Meters and Energy Cost Allocation Ultrasonic compact heat and heat/cooling energy meter WSx8.. Ultrasonic heat and cooling energy meters to measure flow and energy in a hydronic heating circuit.
Application The heat (WSM8..), cooling (WSB8) and combined heat/cooling energy meters (WSN5..) are measuring devices to physically acquire energy consumption. The devices consist of a flow measuring section and processor unit. The processor unit can be equipped with various sensors, different types of power supply and communication modules. WSx8.. meters are employed to measure heat consumption and are also suitable for measuring cooling (alone or combined with thermal energy) in systems with water.
Optical communication interface The meter is equipped with an optical communication interface which facilitates readout and configuration of the meters on site with the help of the optical read head WZR-OP-USP and matching UltraAssist service software. Pulse inputs (optional) A meter equipped with a pulse terminal can connect up to two water meters with pulse output (reed contact only, no Namur) to heat energy meters. Consumption values for the water meters are displayed on the meter and forwarded.
Tampering Opening the cover of the meter destroys the user seal. The calibration seal in the interior of the meter must be destroyed to get to the calibration-related part of the meter. Self diagnostics The meter continuously performs self-diagnostics, allowing it to detect a number of mounting or device errors and to display them. Technical design The diagram below shows the typical metering accuracy of the WSx8.., compared to the error limits per EN 1434, class 2.
The pressure loss in a flow sensor is indicated as continuous flow qp. Actual pressure loss at the indicated flow can be calculated using the Kv value, which indicates flow at 1 bar differential pressure: The value can also be read graphically using the diagram as an alternative. Pressure loss WSx8.. BC DE F G Pressure loss in mbar A Flow in m³/h Pressure loss characteristic WSx8.. Continuous flow qp 0.6 0.6 1.5 1.5 1.5 2.5 2.5 3.
The pressure loss in a flow sensor is indicated as continuous flow qp. Actual pressure loss at the indicated flow can be calculated using the Kv value, which indicates flow at 1 bar differential pressure: 2 Δp Pressure loss in bar Q = Flow in m3/h Kv = Kv – Value at ∆p = 1 bar LCD The WSx8 has a large, easy-to-read LCD with 8 digits to display different values (e.g. energy or flow). The dynamic display enables users to identify positive flow at a glance.
S22 Error message S23 Energy supply: Mains S24-S26 Energy supply: Battery operating with capacity display S27 Module detection S28 Displays the current loop S29-S32 Tariff display 13 - 15 Key figure of the current display (LCD-ID) Display resolution The number of decimal places of a value depends on the selected measuring path and the selected dimension. The number of decimal places of a value can be modified under consideration of standardized requirements.
The meter's display is subdivided into multiple loops. A short press on button 1 enables selection of the required loop. The user loop reappears after the last loop. Press button 2 to read the value on the respective loop. The first value reappears after the last loop. The marking under the applicable symbol indicates that type of display value (e.g. previous year or previous month value). The decimal places of displayed values are outlined to avoid errors.
Loop 'Loop 0' LCD display the following value (in order): Loop head Error message (here currently no error) Current energy (here: kWh; heating energy meter; mounting location: Return, tariff to) Current volume Current value tariff register 1 (only if tariff was selected) Current value tariff register 2 (only if tariff was selected) Current value tariff register 3 (only if tariff was selected) Segment test Firmware version CRC / CMAC Month values (Loop 2) The computer stores the following values on
● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Prev. month maximum temperature hot side Prev. month maximum temperature cold side Prev. month maximum temperature difference Prev. month value energy Prev. month value volume Prev. month value tariff register 1 Prev. month value for tariff register 2 Prev. month value tariff register 3 Prev. month value volume pulse input 1 Prev. month value volume pulse input 2 Prev. month value error time Prev. month value flow time Prev. month value energy (incorrect installation) Prev.
Central European Time (CET) is the default time. Storage is performed at the appropriate times if daylight saving time is activated. Previous year values and monthly and middle of the month values can also be read out via the optical interface.
● Various – Customer number – Fabrication number – Error flags A data logger can only read out the data also sent by the data telegram by the meter. The service software can adapt the default telegram. Error messages for incorrect mounting: The meter continuously performs self-diagnostics to detect and display various error messages. Error 'Wrong direction of flow (negative)' Check whether the direction of flow arrow on the flow measuring section matches the system direction of flow of the system.
