MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
3.4 Serial number and extended availability
The serial number consists of 8 digits (xxxxxxxx/WW/yy), a two-digit device code for extended availability
(xxxxxxxx/
WW/yy) as well as the production year (xxxxxxxx/WW/yy). Serial no. (factory set unique serial number) is
written on the meter and cannot be changed after factory programming.
Extended Availability
You need the encryption key of a specific meter to be able to read the meter via wireless M-Bus. This encryption key
can be retrieved directly from “My Kamstrup” on Kamstrup’s website. For customers who buy meters from
wholesalers, the encryption keys can likewise be retrieved directly from “My Kamstrup” where the customer can
create a user profile without contacting Kamstrup A/S. Next, the customer enters the meter’s serial number as well
as the two digits (device code) for extended availability and downloads the encryption key. The two digits have been
introduced in order to provide a secure method for customers who buy Kamstrup meters from a wholesaler to
obtain the necessary encryption keys.
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