Applications
Outputs
All output values can be transmitted using the output terminals, this means both unchanged
inputs as well as calculated values. Please note that the number of outputs available is dependent
on the unit type.
Number of measurement points
The number of measurement points vary according to the unit model and application. For further
details, please see the table for applications/measurement points.
In general, the following measurements are possible:
Up to 3 measurement points with the input values (measurements) q, T
1
, T
2
plus a direction
signal with flow direction change if required. Expansion cards are required if further
measurement points are to be added. Each expansion card is fitted with outputs
(analogue/impulse) for retransmission of process values. Relay outputs are also available.
Diagram/calculation formula
T
2
q T
1
Heat output (heating)
E = q (T
1,
p) [h (T
1
) – h (T
2
)]
Heat input (cooling)
E = q (T
1,
p) [h (T
2
) – h (T
1
)]
E: Heat quantity
q: Operating volume
: Density
T
1
: Temperature in inflow
T
2
: Temperature in return
p:
Average operating pressure
h (T
1
): Specific Enthalpy of water at temperature 1
h (T
2
):
Specific Enthalpy of water at temperature 2
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