Meters and Energy Cost Allocation Ultrasonic heat and cooling energy meters UH50.. Ultrasonic heat and cooling energy meters to measure flow and energy in hydronic heating or refrigerant circuits.
Use The UH50.. heat and cooling energy meter physically acquires energy consumption. The amount of heat or cooling energy is acquired separately and can be read out either on site or from a remote location. The device consists of a flow measuring section and processor unit. The processor unit can be equipped with different sensors, different types of power supply and communication modules. The UH50.. is used to measure the consumption of heat in district heating systems and blocks of flats.
Technical design Metering accuracy as per EN 1434 The diagram below shows the typical metering accuracy of the UH50.., compared to the error limits per EN 1434, class 2. Error limit per EN 1434 10 8 Relative errors [%] 6 4 2 0 -2 -4 -6 -8 -10 1 10 100 Flow [%/qp] Key: EN 1434, class 3 EN 1434, class 2 UH50.. typical (EN 1434, ½ class 2) The pressure loss in a flow sensor is indicated as nominal flow qp.
Nominal flow Overall qp length 3 m /h mm Connecting thread Pressure loss at qp mbar Kv value at Δp = 1 bar m3/h Curve in the diagram 2.5 130 G1 200 5.6 E 3.
324D03 Display The meter displays current readings in kWh, MWh, MJ or GJ. You can only select between kWh or MWh and MJ or GJ on the meter. *) Decimal places "flashing", "static", or "suppressed" The decimal places of displayed values are outlined to avoid errors. Calibrated values are identified by a star symbol. 2 1 1 Decimal places outlined 2 Calibrated value The number of decimal places of a value depends on the selected measuring path and the selected unit.
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. NOTICE The range of display and the displayed data may deviate from this description and certain button functions may be disabled, depending on the parameter settings on the meter.
Service loop LOOP 3 Monthly value (set day) Energy on set day Tariff register 1 on set day Volume on set day Max. flow rate on set day, at 2-second intervals with date stamp Max. power on set day, at 2-second intervals with date stamp Max. temperatures on set day, at 2-second intervals with data stamp, for temperature heat or cold side Missing time count on set day NOTICE Changing the number of months to be read via the service software impacts the number of months that can be called up via the LCD.
Previous year’s values The electronic unit stores the meter readings for energy, volume, tariff register, missing time, and flow measuring time as well as the current maximum values of flow rate, power, temperature differential, temperature heat and cold side with their date stamps on a yearly set day.
Error code Error Notes on service F7 Fault in the internal memory Replace meter F8 Errors F1, F2, F3, F5, or F6 Action is based on the error code. Service must reset pending for more than 8 hours, detection of tampering error message F8 attempts. No further measurements are made F9 Error in the electronics Replace meter Standard parameters The UH50.. comes programmed as follows: ● Set day [TT.MM]: 01.01 Power supply The UH50.. can be powered by a power supply or battery.
Batteries Standard battery (2 AA) WZU-BA+GUM Universal battery (D-cell) WZU-BDS Battery life Battery life depends on the type of battery and requirements (e.g. short timebase, analog module, etc.). NOTICE Install only batteries approved by the manufacturer. 6 years 11 years 16 years Power pack AC 110/230 V; AC / DC 24 V 2x AA cell C D Yes RF module 868 MHz (stationary, 15 sec. transmission interval) D D D Yes RF module 868 MHz (mobile, 16 sec.
GPRS module - - - Yes M-bus module G4 (Fast read mode 4 sec.) Pulse module (Fast pulses) Analog module BACnet/Modbus module (Read < 10 min.) D - - Yes Fast timebase (for timebase Q =4 s and timebase T = 4 s) D - - Yes The following table displays the modules requiring an external power supply.
Communication Communication module The communication modules are connected via a 6-pole reaction-free plug, enabling them to be installed or replaced at any time. Compliance with ESD regulations must be ensured. 1 2 1 Module 1 2 Module 2 The UH50.. meters are equipped with an optical interface as standard.
Permissible module combinations AM Analog module MB G4 M-bus module MB MI M-bus module RF RF module LoRa LoRaWAN module BACnet BACnet module Modbus Modbus module NB-IoT NB-IoT module GPRS GPRS module Step 1: Slot for module 2 is equipped with... AM (3) Step 2: AM Yes Slot for module #1 Pulse module (2) Yes "Standard" can be equipped MB G4 Yes with...
