MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
4.9 Sealing
According to EN 1434 MULTICAL® 403 must have protection devices, which can be sealed to the effect that after
sealing, both before and after the heat meter has been correctly installed, it is impossible to dismount, remove or
change the heat meter or its adjustment devices without visibly damaging meter or sealing. Correct sealing of
MULTICAL® 403 includes two levels, installation sealing and verification sealing; a breaking of the sealing has
different consequences on each level.
Installation sealing
Having completed the installation of MULTICAL® 403 installation sealing is the last thing to be done. The installation
seal is the ‘outermost’ sealing level to be completed by the installer/utility. The Installation sealing must make sure
that calculator top and base cannot be separated and that temperature sensors cannot be dismounted without
visible signs that a separation has taken place. In practice the installation sealing can be done by means of wire and
seal, sealing label or a combination of the two. The sealing is the utility’s security that unauthorized persons cannot,
undiscovered, change the installation around the meter. Breaking the installation sealing alone does not influence
the meter’s possibility of renewed installation sealing, or the fact that it is legal in relation to its approval and
verification.
Installation sealing and ”SETUP loop”
In order to bring MULTICAL® 403 back to ”SETUP loop” after installation, calculator top and base must be separated,
after which ”SETUP loop” can be accessed either via front keys or via METERTOOL HCW. Separation of calculator top
and base implies that the calculator’s installation seal is broken.
Verification seal
The verification sealing of MULTICAL® 403 consists of both mechanical and electronical sealing. The verification seals
marked “LOCK” and “TEST” are placed on the grey verification cover in the calculator top. These seals can be seen as
the ‘innermost’ sealing level, which may only be broken by authorized laboratories in connection with test and
reverification of the meter. If the meter is to be used for legal operation in relation to approval and verification after
breaking of the verification sealing, the broken seals must be resealed. The sealing must be carried out by an
authorized laboratory using the sealing mark (void label) of the laboratory.
4.10 Pressure loss
Pressure loss in a flow sensor is stated as max. pressure loss at q
p
. According to EN 1434 maximum pressure must
not exceed 0.25 bar.
The pressure loss in a sensor increases with the square of the flow and can be stated as:
where:
Q = volume flow rate [m³/h]
kv = volume flow rate at 1 bar pressure loss [m³/h]
∆p = pressure loss [bar]
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