Portable Heat Meter-Brochure

VD 3-180 e 02.2010ApplicationTop quality heat and cooling meters for heating, air-conditioning, cooling and solar energy plants can be realised with theCALEC® ST energy calculator. The modular unit distinguishes itself by its long-term stability. Flexible communications makesit particularly interesting for integration into building management systems.Customer advantages• Precise energy measurement for all thermal applica-tions in buildings engineering• Measurement of "heating and cooling" in a single unit• Use in cooling and solar heating systems• Choice of power supplies• Re-calibration saves process costs• Supports operation monitoring• Expandable on modular basis• Optimum LON system integration• Added logistical value thanks to optional on-site pro-gramming of pulse value and installation site of flow sensor (INIT mode)CALEC® STMulti-protocol heating andcooling energy calculatorCharacteristics• Precise measurement of thermal energy for heating,cooling and combined heating/cooling plants• Interfaces to building control systems:M-Bus, LON, Modbus, N2Open• Plug-in calculator module• Data for standard cooling media with variable properties• Integrated power supply for flow sensor• Up to 2 pulse in-/outputs or 2 analogue outputs• Metrological approval in accordance with 2004/22/EC (MID) and PTB K7.2 (cold, heat/cold combined)2ApplicationThe CALEC® ST is used for energy metering in split configuration with passive impulse-generating volume-measuring elements and P t100or Pt 500 temperature sensors in two- or four-wire version. In most cases, CALEC® ST is used with the following volume-measuring ele-ments:• Multibeam meters in the range Qp 0,6 - 10 m3/h• Hydrometric vane in the range Qp 15 - 600 m3/h• Static volume-measuring elements up to Qp 0.6 - 6’000 m3/hChoose from our wide range of volume-measuring elements. Our advisers will be pleased to help you select the right ones for your needs. Obligatory calibration and type-approvalIn most countries energy metering systems used for commercial purposes are subject to compulsory verification. The devices comprisingthe metering system must all possess official pattern approval. CALEC® ST has been approved according to both the european Measu-ring Instruments Directive 2004/22/EG and the German PTB K 7.2 directive for cooling meters.Officially verified heat meters must be reverified before the verification period has expired. The operator is responsible for compliance withthis requirement. (Re-)Verification includes all parts (temperature and flow sensors, calculator) forming the complete heat meter. The plug-in calculator module considerably reduces the cost of reverification since there are no wires to be disconnected.For testing and reverification purposes a high resolution display mode as well as CALEC® Win K are avaiable. New: Commissioning of officially verified devices is even easier as both the pulse value and the installation side can now be programm-ed in situ (INIT-Mode). Basic function and measuring principleA so-called “combined” heat meter requires the following individual devices:Electronic energy calculating device Flow sensorwith pulse generatorSupplyReturnTemperature sensorsinstalled in the supply and return pipelines 3The thermal output (P) of a pipe-conduit network is based on a measurement of the flow temperature, return-flow temperature and volu-me flow of the heat transfer medium.P = Volume rate of flow x (T heat side - T cold side) x kT heat side: For heating, flow temperature, for cooling, return temperatureT cold side: For heating, return temperature, for cooling, flow temperaturek: Heat coefficient (function considering temperature and pressure-related characteristics of the heat carrier)Energy can be determined by integration of output. The formula shows that, in order to meter energy, the specific heat and density of theheat transfer medium must be expressed in relation to the temperature of the counter mechanism. The following factors (among others)also have a decisive influence on metering accuracy:• The static accuracy and stability of the temperature-measuring procedure• The counter cycle of the temperature-measurement system, and the volume flow used to detect dynamic factorsCALEC® ST is ideally equipped for use in demanding metering tasks, thanks to:• The use for temperature-measuring purposes of a high-resolution AD converter (16 bit) designed with long-term stability in mind and equipped with self-calibration and filter functions• Short counter-cycle (mains version: 1 s)• The ability to use high-resolution mechanical or electronic flow indicators operating at pulse frequencies of up to 200 Hz (mains version)Flow-rate measurementThe system is compatible with all standard flow meters that work on the pulse output principle. Adjust the pulse value to the lowest pos-sible setting if you do require continuous measurement or high-resolution energy metering.When it is running on battery power, the CALEC® ST can handle contact makers working at pulse frequencies of up to 6 Hz. The mains-powered CALEC® ST can operate with contacts makers running at up to 20 Hz and electronic transmitters (NAMUR, etc.) with pulse fre-quencies of up