Connection terminals Multipolar connection terminals are used to connect external cables to the modules. Choice of connections: ● Solid or stranded wire 0.2…2.5 mm² ● Stranded wire with ferrule 0.25…1.5 mm² ● Cable sizes 26 – 14 AWG Multiline connection (2 lines of same cross-sectional area) ● Solid or stranded wire 0.2…0.75 mm² ● Stranded wire with ferrule without plastic 0.25…0.34 mm² sleeve ● Stranded wire with TWIN ferrule and plastic sleeve 0.5…0.75 mm² Recommended screwdriver 0.
Standard pulses Standard pulse valencies 1 kWh kWh *) MJ *) 10 kWh 1 MJ 10 MJ m3 0.1 m 0.6 100 kWh 2.5 100 MJ 3 3.5 1 m3 10 15 25 40 60 150 3 Nominal flow in m /h *) depending on the unit for heat energy display Pulses for energy, volume, and tariff register Period: >200 ms Pulse length: 100 ms conducting Pulse for operating states "Ready" Pulsed “conducting", i.e. 0.1…0.
A suitable device can be used to receive and evaluate the pulses. Enter the settings in accordance with the controller’s data sheet. Linear pulses are provided proportionally to the measured value. In the case of scaled pulses, the number of pulses at the upper and lower end of the range can be defined. In this case, the pulse receiving device can detect a wiring error, for example.
NOTICE Module WZU-MB G4 can be used in both slots. Always plug module WZU-MI into slot 1. M-bus module with 2 pulse inputs WZU-MI Function description In addition to the M-bus connection facility, the WZU-MI module has 2 pulse inputs to connect metering pulses from hot and cold water meters with Reed contact, relay or open collector. The cumulated volume is calculated based on the pulses and the set pulse valency, stored in the processor unit at 5-minute intervals and passed on via M-bus.
Technical design WZU-485E-MOD RTU communication over RS485, transmission rate up to 19200 baud, setting the transmission rate and parity of the software (USB, cable connection), refresh rate up to 10 sec. For UC50.. and for UH50.. as of firmware 5.15 and higher WZU-485E-BAC MS/TP communication over RS485, transmission rate up to 76800 baud, setting the transmission rate and parity of the software (USB, cable connection), refresh rate up to 10 sec. For UC50.. and for UH50.. as of firmware 5.
RF modules, 868 MHz WZU-RF/WZU-RF-EXT Function description The RF modules (WZU-RF and WZU-RF-EXT) enable the meter to communicate wirelessly with a control unit at 868 MHz. They support data transmission conforming to OMS and DSMR. The meter time can be set when operating in conformance with DSMR. The maximum range is 400 meters. NOTICE The module must be plugged into slot 2.
LoRa module WZU-LoRa/WZU-LoRa-EXT Function description The Long Range Wide Area Network (LoRaWAN) is a low-power network protocol. The LoRa alliance establishes the LoRaWAN specification; it is freely available and uses a special modulation technology. The LoRaWAN module sends the meter data over a LoRaWAN wireless network to an application server (control unit) that the end customer can access. The meter data is transmitted immediately after start.
NB-IoT module NB-IoT-EXT Function description The NB-IoT module sends the meter data over a NB-IoT network to an application server (control unit) that the end customer can access. The meter data is transmitted immediately after start. The mobile ‘Elvaco OTC APP’ from Elvaco can configure the module. The NB-IoT telegram has the following data points: ● Energy (kWh) ● Volume(m3) ● Power (kW) ● Flow (m3/h) ● Flow temperature (°C).
Properties ● Reading and storing measured values of the heat/cooling energy meter ● Reading and storing measured values of any metering device conforming to the M-bus standard protocol ● Collection of measured values per e-mail, FTP, http, SMS transparent GSM or TCP ● Configurable report templates for manufacturer-specific reports on values, about the system, etc.
Returned energy (tariff T8) In tariff register 1, the energy calculated from the temperature cold side is totaled (and not from the temperature differential). Heat/cooling energy meter (tariff 9) 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). Heat threshold exceeded and temperature difference > +0.
For tariff T9 (cooling energy/heat meter) No tariff register active Tariff register 1 active Tariff register 2 active The type of tariff and the associated parameters are displayed in service loop 4. For T2, T3, T4, T5, and T6 At 2-second intervals with threshold value 1/2/3 For T7 For T8 For T9 At 2-second intervals For T10 Switching times at 2-second intervals For T11 For T12 The contents of the tariff registers is displayed in the user loop after the energy.
