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MULTICAL®
602
42
Kamstrup
A/S
∙
Technical
Description
∙
5512
‐
931_N1_GB_11.2016
6.8
Temperature measurement
MULTICAL
602 has a high resolution analog/digital converter that measures the temperatures T1, T2 and T3 with
a resolution of 0.01
C (T3 is not available on meters with 4-wire sensor inputs). The same measuring circuit is used
for all 3 temperature inputs to obtain the lowest possible measuring error on the temperature difference. Prior to
each temperature measurement an automatic adjustment of the internal measuring circuit is made on the basis of
integral reference resistances at 0
C and 100
C, respectively. This ensures a very good accuracy and a very stable
long-term operation.
Current T1
Temperature measurings are made in connection with each integration (energy calculation) and every 10 s when
the display shows temperature. The measuring circuit has a temperature range of 0.00
C…185.00
C. In case of a
disconnected temperature sensor the display shows 200.00
C and in connection with a short-circuited temperature
sensor it shows 0.00
C. In both cases the info code for sensor error will appear.
To reduce the influence from the mains frequency which can e.g. be inducted to long sensor cables, double
measurings are made with a delay of ½ period , and the average of the 2 measurings make up the temperature
measurement used for calculation and display. Supressing of the mains frequency is optimised to either 50 Hz or
60 Hz depending on the selected country code.
6.8.1
Measuring current and power
Measuring current is only sent through the temperature sensors in the short period of time it takes to measure the
temperature. However, the effective power that is consumed in the sensor elements is minimal and the influence
on the self-heating of the temperature sensors is typically less than 1/1000 K.
Pt100 Pt500
Testing current
3 mA
0.5 mA
Peak power
1.5 mW
0.2 mW
RMS power
10
W
1
W
Содержание MULTICAL 602
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