter
24 hours a day.
If MULTICAL
801 does not register, e.g. at least one continuous hour/day without pulses from the water meter, this
implies a leakage in the water system and an alarm will be sent via remote communication.
Cold water leak surveillance (VA)
N=
Constant leakage at no consumption (pulse
resolution 10 l/imp)
0
OFF
1
20 l/h (30 min. without pulses)
2
10 l/h (1 hour without pulses)
3
5 l/h
(2 hours without pulses)
Note: N=2 is the default value in connection with leak surveillance. Increased sensitivity, e.g. N=3, can only be
achieved by means of METERTOOL. Info codes for leakage/burst are only active when M
>
0 eller N
>
0 respectively.
6.13.4
Receipt of alarm messages
When the meter has registered a leak or burst, it sends an alarm message to a receiving station, where incoming
alarms are processed according to an encoded action pattern, which is determined for each customer, e.g. starting
with an SMS message to the customer’s mobile phone parallel with the heating station on guard receiving the
message. Regular data readings from MULTICAL
801 to receiving station/control centre ensure that defective
remote readings, if any, are detected.
