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Product view
3
Product view
3.1
Product design
1
Front cover
2 Connection diagram (inside of front cover)
3 Pluggable calculator
4 Motherboard with connection
5 Clip-on holder for top-hat rail
3.2
Functional description
A heat or cooling meter is composed of the following
individually approved sub-assemblies:
1
Energy calculator
2
Temperature sensor for forward
3
Temperature sensor for return
4
Flow meter
The thermal output (P) of a pipe-conduit network is
based on a measurement of the flow temperature,
return-flow temperature and volume flow of the
heat transfer medium.
P = Volume of flow × (T heat side - T cold side) × k
Flow-rate measurement
The system is compatible with all standard flow meters which use a pulse output. The pulse value should be
set as low as possible if continuous measurement or high-resolution energy metering is required.
The mains-powered CALEC® ST III can operate with contactors up to 20 Hz and electronic transmitters (NA-
MUR, etc.) with pulse frequencies of up to 200 Hz.
The flexible calculation of heat capacity and density facilitates accurate energy measurement, not only for
water circuits, but also for a variety of other heating or refrigeration media.
The point of installation of the flow meter is crucially important, because the volume-to-mass conversion is
based on the temperature detected at this point.
It is preferable to fit the flow meter to the section of the line where the temperature is closest to room tem-
perature.
3-140-UM-EN-02
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forward
return
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