to 200 Hz.The point of installation of the flow-rate meter is of vital importance, as the volume-to-mass conversion is based on the temperature de-tected at this point.It is preferable to fit the flow indicator to the section of conduit where the temperature is nearest to room temperature. Temperature measurementThe CALEC® ST is fitted with two highly-accurate temperature-measurement inputs, which are each connected to type-approved, pairedtemperature sensors in two- or four-wire configuration. The planning of systems should conform to heat meter standard EN 1434, parts 2and 6. EN 1434-4 stipulates that only sensors of the same design and length should be paired together.The counter mechanism is available in either Pt 100 or Pt 500 configuration.Thermal energy is measured from a temperature difference from dT above (respectively below) 0 K. The CALEC® ST is the ideal solutionfor air-conditioning or cooling installation when used with appropriate temperature sensors and flow meters for cooling.4Data communicationM-Bus InterfaceOn account of its standardisation (EN 13757) and features as readout busfor building management sytems (BMS), M-Bus has been used as thecommunication protocol in many instances. Advantages include:• easy installation• high cost-effectiveness• multi-vendor capability.Not only standard data such as meter readings and current values can beread out over the M-Bus interface, but also all additional data availablefrom the device, for example billing and logger values. With CALEC® STprrimary addresses and baud rates can be set with the operating keys,eliminating the need for a PC when commissioning the system.M-Bus is a single master bus, meaning that a slave can communicate withonly one master. If device data are to be transmitted to two M-Bus ma-sters then this will only be possible with devices having two M-Bus inter-faces. In such cases CALEC® ST can be fitted with a second M-Bus inter-face.LON interfaceA LON network can combine BMS and meter readout in one system. LON (Local Operating Network) is a multi-master system with intelli-gent nodes which can use different transmission media. For CALEC® ST a LON interface (FTT-10A) for transmissions over twisted pair cab-ling is available. An outstanding feature of the LON technology is its interoperability which guarantees that the BMS remains operationalbeyond the service-life of its individual components. CALEC® ST is the first energy calculator to be certified according to LONMARK® 3.4. Thismeans lower costs and reduced delivery date risks for system integration. LONMARK® 3.4 certification means, among other things:• Assurance of communication functionality and data availability• Low integration costs since standard tools can be used and all features required by LONMARK® are available (object library, XIF files, ser-vice LED, service key, etc.).Modbus RTU interfaceThe Modbus interface allows direct connection of CALEC® ST to a Modbus controller. The Modbus protocol as de facto standard in controland building management systems is widely used since it is an open protocol (www.modbus.org). It is based on a master/slave architec-ture and allows for a simple system integration by means of a mapping table. Modbus RTU uses the physical layer of the RS485 interface.Further information can be found in the operating instructions (Art. No. 20891).N2Open interfaceCALEC® ST can communicate directly with N2Open controllers (e. g. from the JCI company ) by means of the N2Open interface. N2Openalso uses the physical layer of the RS485 interface. Further information can be found in the operating instructions (Art. No. 20892).Limit signal,Alarm signal,Power,Flowrate M-Bus Master for remote readingM-Bus #1M-Bus #2 M-Bus Masterfor BMS5Digital inputs and outputsThe CALEC® ST can be fitted with two digital-signal interfaces, which can be configured - by means of a switch - as either inputs or out-puts. These signals can be used to process counter impulses, or to warn when limit values have been exceeded, or to transmit alarm mes-sages to the building-management system.Limit-value signalsDigital output signals can be used to emit limit-value monitoring signals. The following parameters can be monitored in this respect:1. Function of one-sided limit-value monitoring (Limit1)If an adjustable maximum limit is exceeded or if the reading fails to reach an adjustable minimum, the output signal switches over, hy-steresis (0 - 10 %) and control direction are selectable as required. While the excess-reading remains in force, the meter (showing “Cnt”for “counter”) calculates the total duration of the error for inspection purposes.2. Function of two-sided limit-value monitoring (Limit2)If an adjustable maximum limit is exceeded and if there is failure to reach an adjustable minimum, the functions operate in a similar wayto those of Limit1.Alarm messageThe microprocessor monitors the temperature sensor and internal functions, and displays any resulting error messages. This informationcan also be used to generate an alarm signal via the digital outputs.Analogue outputsCALEC® ST can be equipped with two passive analogue outputs. An external power supply is required for operating purposes. The outputsare