Heat transfer steam
Temperature range 100... 600 °C
1...100 bar pressure range
Pressure input mA 0/4...20
Any flow sensor with analogue signal connected
2 x Pt100 inputs for steam and condensate temperature
Coefficient calculation for IAPWS-IF97
Backlit alphanumeric LCD display (4 x 20 characters)
Built-in clock with automatic calendar to 2099
Counter for heat and steam
Resettable counters for variable periods
4 analogue outputs for instantaneous values
2 pulse outputs for M-Bus connection (optional)
Housing for snap-rail or wall mounting (IP55)
Accessories for panel installation
The heat meters WR 200-D is used for detecting the heat energy in heating or steam production systems as a heat carrier. The heat output from given in a closed system (steam condensate flowing back) is calculated using the formula:
P = Qm · (r + ΔTD · cpd + ΔTK · cpK) / 3600
P = heat output in kW
Qm = steam flow in kg / h
r = heat of vaporization in kJ / kg
ΔTD = temperature difference between steam temperature and saturation temperature
CPD = specific heat capacity of vapor in kJ / kg · ° K
ΔTK = temperature difference between saturation temperature and condensate temperature
cpK = specific heat capacity of water in kJ / kg · ° K
Subsequently, the actual flow and the current thermal power integrated over time and added up to two counters. For counting on an adjustable period, two other resettable counters in conjunction with a clock with automatic
calendar available. All measured and counted values are displayed with their physical units on an illuminated four-line alphanumeric LCD display.
The thermal coefficients of water and steam are calculated according to IAPWS-IF97 for a pressure range of 1...100 bar and a temperature range of 0...600 °C.
The meter is for the connection of any flow sensor with analog signal provided. For the pressure measurement, a further analogue input is available 0/4...20 mA.
For temperature measurement two Pt100 inputs are available in four-wire circuit.
External records, the unit provides four analog output signals 0/4.20 mA and two pulse outputs can be connected to an M-bus module. All components are housed in a housing profile for snap track mounting with external clamps. Accessories for panel mounting parts and a plastic housing for wall construction are also available.