Error code Error Notes on service Short circuit in temperature sensor heat side Check temperature sensor on the heat side, replace as needed Short circuit in temperature sensor cold side Check temperature sensor on the cooling side, replace as needed Fault in the internal memory Replace meter or Errors F1, F2, F3, F5, or F6 Measures depend on the error message. Service must pending for more than 8 hours, detection of tampering reset error message F8 attempts (here: F1 longer than 8 hours).
Battery operated NOTICE Battery life depends on battery type and requirements (e.g. short timebase, communication module) and the number of installed batteries. ● Install only batteries approved by the manufacturer. 6 years 11 years 16 years 20 years Standard meter 1x AA 2x AA cell 3x AA 4x AA RF module 868 MHz (mobile, 30 sec.
Dynamic battery life calculation NOTICE Change battery Erroneous calculation of battery life ● ● The number of batteries must be configured using the service software when replacing batteries. This ensures that the meters can correctly calculate battery life. The date (month, year) the batteries are replaced can also be read out remotely via the M-bus wire or M-bus RF. Dynamic battery life calculates the probable remaining battery life. The calculation is based on meter consumption and configuration.
Connection terminals 2-pin or 4-pin terminals are used to connect external cables to the modules. ● Stripping length: 6 mm ● Choice of connections: – Fixed or flexible, 0.14…1.5 mm² – Flexible with ferrules with plastic sleeve, 0.25…1.5 mm² – Flexible with ferrules without plastic sleeve, 0.25…1.0 mm² ● ● – Wire sizes 26…14 AWG Recommended screwdriver: 0.6 × 3.5 mm Torque: 0.35…0.4 Nm The exterior diameter must be between 4 and 6 mm.
Connection of outputs M-bus module T45-M-Bus Function description The M-bus module T45-MBUS enables the meter to communicate with an M-bus central communication unit to transmit the measured values. The data in the M-bus module is up-to-date on each read out. The maximum read-out frequency is once a minute at 2400 baud or once an hour at 300 baud. NOTICE The M-bus module is equipped with a double terminal. This permits a daisy chain.
NOTICE An external antenna is required for RF module T45-RADIO-EXT with an SMA connection, e.g. WZU-ANT-MAG or WZU-ANT-WALL. The RF intelligence resides in the meter, the module is only responsible for communications. The RF meters are set by default to 'stationary'.
Antennas Antenna with magnetic base WZU-ANTMAG 868 MHz, EU-Band 8 / 20 antenna with magnetic base, 2,5 m cable, SMA/M connection, for LoRa®, NB-IoT, GPRS, wMBus communication Wall mounted antenna WZU-ANT-WALL Wall mounted antenna 868 MHz, EU-Band 8 / 20, IP65, 1.
Returned energy (tariff T6) The energy is totaled in tariff register 1 as calculated from the temperature cold side, and the reference temperature. Heat/cooling energy meter (tariff T7) In tariff register 1, the measured cooling energy is totaled; in tariff register 2, the measured heat energy. In both cases, a threshold can be defined via the temperature heat side (cold threshold, heat threshold). ● Temperature above heat threshold and temperature difference >+0.
Description F6 = Short circuit cold side temperature sensor F7 = Data storage defective F8 = Temperature sensor error > 8 hours F9 = Internal communication error F10 = CRC incoherent F11 = Flow sensor mounted incorrectly F12 = Temperature sensors mounted incorrectly W0 = Soiling prewarning W1 = Storage prewarning (F7V) W2 = Voltage drop during COM W3 = Battery must be replaced W4 = Pipe burst detected W5 = Leakage detected E0 = Mains operation E1 = Temperature in the flow sensor above 130°C E2 = Temperature
Description P8 = Master reset P9 = LCD parameterization P10 = Tariff parameterization P11 = Leakage detection parameterized P12 = Datalogger parameterization Type summary Heat energy meters WS8.. and combined heat/cooling energy meters WSN8..