electrically isolated from each other and from the counter mechanism. The current per channel can be adjusted within a range of 0 -20 mA or 4 - 20 mA. The following readings can be emitted as current signals:Additional functionsCrucial-date factorsTwo freely-programmable crucial dates (e.g. March 31st and September 30th) can be entered into the metering system and checked atany time.Factor DisplayTemperature on “hot” side t-hotTemperature on “cold” side t-coldTemperature difference t-diffOutput POUErFlow rate FLOUC-factor C-FactorDensity dEnSitYReading DisplayTemperature on “hot” side t-hotTemperature on “cold” side t-coldTemperature difference t-diffOutput POUErFlow rate FLOUC-factor C-FactorDensity dEnSitY6Data loggingThe CALEC® ST can periodically save up to 60 data records in a circular buffer.Simultaneous readoutIn a plant with many meters, a considerable time difference between readings can occur if these are read out sequentially. CALEC® STavoids this problem with the ”Freeze“ command. A broadcast command instructs all meters simulateneously to store the required value af-ter which they can be read out sequentially.Low-flow OFF functionThe system is factory-adjusted to carry out an energy calculation as soon as a temperature difference of >0 (when measuring heat) or <0(when measuring cold) is detected. If, for example, a circulation conduit carries, over a long period of time, large quantities of heat transfermedium with a very low temperature difference, this can lead to significant reading errors in temperature measurement. The so-called “low-flow OFF function” can be activated to avoid this, ensuring that energy is only detected when a pre-defined temperature difference is ex-ceeded.Special functionsEnergy metering in heating/cooling systemsThe “bi-directional energy metering” (BDE) option allows emit-ted energy to be metered even in twin-conduit networks thatperform a combined heating and cooling function. The measu-rement readings for heating and cooling are recorded separa-tely for their corresponding cost-calculation purposes.Recording of "heat return"The "Tarif Return Limit" (TGR) option can be used to set a programmable limit for the return temperature of the heat quantity. If this limit isthen exceeded, the flow is "returned" to the supply network and thus reduces efficiency.Heat carriers with frost protection additivesThe below-freezing temperatures involved in running a refrigeration plant require the use of additional frost protection. This poses an in-surmountable problem for many conventional heat meters, as has been investigated in detail in such publications as PTB Report PTB-ThEx-24 of June 2002.The “Glycol-based heat transfer medium” option available with CALEC® ST ensures that metering is accurate even in these situations, asenergy and volume can be calculated with a sliding scale of values for density and heating capacity for each temperature, independentlyof that temperature. CALEC® ST gives accurately polynomial readings for the physical characteristics of 11 widely-used heat transfer li-quids with respect to concentration and temperature (see following table).Factor DisplayDate -Energy TotalVolume TotalAuxiliary meter 1 TotalAuxiliary meter 2 TotalOutput Peak valueDowntimes Total1 60...2> >>>86420-2-4-6-8HeatingCooling1 2 3 4energy consumption5 6 7 8 9 10 11 12monthE+, V+E-, V-7Only the heat transfer medium and concentration are established at start-up (see table):1) Minimum temperature depends on concentration -40...0 °C2) Ethylene glycol-based3) Propylene glycol-based4) The above designations are the registered trademarks of their respective manufacturers.The following graphs give an example of how the dependency of temperature on specific heat and density can have an important bearingon the final calculation.Solar-powered thermal systemsSolar thermal systems likewise pose demanding tasks for energy metering with respect to temperature range and heat transfer me-dium.The “Glycol-based heat transfer medium” (GLY) option availa-ble with CALEC® ST also offers an excellent solution in these ca-ses (further details in the section on refrigeration systems).Medium 4) Display Concentration Temperature Manufacturer Type Application/observationsrangeAntifrogen N AntifroN 20 - 60 % -120 °C 1) Clariant E 2) Confirms to DIN 4757-1; toxicity class 4For cooling, solar, heating and heat pump systemsLow viscosity, requires lowerAntifrogen L AntifroL 20 - 60 % -120 °C 1) Clariant P 3) Not harmful to healthFor pharma-sector, food useTyfocor Tyfocor 20 - 60 % -120 °C 1) Tyfocor E See type ETyfocor-L TyfocorL 20 - 60 % -120 °C 1) Chemie P See type PDowCal 10 DOUCAL10 30 - 70 % -120 °C 1) Dow E See type EDowCal 20 DOUCAL20 30 - 70 % -120 °C 1) Dow E See type EGlythermin P44 GLYTHP44 40 - 80 % -100 °C 1) BASF P FDA-approved in USA, corrosionprotection less effectiveFor pharma-sector and food-production plantsTemper -10 TEMPER10 100 % fixed -10...150 °C Temper S Ready-to-use saline solutionTemper -20 TEMPER20 100 % fixed -20...150 °C Temper S Not harmful to health, (also for pharma and food sectors)Biodegradable, water-protection class 1Temper -30 TEMPER30 100 % fixed -30...150 °C Temper S Low viscosityTemper -40 TEMPER40 