Endress+Hauser RMS 621 - Page 85

Applications
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:
a) Super-heated steam:
Up to 3 measurement points with the inputs (measurements) q, p, T
p
.
One measurement points are covered by the basic unit. 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 or relay.
b) Saturated steam:
Up to 3 measurement points with the inputs (measurements) q, p/T
p
.
One measurement points are covered by the basic unit. Expansion cards are required if
further measurement points are to be added. If only the inputs q and T are being used, 2
measurement points can be covered by the basic unit.
Diagram/calculation formula
q p T
D
E = q   (T
D
, p)  [h
D
(T
D
, p) – hw (T
K (P)
)]
E: Heat quantity
q: Operating volume
: Density
T
p
: Temperature (steam)
p: Pressure (steam)
h
D:
Specific Enthalpy of steam
h
W:
Specific Enthalpy of water
T
K:
Condensation temperature (calculated from the pressure at the inflow)