The following accessories are included with the sensor types: Sensor type Supplied accessories M10x1 mm, sensor length 27.5 mm 2 flat seals ¾" or 1" 1 sealing set Ø5.2 mm, sensor length 45 mm 2 flat seals ¾" or 1" 1 sealing set 1 Adapter kit, consisting of: ● 1 sensor adapter ● 1 O-ring ● 1 mounting aid M10x1 mm, sensor length 38 mm 2 flat seals 1 ¼" 1 sealing set Various other meters available upon request. Heat energy meter with sensor M10x 1 mm, sensor length 27.
Heat energy meter with sensor M10x 1 mm, sensor length 38 mm Options Order number Type Continuous flow 3.5 m3/h, mounting length 260 mm, connecting thread G 1¼", battery life 6 years, M-bus wired communication, 2 pulse inputs S55561-F284 WSM843-FDBAE3A Continuous flow 6 m3/h, mounting length 260 mm, connecting thread G 1¼", battery life 6 years, M-bus wired communication, 2 pulse inputs S55561-F285 WSM853-FDBAE3A Heating energy meters with sensor Ø5.
Combined heat/cooling energy meters with sensor M10x1 mm, sensor length 27.5 mm Options Order number Type Continuous flow 0.6 m3/h, mounting length 110 mm, connecting thread G ¾", battery life 11 years, M-bus wired communication, 2 pulse inputs S55561-F275 WSN805-FBBBF3 Continuous flow 1.5 m3/h, mounting length 110 mm, connecting thread G ¾", battery life 11 years, M-bus wired communication, 2 pulse inputs S55561-F276 WSN821-FBBBF3A Continuous flow 2.
Communication input/output modules Component Order number Type M-Bus wired module LYU:T45-MBUS T45-MBUS Pulse module LYU:T45-PULSE T45-PULSE RF module, 868 MHz, for stationary and mobile read out LYU:T45-RADIO T45-RADIO Pulse input set for water meters LYU:T45-PULSE-IN T45-PULSE-IN RF module, 868 MHz, for stationary and mobile readout with connection for external antenna LYU:T45-RADIO-EXT T45-RADIO-EXT Antenna with magnetic base LYU:WZU-ANT-MAG WZU-ANT-MAG Wall mounted antenna LYU:WZU-AN
Component Order number Type M10x1 mm (WZT-K34) 1x spacer 110 mm (WZM-G110) 2x flat seals LYU:WZT-MS130 Mounting 130 mm, consisting of: 2x ball valve Rp 1" with union nut G 1" (WZTK1-1) 1x ball valve Rp 1" with connection for the direct installation of temperature sensors M10x1 mm (WZT-K1) 1x spacer 130 mm (WZM-G130) 2x flat seals WZT-MS130 Adapter piece 110 mm G ¾" to 130 mm G ¾": 1x extension G ¾ B" to G ¾ B" 1x gaskets G ¾" WZM-V130 LYU:WZM-V130 Adapter piece 110 mm G ¾" to 130 mm G 1": LYU:WZM-V1
Component Order number Type Ball valve R½" with union nut G ¾" LYU:WZT-K12-34 WZT-K12-34 Ball valve R¾ " with union nut G ¾" LYU:WZT-K34-34 WZT-K34-34 Ball valve R¾ " with union nut G 1" LYU:WZT-K34-1 WZT-K34-1 Ball valve R1" with union nut G 1" LYU:WZT-K1-1 WZT-K1-1 Ball valve R 1 ¼" with union nut G 1 ¼" LYU:WZT-K54-54 WZT-K54-54 Ball valve R ½" to install a DS sensor M10 x 1 mm, length = 28 mm, max.
Component Order number Type Protection pocket G ½ B x G ¼, stainless steel, mounting length 100 mm, for temperature sensor Ø 6.0x100 mm and universal sensor Ø 6.0, including copper gasket G½" LYU:WZT-S100 WZT-S100 Protection pocket G ½ B x G ¼, stainless steel, mounting length 150 mm, for temperature sensor Ø 6.0x150 mm and universal sensor Ø 6.0, including copper gasket G½" LYU:WZT-S150 WZT-S150 Protection pocket G ½ B made of stainless steel, with threaded hole G ¼", mounting length 210 mm, incl.
