- 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 with
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.
Specifications
Heat carrier: watersteam
Temperature range: 100...600 °C
Pressure range: 1...100 bara
Temperature inputs: 2 x Pt100 four-wire circuit for steam- and condensate temperature, from the same line no required
Pressure input: 0/4...20 mA, direct supply of a two-wire transmitter, supply voltage approx. 18 Vdc
Flow input: 0/4...20 mA, direct supply of a two-wire transmitter, supply voltage approx. 18 Vdc
Characteristics: flow input linear or square root
k-value: determination according to data from IAPWS-IF97
Display: backlit alphanumeric LCD-display, 4 x 20 characters, all counts and instantaneous values are displayed with their physical unit
Counters: 9-digit for the summation of heat and flow
Counting period: 9-digit resettable counters, built-in clock and calendar period on adjustable
Clock: built-in clock with automatic calendar up to 2099
Buffer battery: lithium battery maintains power failure, the accumulated counts
Outputs:
4 analog outputs 0/4...20 mA current values for the following: steam pressure, steam temperature, steam flow, thermal performance
2 pulse outputs for amount of heat and steam amount
M-Bus (option): M-Bus Logger M-Count 2C
Case: aluminum profile enclosure for mounting on 35 mm DIN rail
Dimensions: 134 x 106 x 72 mm (w x h x d)
Protection class: Front IP 54 to EN 60529 front, terminal side IP 20
Wall constuction: polystyrene plastic with a hinged transparent front cover
Dimensions: 218 x 166 x 112.5 mm (w x h x d)
Protection class: IP 55
Panel mounting: kit consisting of front frame, mounting screws and rods
Supply voltage: 230 Vac
Power consumption: approx. 4 VA
Weight: approx. 600 g, wall constuctionscase approx. 1,5 kg
EMC: emissions to EN61000-6-3, immunity to EN61000-6-2
Error limits: < 0,5 %