Serial no. Description 1 F0 = Air in measuring tube 2 F1 = Interruption hot side temperature sensor 3 F2 = Interruption cold side temperature sensor 4 F3 = Error temperature electronics 5 F5 = Short circuit hot side temperature sensor 6 F6 = Short circuit cold side temperature sensor 7 F8 = Sensor error >8 hours 8 F9 = ASIC error 9 Above max. temperature in the flow measuring section 10 Below min. temperature in the flow measuring section 11 Max.
Data logger The data logger (optional) permits archiving of data that the user can select from a predefined set of values. The data logger contains 4 archives to which 8 channels can be assigned. The data can be assigned to any of the channels. The service software is used for the configuration.
Type summary The Ultrasonic heat and cooling energy meters UH50.. listed below are equipped as follows: Mounting location In return Rated pressure PN 16 (PS16) /PN 25 (PS25) Length of control cable 1.5 m/3 m Sensor mounting Return sensor integrated in the flow measuring section Return sensor integrated in the flow measuring section Installing the return sensor in the measuring tube as an option Sensor type Pt500, DS M10x1, length 27.5 mm Pt500, DS M10x1 mm, length 38 mm Pt500, Ø 5.
2.5 m3/h nominal flow rate, mounting length 130 mm, connecting thread G 1", PN 16, control cable length 1.5 m, Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.5 m, return sensor integrated in the flow measuring section, energy unit display in kWh S55561-F114 UH50-A36-00 2.5 m3/h rated flow, mounting length 190 mm, connecting thread G 1", PN 6, control cable length 1.5 m, Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.
60 m3/h nominal flow rate, mounting length 360 mm, flanged DN 100, PN 25, control cable length 3 m, Pt500, Ø 6 mm, sensor length 150 mm, cable length 5 m, return sensor not integrated in the flow measuring section, energy unit display in MWh S55561-F121 UH50-A83-00 Options Order number Type 0.6 m3/h nominal flow rate, mounting length 110 mm, connecting thread G ¾”, PN 16, control cable length 1.5 m, Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.
2.5 m3/h nominal flow rate, mounting length S55561-F255 130 mm, connecting thread G 1”, PN 25, control cable length 1.5 m, Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.5 m, return sensor installation in the measuring tube optional, energy unit display kWh UH50-C37-00 2.5 m3/h nominal flow rate, mounting length S55561-F256 190 mm, connecting thread G 1”, PN 25, control cable length 1.5 m, Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.
15 m3/h nominal flow rate, mounting length 270 mm, flanged DN 50, PN 25, control cable length 3 m, Pt500, Ø 6 mm, sensor length 100 mm, cable length 5 m, return sensor not integrated in the flow measuring section, energy unit display in MWh S55561-F128 UH50-C65-00 25 m3/h nominal flow rate, mounting length 300 mm, flanged DN 65, PN 25, control cable length 3 m, Pt500, Ø 6 mm, sensor length 100 mm, cable length 5 m, return sensor not integrated in the flow measuring section, energy unit display in MWh S5
Other types available on request. Communication modules WZU-GPRS and WZU-GPRS-ANT are supplied complete with power supply. In that case, none of the above-mentioned power supply modules need be ordered. Communication modules for UH50.. Stock no. (optional) Order number Type Pulse module with 2 channels to output standard or "definable" pulses S55563-F107 WZU-P2 M-bus module for heat and heat/cooling energy meters, generation 4, recommended as of firmware 5.
Other types available on request. Temperature sensors for UH50.. Component Order number Type Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 1.5 m LYU:WZU5-2815 WZU5-2815 Pt500, DS M10x1 mm, sensor length 27.5 mm, cable length 2.5 m LYU:WZU5-2825 WZU5-2825 Pt500, DS M10x1 mm, sensor length 38 mm, LYU:WZU5-3815 cable length 1.5 m WZU5-3815 Pt500, DS M10x1 mm, sensor length 38 mm, LYU:WZU5-3825 cable length 2.5 m WZU5-3825 Pt500, PS Ø 5.2x45 mm, cable length 1.
Mounting kit G ¾", consisting of: 2 x fittings G ¾ x R ½" 2 x union nut G ¾" 2 x gasket G ¾" S55563-F124 WZM-E34 Mounting kit 1", consisting of: 2 x fittings G 1" x R ¾" 2 x union nut G 1" 2 x gasket G 1 S55563-F123 WZM-E1 Mounting kit 1¼", consisting of: 2 x fittings G 1¼” x R 1" 2x union nut G 1¼" 2x gasket G 1¼" S55563-F125 WZM-E54 Mounting kit 2", consisting of: 2 x fittings G 2" x R 1½" 2 x union nut G 2" 2 x gasket G 2" LYU:WZM-E2.1 WZM-E2.