Component Order number Type Temperature sensor pair Pt500, DS M10x1 mm, LYU:WZU5-3825 sensor length 38 mm, cable length 2.5 m WZU5-3825 Temperature sensor pair Pt500, PS Ø 5.2x45 mm, cable length 1.5 m LYU:WZU5-4515 WZU5-4515 Temperature sensor pair Pt500, PS Ø 5.
Notes Mounting Flow measuring section Compare the mounting location with the symbol on the LCD ( or ) to determine the mounting location. Adapt the mounting location to local conditions as needed. On heat energy meters or combined heat/cooling energy meters, the mounting location of the cooling side corresponds to the return the flow .
Ball valve Fig. 2: Fig. 6: Integrating with ball valves (recommended up to and including DN25) Fig. 3: Fig. 7: Integration for circuits with mixing; placement of the temperature sensor Fig. 4: Fig. 8: Integration for circuit with e.g. throttling circuit (flow sensor in the direction of flow prior to control valve / differential pressure controller) Please note the following torques for tightening screws and bolts on the meter: ● Screws on lock to the device cover (Fig. 1, No.
Processor unit The ambient temperature of the processor unit cannot exceed 55 °C. Avoid direct sunlight. Ensure that no water can enter the processor unit at the mounting location. For water temperatures between 10 °C and 90 °C, the processor can be secured to the flow measuring section. For water temperatures above 90 °C and/or below 10 °C, mount the processor unit on the wall (split mounting). The adapter plate on the wall or the flow measuring section can be aligned as needed to ensure ease of reading.
Disposal The device is considered an electronic device for disposal in accordance with European Directive and may not be disposed of as domestic waste. ● Use only designated channels for disposing the devices. ● Comply with all local and currently applicable laws and regulations. ● Dispose of empty batteries at designated collection points. Warranty service The application-specific technical data is guaranteed only in combination with the Siemens products listed in the 'Device combinations' section.
Technical data Processor unit Power supply Battery type Lithium battery (can be replaced) Battery voltage 3.6 V Lithium content of the AA cell 0.65 g per battery Battery life 6, 11, 16 or 20 years Number of batteries per meter 1 to 4, depending on configuration Processor unit Temperature measuring range 0…180 °C Range of temperature difference ΔT 3...120 K Temperature response threshold <0.2 K Thermal coefficient Shifting compensated Temperature-measuring error without sensor (0.5 + ΔΘmin.
Function data Meterological class - 1:100 1:100 1:100 1:100 1:100 Maximum flow qs m3/h 1.2 3 5 7 12 Minimum flow qi l/h 6 15 25 35 60 Response threshold (variable) l/h 2.4 6 10 14 24 Max. overload (2.8 x qp) m3/h 1.7 4.
Communication Power consumption Max. 1 M-bus load (1.5 mA) Disconnect/connect Galvanically isolated Addressing - ● Meters Primary and/or secondary ● Pulse inputs Primary and/or secondary Baud rate 300 and 2400 baud with automatic baud rate detection Max. permissible reading frequency 1x per minute at 2400 baud 1x per hour at 300 baud Protocol Per EN 13757-2 Conformity OMS M-bus RF interface Send mode T1 and C1 Transmission frequency at T1 / C1 868.95 MHz (868.928 … 869.
Communication Pulse input 2: Signal to terminal 67, ground to terminal 68 Max. current Max. 3 μA Max. pulse frequency 2 Hz Minimum pulse length 10 ms Polarity Active low Max.
Environmental compatibility The product environmental declaration A5W00080753A *) contains data on environmentally compatible product design and assessments (RoHS compliance, material composition, packaging, environmental benefit, and disposal).
Dimensions Fig. 6: Fig. 1: Dimensions Processor Fig. 7: Fig. 2: Top view and cross section of the adapter plate Fig. 8: Fig.
Fig. 9: Fig. 4: Overview of dimensions mounting length 130 mm (threading) Fig. 10: Fig. 5: Overview of dimensions mounting length 190 mm (threading) Fig. 11: WSx8xx_Massbild_260mm_1 Fig.
Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies Document ID 023_A6V11905989_en Edition 2022-01-07 © Siemens Switzerland Ltd, 2020 Technical specifications and availability subject to change without notice.
