WZMC-402 Ultrasonic Apartment Energy Meters

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1 Product sheet MT8.36 Meter Type WZMC-402 WZMC-402 Ultrasonic Apartment Energy Meters WZMC-402 is used for metering heat in small and medium-sized central heating plants and district heating plants, typically in single or multi-family houses and in blocks of flats. The meter is very simple to install, read and verify. In addition, WZMC-402 contributes to keeping the annual operating costs at a minimum with its unique combination of large measuring accuracy and long lifetime. WZMC-402 calculates the thermal energy based on the measured differential temperature between flow and return flow, the measured water quantity, as well as internal table correction for density and enthalpy. Flow is measured with ultrasound according to the transit time method, and all measurements, references, display readings, calculations and data communication are controlled by a microprocessor and an ASIC. In addition, WZMC-402 totalizes the consumption of 2 water meters with pulse output, and thereby a total reading of thermal energy and tap water consumption is obtained. Via an internal module WZMC-402 can be remotely read by means of RS232, M-Bus, modem or radio system. Model Type Model Description WZMC Ultrasonic Heat Meter, DN15 G¾B, Screwed up to 0.6m3/h, Valve Body 110mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets WZMC Ultrasonic Heat Meter, DN15 G¾B Screwed up to 1.5m3/h, Valve Body 110mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets WZMC Ultrasonic Heat Meter, DN20 G1B Screwed up to 3.0m3/h, Valve Body 130mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets WZMC Ultrasonic Heat Meter, DN25 G11/4B Screwed up to 3.5m3/h, Valve Body 260mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets WZMC Ultrasonic Heat Meter, DN25 G11/4B Screwed up to 6.0m3/h, Valve Body 260mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets WZMC Ultrasonic Heat Meter, DN40 G2B Screwed up to 10.0m3/h, Valve Body 300mm. Incl. Pt500 Sensor Set with 1.5m Cable, 2 Stainless Steel Pockets OPTIONS (please select) Power Supply: Battery, 24Vac or 230Vac Power Supply Communication: Impulse Output or M-Bus Sensors: Standard 1.5m Cable, Upgrade to 3.0m Couplings: As required PS MT8.36-1/5

2 Features "Long-Life" Ultrasonic Heat Meter Large Dynamic Range 12 years of battery operation, or 24VAC or 230VAC Power Supply M-Bus Data Communication Option 2 Pulse Inputs for Water Meters (with M-Bus option) Pulse Output for Energy MID Approval Optical Data Reading Option Technical Data - Electrical Display LCD Display with 7 Digits Remote Communication Options Battery Impulse Output M-bus (according to EN ) Lithium 3.65VDC D-cell Lithium Replacement Interval Mounted on the wall: 12 Tbat < 30 C Flow sensor mounted: Tbat < 40 C Fast Mode: Tbat < 30 C Back-Up Supply Integral super-cap eliminates operational disturbances due to short-term power cuts Mains Supply (Options) Amb Temperatures Protection Class Dimensions 230VAC +15/-30%, 50Hz 24VAC +/-50% C IP54 W118 x H144 mm Mechanical Metrological Class 2 and 3 Certification EN 1434 Class A Nominal Pressure PN16 Installation Horizontal / Vertical / At an Angle Temperature Medium Water C (Above 90 C flanged meters recommended. Mount calculator on wall) Temperature Sensors Type Pt500 EN60751 Cable Length 1.4m (as standard), 3.0m cable on request M-Bus Interface Interface M-bus accordance with EN Readable Data Serial number, energy value, cut-off date value, volume, flow rate, heating power, supply and return temperature, temperature difference, pulse input counter values Accessories and Options Model Description WZMC-402-BAT Battery Power Supply WZMC V 24VAC Power Supply WZMC V 230VAC Power Supply WZMC-402-M-BUS M-Bus Communication Module with Pulse Inputs WZMC-402-IMP Data/Pulse Output Module (pulse output for secondary energy CE) WZMC-402-SEN m Pt500 Sensor Upgrade WZMC-402-CON-DN15 G¾B to R1/2" Coupling Set WZMC-402-CON-DN20 G1B to R3/4" Coupling Set WZMC-402-CON-DN25 G11/4B to R1" Coupling, Single WZMC-402-CON-DN40 G2B to R11/2" Coupling, Single Detailed Description WZMC-402 is a static, ultrasonic thermal heat meter, designed for measuring energy in all types of heating installations where water is used as the heat-conveying medium. According to EN 1434 WZMC-402 can be described as a "hybrid instrument" also called a "compact meter". In practice this means, that flow part and calculation unit must not be separated. If flow part and calculation unit have been separated and the seals thereby have been broken, the meter will no longer be valid for billing purposes, and the factory guarantee will no longer apply. PS MT8.36-2/5

