Heat energy meter for steam

Heat transfer steam
Temperature range 100… 600 °C
1…100 bar pressure range
Pressure input mA 0/4…20
Any flow sensor with analog 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 analog 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 analog 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.

Operating mode:
Measuring mode
Measured medium:
Measuring transducer:
Temperature range:
-50 … 0 … + 250 ° C
Temperature inputs:
2 x Pt100 in four-wire circuit for supply and return temperature, No line matching required
Linear or radically
K value:
Determination according to data from IAPWS-IF97
M-Bus (Optional):
M-Bus Logger M-Count2C
4 analog outputs 0/4 … 20 mA for the following instantaneous values:
steam pressure, steam temperature, steam flow, heat output
2 pulse outputs for heat quantity and steam quantity
9 digits for the summation of heat quantity and flow rate
Period Counting:
9-digit resettable counters, period adjustable via built-in clock and calendar
Built-in clock with automatic calendar up to 2099
Buffer battery:
Lithium battery keeps the accumulated counts in the event of a power failure

Housing: Aluminum profile housing for mounting on a 35 mm standard profile rail
Dimensions: 134 x 106 x 72 mm (WxHxD)
Protection class: front IP 54 / terminal side IP 20 according to EN 60529

Wall mounting housing:
Housing: plastic polystyrene with hinged clear front cover,
Dimensions: Dimensions 218 x 166 x 112.5 mm (WxHxD)
Protection class: Front IP 54 according to EN 60529

Table setting:
Mounting kit consisting of front frame, mounting rods and fastening screws

Approx. 600 g, wall mounting unit approx. 1.5 kg

Power supply:
230 Vac (± 15%)
Power consumption:
Approx. 4 VA
Output voltage:
Approx. 18 Vdc
Output Current:
0 / 4..20 mA, direct supply of a two-phase transmitter

EN 61000-6-2, EN 61000-6-3, CE-mark
according RoHS-directive 2011/65/EU

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