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MULTICAL®
602
26
Kamstrup
A/S
∙
Technical
Description
∙
5512
‐
931_N1_GB_11.2016
3.7
Configuration of pulse outputs in the top module
See paragraph 10.1
3.8
>MN< Configuration of leak limits
When MULTICAL
602 is used for leakage surveillance, the sensitivity is ”M-N” in connection with configuration.
District heat leakage search (V1-V2)
Cold-water leakage search (VA)
M=
Sensitivity in leakage
search
N=
Constant leakage at no consumption (pulse
resolution 10 l/pulses)
0 OFF
0
OFF
1
1.0 % qp + 20 % q
1
20 l/h 3x10 min. (½ hour without pulses)
2
1.0 % qp + 10 % q
2
10 l/h 6x10 min. (1 hour without pulses)
3
0.5 % qp + 20 % q
3
5 l/h 12x10 min. (2 hours without pulses)
4
0.5 % qp + 10 % q
NB:
M=2 and N=2 are default values when leakage surveillance is used. Higher degree of sensitivity, e.g. M=4 can
only be obtained by means of METERTOOL.
Info codes for leakage/bursting (info 256/512) are only active when M
0 or N
0.
3.8.1
Example of District Heat Leakage level (Leak level)
In this example M=2. Having a qp=0.6 m
3
/h flowmeter, qp must be converted to l/h: qp=600 l/h.
If we assume that there has been a means flow of 50 l/h then there will be counted approximately 1200 l/day.
10 % of this value is 120 l/day. Further, 1 % of qp=600 l/h is 6 l/h equivalent to 24 x 6 l/h = 144 l/day. Leak level
in this case will be 120 + 144 = 264 l/day or equivalent of 11 l/h.
3.9
>T< Configuration of encryption level
MULTICAL
602 must be ordered with encryption of data transmission. 128 bit AES counter mode encryption is
used for encryption of data.
The encryption level cannot be changed after production.
Encryption level
T=
2 Encryption with common key (customer specific)
3
Encryption with separately forwarded key (individual key)
T=2
A common, customer specific encryption key is used to read the meters. The encryption key is created by
Kamstrup. or specified by the customer. A customer can have several different encryption keys, eg. one for each
meter type.
T=3
The meter can only be read if the reading system recognizes the individual meter’s encryption key.
The encryption key is forwarded to the customer and ”matched” with the individual meter’s serial number in the
reading system.
If the encryption key is lost, the meter cannot be read. A new encryption key must be supplied by Kamstrup.
Only encrypted data via the base modules can be read by Wireless M-Bus.