Spacer G 1¼”, length 260 mm, incl. 2 gaskets LYU:WZM-G260 WZM-G260 Spacer G 2", length 300 mm, incl. 2 gaskets LYU: WZM-G300.1 WZM-G300.1 Spacer DN 20, length 190 mm, PN 16, incl. 2 flat gaskets LYU:WZM-F190 WZM-F190 Spacer DN 25, length 260 mm, PN 16, incl. 2 flat gaskets LYU:WZM-F260 WZM-F260 Spacer DN 50, length 270 mm, PN 16, incl. 2 flat gaskets LYU:WZM-F270 WZM-F270 Spacer DN 40, length 300 mm PN 16, incl. 2 flat gaskets LYU:WZM-F300 WZM-F300 Spacer DN 65, length 300 mm, PN 16, incl.
Ball valve Rp ½" for mounting the sensor DS M10x1 mm, length 28 mm, max. water temperature 130 °C, PN 25 S55563-F104 WZT-K12 Ball valve Rp ¾" for mounting the sensor DS M10x1 mm, length 28 mm, max. water temperature 130 °C, PN 25 S55563-F120 WZT-K34 Ball valve Rp 1" for mounting the sensor DS M10x1 mm, length 28 mm, max.
Protection pocket G ½ B" made of brass, Ø 5.2x50 mm for sensor Ø 5.2x45 mm LYU:WZT-M50 WZT-M50 Mounting set for sensor Ø 5.2x45 mm, consisting of: - 1 sensor fitting M10x1 mm, brass - 2 O-rings - 1 grooved pin - 1 Sensor mounting aid LYU:WZT-FA WZT-FA Mounting set for sensor Ø 5.
Scope of delivery Operating and installation instructions in multiple languages are included with the ultrasonic heat and heat/cooling meters. Languages The instructions are supplied in 18 languages: Bulgarian, Chinese, Croatian, Czech, Dutch, English, French, German, Greek, Hungarian, Italian, Norwegian, Polish, Russian, Slovakian, Slovenian, Spanish, and Turkish.
Ball valve Example of mounting with a ball valve (recommended up to qp 6) Welded sleeve with protection pocket Example of mounting with protection pockets (recommended above qp 10) Required position for the cooling energy meter To avoid the formation of condensation on cooling energy or combined heat/cooling energy meters, make sure the black cover on the measuring tube points to the side or downward. Install the protection pockets so that the temperature sensor is horizontal or vertical, pointing down.
NOTICE On models with removable control wiring, you can disconnect and reconnect the wiring during installation. ● ● Connect only paired parts (volume measuring section, processor unit) when reconnecting. Note the correct pin assignment. ● Do not extend nor shorten the control wiring. Maintenance The meters are maintenance-free. Observe all national calibration regulations.
Technical data Processor unit Function data Measuring range (national approvals may differ) 0…180 °C Range of temperature differential ΔΘ 3…120 K Temperature response threshold 0.2 K. Thermal coefficient Shifting compensated Temperature-measuring error without sensor (0.5 + ΔΘmin./ΔΘ) %, max. 1.
Function data Rated pressure 1.6 MPa (PN 16; PS 16)/2.5 MPa (PN 25; PS 25) Mounting position Any Mounting location Return Nominal flow qp Installation length Connection Maximum Minimum Response flow qs flow qi threshold Pressure loss at qp Kv flow rate at Kv flow rate at Δp 1 bar Δp 100 mbar m3/h mm G/DN m3/h l/h l/h mbar m3/h m3/h kg 0.6 110 G¾ 1.2 6 2.4 150 1.5 0.5 1 0.6 190 G1 1.2 6 2.4 150 1.5 0.5 1.5 0.6 190 DN20 1.2 6 2.4 150 1.5 0.5 3 1.
Power supply optional Standard battery WZU-BA+GUM Standard battery ● Battery type ● Battery voltage ● Battery life 2 AA lithium batteries (Li-SOCI2) 3.6 V Max. 6 years Universal battery WZU-BDS Universal battery ● Battery type ● Battery voltage ● Battery life 1 D-cell lithium battery (Li-SOCI2) 3.