3 Ultrasonic measuring and microprocessor technology are the foundation of the energy meter. All circuits for calculating, measuring temperature and flow are combined in a single board construction, which not only gives a compact and rational design but also ensures an optimal measuring quality and a high degree of reliability. Bidirectional, ultrasonic technique is used to measure the volume, based on the transit time method. A method which is widely recognised as being the best measuring principle currently available for this type of application owing to the long-term stability. Two ultrasonic transducers send sound signals both against and with the flow direction. The ultrasonic signal travelling with the flow reaches the opposite transducer before the signal travelling against the flow. The time difference between receiving the two signals is converted into a flow quantity. Accurately paired Pt500 sensors (in accordance with EN 60751) measure the temperature in the flow and return pipes. The short direct sensor construction is designed in accordance with EN and is, therefore, suitable for installation in a wide range of standard ball valves and fittings. In connection with union meters G1 one temperature sensor can be fitted directly into the flow part, thereby simplifying the installation. The accumulated thermal energy can be displayed in kwh, MWh or GJ all shown in seven digits with the measuring unit. The display has been specially designed with a view to longevity and optimal contrast in ambient temperatures ranging from C. Other values displayed include accumulated water consumption, operation hour counter, actual temperature measurement and momentary flow and power measurements. WZMC-402 can also be configured to record target date, peak power, information code, actual date and user-defined tariffs. To maximise safety, all registers are stored at hourly intervals in an EEPROM, which also stores monthly data for the previous two-year period. WZMC-402 has two ports for data communication. The optical eye on the front panel complies with EN standard and facilitates reading of consumption data, data logger and on-line serial PC-connection when configuring the energy meter.a split multiplug is placed beneath the top cover. The top part of this plug is used to verify the meter. The lower part is used when connecting communication modules such as M-Bus. Meter Flow Information Part No Nominal Flow Max. Flow Min Flow (l/h) Min. Cut Off (lh) Pressure Loss qp bar) WZMC G3/4B 110 WZMC G3/4B 110 WZMC G1B 130 WZMC G11/4B 260 WZMC G11/4B 260 WZMC G2B 300 Length Accuracy The accuracy of the parts of the unit are stated as below:- Sub-Units of the Heat Meter MPE According to EN MC402, Typical Accuracy Flow Senso ±( qp/p)% ±( qp/p)% Calculator ±(0.5 + dt min/dt)% ±( /dt)% Sensor Set ±( dt min/dt)% ±( /dt)% PS MT8.36-3/5

4 WZMC-401 qp dt 30K EN WZMC-401 HM WZMC-401 typical accuracy compared to EN Volume Device Installation The WZMC volume part may be installed horizontally, vertically or at an angle. The plastic calculator box must NOT be mounted facing upwards. WZMC volume part can be mounted horizontally, vertically or at any angle. WZMC volume part can turn up to max. 45 upwards and down to 90 downwards in relation to the pipe axis. WZMC must NOT be mounted the plastic box facing upwards. Volume Device Dimensions (DN15 and DN20) Nom Size L M H2 A B1 B2 H1 WZMC DN15 G3/4 110 L/ WZMC DN15 G3/4 110 L/ WZMC DN20 G1 130 L/ Weight (kg) PS MT8.36-4/5

5 Nom Size L M H2 A B1 B2 WZMC DN25 G11/4 260 L/ WZMC DN25 G11/4 260 L/ Weight (kg) Pressure Drop Curve 1 Dp WZMC-401 Pressure Drop A B C p[bar] 0,1 0,01 0, Flow [m³/h] Graph Nom Size Kv Q@0.25bar A 0.6 & 1.5 DN15 & DN B 3 & 3.5 & 6.0 DN20 & DN C 10 DN PS MT8.36-5/5