MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
7.2.1 Measurement of the coefficient of performance (CP) of a gas boiler
If the pulse output of a gas meter is connected to a heat meter, the coefficient of performance of the gas boiler can
be measured, in terms of e.g. kWh/Nm
3
gas. A volume resolution which corresponds to the pulse weighting on the
gas meter pulse output must then be selected for input B.
7.3 Offset adjustment of temperature sensor measurement
MULTICAL® 403 is available with possible offset adjustment of the temperature sensor measurement, thus
increasing the accuracy of the absolute temperature measurement. This is especially relevant in the installation
scenario that the meter is to be used for tariff billing based on absolute temperatures. In that case it is an EN1434
requirement that the accuracy of the meter’s absolute temperature reading must be within ± 1,0 K. Offset
adjustment is extremely relevant in district cooling installations too. In district cooling installations the customer
often requires a maximum inlet temperature. Absolute temperature measurement with undesirable inaccuracy can
cause the supplier to supply water with a lower inlet temperature than promised, resulting in unnecessary extra
costs for the supplier.
Depending on the meter’s configuration, offset adjustment can be programmed into the meter from the factory.
Offset can also be adjusted after delivery via the meter’s ”SETUP loop” (see paragraph 6.3) or via METERTOOL HCW.
See Technical description for METERTOOL HCW (5512-2097).
Note: Depending on the meter’s configuration offset adjustment can be disabled and the menu point in ”SETUP
loop” will in that case display “Off”.
If the temperature sensor set of a meter with offset adjustment is replaced, we recommend that offset is corrected
to match the newly connected sensor set. Alternatively, offset should be adjusted to 0,00 K, which means that the
function is switched off and does not contribute to an undesirable increase of the error of the absolute temperature
measurements.
Temperature sensor offset (t
r0
) can be adjusted in the interval -0,99…0,99 K according to the meter’s approval.
Please be aware of that the required offset adjustment must be entered, not the error of the temperature sensor set.
If the selected temperature sensor set contributes with an error of -0,20 K, the meter’s offset must be set at 0,20 K.
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