Communication Pulse module WZU-P2 Pulse outputs ● Number of outputs per module ● Standard pulses – Pulse value – Pulse length ● – Period duration Pulse for operating states – Pulse duration for "Ready" – Pulse duration for "Fault" ● – Period duration Fast pulses – Pulse length ● – Max. pulse frequency Fast pulses – Pulse length ● ● ● ● – Max.
M-bus module WZU-MI Part of pulse input Pulse inputs ● Number of inputs ● Module battery – Battery type – Battery voltage – Battery life ● ● ● ● ● Pulse duration (Low) Pulse duration (High) Frequency Polarity Galvanic isolation – From meter ● – From M-bus inputs Pulse value ● Display ● ● ● ● Output voltage Internal resistance Source current Pulse input closed (Low) – Switching threshold low ● – Resistance Pulse input open (High) – Switching threshold high ● – Resistance Max.
BACnet module WZU-485E-BAC ● Communication protocol ● Supported services ● ● BACnetTM address range Transmission rate ● Data update ● ● ● ● ● ● ● HW network connection RS-485 terminating resistance Alternating current Direct current Power consumption Recommended fusing Galvanic isolation – From meter: – From the RS-485 network BACnet MS/TP (RS-485) per ASHRAE 135 and ISO 16484-5 BACnet Application Specific Controller (B-ASC), BACnet Master Mode 1 … 127 9600 to 76800 bps Default: 38400 bps Standby:
Analog module WZU-AM Analog outputs ● Number of outputs ● Output variable ● Max. load at current output ● Max. load at voltage output ● Precision ● Max. cable length ● Cable cross-section ● Outputs short-circuit proof ● Galvanic isolation from meter External power supply ● Voltage range ● Power consumption ● Power consumption External fuse (not enclosed) ● < AC/DC 24 V ● ≥ AC/DC 24 V ● Breaking capacity 2 Current or voltage configurable 300 Ω 2 kΩ ≤ ±} 1% of parameterized max. value 100 m Max. 1.
RF module, 868 MHz WZU-LR / WZU-LR-EXT ● ● ● Transmission frequency Transmitter power (ERP) Range*) – Free field of view – In buildings ● Power supply Via meter **) ● – Power is supplied with a power supply Meets the standard 868 MHz 25 mW (14 dBm) 10 km 100 m Battery type D Transmission interval: 60 minutes, life: 11 years Transmission interval: 160 minutes, life: 16 years 110/230/24 V (not with Elvaco: 24 V) LoRaWAN Version 1.
GPRS module WZU-GPRS WZU-GPRS-ANT GPRS interface ● Band ● External antenna ● Logs ● ● ● Configuration Backup real-time clock Max. humidity in operation – Power supply – Voltage range – Frequency – Power consumption – Rated consumption – Overvoltage category per EN 61010-1 Class 12 850/900/1,800/1,900 MHz WZU-GPRS with magnetic base WZU-GPRS-ANT with screwed connection Email over SMTP Passive FTP mode HTTP POST and GET GMS data transparent M-bus TCP transparent M-bus SMS, HTTP, FTP, GSM CSD 12 h 80% r.h.
Ambient conditions Humidity <93% r.h. <93% r.h. <93% r.h. at 25 °C (non- at 25 °C (non- at 25 °C (noncondensing) condensing) condensing) Mechanical conditions Class M1 Max. altitude Min. 700 hPa, corresponding to max.
Dimensions Dimensions in mm Processor unit Adapter plate Cross-sectional area 51 Smart Infrastructure CE2N5324en 2021-03-19
Flow measuring section 0.6…2.5 m3/h Mounting length 110 mm (threaded) Mounting length 130 mm (threaded) Mounting length 190 mm (flanged) Mounting length 190 mm (threaded) Flow measuring section as of 3.5 m3/h with threaded connection Alternative mounting options Product no. UH50-x45 UH50-x47 qp m³/h PN bar a b c 3.
UH50-x50 6 16 260 51 G11/4 UH50-x60 10 16 300 48 G2 16 200 UH50-x63 Flow measuring section as of 3.5 m3/h Flanged Product no. qp m³/h PN bar DN UH50-x46 3.
Large meter qp 150 a 1 g 2 l 250 e Product no. qp m³/h PN bar UH50-xA1 150 16 150 500 91 300 240 23 8 211 31 UH50-xA2 150 25 150 500 91 300 250 28 8 211 31 Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.
