Applications
Steam/heat (quantity)
Application areas
Calculation of a mass circuit (mass flow) and the heat quantity contained at the output of a
steam producer or at individual users.
Measurements
Measurement of operating volume, temperature and pressure in a steam network.
Inputs
• Super-heated steam: Flow (q), pressure (p), temperature (T)
• Saturated steam: Flow (q), pressure (p) or
Flow (q), temperature (T)
Calculated values
• Calculation of: mass flow, heat flow, density, specific Enthalpy, (IAPWS–IF97 Standard).
• Only 2 inputs are required for saturated steam calculations (flow, pressure/temperature), the
missing input is calculated using the internally memorised saturated steam curves.
Note!
For higher accuracy or for control purposes it is recommended to calculate the steam condition using 3 inputs
(super heated steam). This is recommended because in this operating mode the wet steam alarm function (see
outputs) can be used.
Output values /display at unit
• Heat flow, mass flow, flow (operating volume), temperature, pressure, density, specific
Enthalpy.
• Heat quantity sum, mass sum, flow sum
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.
• If a relay is set up for the “wet steam alarm”, this will operate as soon as the super-heated
steam reaches 2% of the saturated steam curve. An alarm message also appears in the
display.
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