100 % fixed -40...150 °C Temper S High heat-transfer capacitySolar panelPumpBoilerPumpSolar tankCustomercoldthottTemperature (°C)(kJ/kg.K)Temperature (°C)Density (g/cm3)DOWCAL is a registered trademark of the Dow Chemical CompanyCALEC® ST FlowThe CALEC® ST Flow configuration is designed for flow-rate measurement purposes. Temperature measurement (“hot” and “cold” side) isdisabled in this configuration, i.e. no temperatures are detected or displayed. CALEC® ST Flow uses the accumulated pulse signals fromthe flow detector to calculate the current flow-rate reading. These measurement readings can be sent to the display, the analogue outputsand/or the M-Bus or LON interface for reading or further processing.CALEC® ST configurationsAvailable CALEC® ST configuration variants in accordance with our country-specific price lists.OperationThanks to their logically-structured functioning, all setting adjustments on the CALEC® ST can be carried out locally and without the use ofadditional equipment.Multi-function displayThe multi-function display shows the eight-digit meter reading, along with symbols and short texts for user operation purposes.The displays can be selected using two buttons during operation or when the housing is closed:Operating buttonsUnder the cover, and thus protected by the lead seal, is the Service but-ton, which allows additional service information to be displayed and ad-justments to be carried out.Service buttonProfessional installers have the PC software CALEC® Win K at their disposal (available for download from our website), which provides ef-fective support for initial start-up, data analysis and order specifications.Flow indicationMemoryAlarm indicationPlaces after the decimal point8 character decimal fieldEdit modeService modeUser modeUnitsIdentification8The following graph shows the information available at various points on the main operating flowchart, along with the short text designa-tions of various sub-functions:9Display: Description:Info: Error message displayInstAnt: Current readings for temperature, output, flow rate, C-factor, densityTime: Date and timeStich: Critical-date valuesLoGGer: Data-log memory settingsInPuts: Settings and status of signal inputsOutPuts: Settings and status of signal outputsUnitS: Measurement-unit settingsBUS: M-Bus settingsCONFIG: Further settings (e.g. for glycol-based heat transfer medium)SYStem: System data (e.g. firmware version)H2 12345 . 678 m3*H3 12345 . 678 m3*ImP 100 L *Sid coldINFOSegmenttestH2 12 . 345678 m3 *inStAnt tIME Stich LOGGEr InPutS OutPutS UnitS BUS6 CONFIG SYStEM 2 3 4 5 7 8 910 11 1CALEC® ST BDE: V- E- V+ E+ CALEC® ST FLOW: H1 Installation side12H3 12 . 345678 m3 *12EditEditE 12345 678 kWh* E 12345.678 kWh* 12 Edit Prog V 12345 678 m3* V 12345 .678 m3* 12 Edit Prog M 12345 678 t* M 12345 .678 t* 12 Edit Prog CALEC® ST Masse 0 T1 12345678 kWhT2 12345678 kWhCALEC® ST TGR:10Plug-in calculator moduleThe energy calculator is housed in a plug-in module. The bottom of the housing (which contains the field wiring) does not have to be re-moved when recalibrating the unit. Furthermore, device-specific data are retained in the configuration memory (EEPROM) in the bottom ofthe housing (except parameters that are subject to calibration, like impulse value and installation side).Housing, dimensionsHousingLower section with connection terminals, computer module and coverInstallationDIN-standard rail or three-point attachment directly to the wallElectrical connectionsThe wiring layout used depends on device configuration and applicable options. The factory-configured state of the unit is shown on the di-agram attached to the inside of the housing cover.Battery-powered version Mains-powered version (with M-Bus and low-voltage supply)(Example) (Example)11Approval permitsEuropean approval according to the Measurement Instruments Directive (MID) 2004/22/EG, CH-MI004-07001-00Pattern approval 22.75/08.02 as cooling meter according to PTB K7.2 Technical data and standardsThe following tables contain information on standards and technical data on the available functions. For possible combinations of func-tions refer to the price list.Housing and operating conditionsDimensions B x H x T = 120 x 163 x 49 mmAmbient temperature +5...+55 °C, EN 1434 class CStorage temperature 0...60 °COptical interface IEC 870-5, M-Bus protocolBattery-powered versionPower supply 3 V lithium battery, service life >6 years at ambient temperature of <45 °CCounter cycle 20 sMain pulse input High-resistance for contact or transistor output Impulse >8 ms, pause >80 ms, max. 10 HzWith symmetrical impulse signal, max. 6 HzMains versionPower supply 230 VAC ±10 % 50/60 Hz, <0,5 VA, 12 ... 24 VDC or 15 VACCalculating cycle 1 sBackup battery 3 V Li button cell, 48 mAhMain pulse input For NAMUR, contact or transistor pulse transmittersNAMUR: 8V / 1 kOhm, switching points: 1.5 mA, 2.1 mAPulse width >0.35 ms, pause >2.5 ms, max. 200 HzAdditional functionsAdjustable temperature difference cutoff Function to suppress energy calculation if the temperature differential is too little, (SMU) ?T SMU adjustable 0 to 2.99 KLimit-value monitoring Single- or two-sided, hysteresis 0 - 10MeasurementTemperature-measurement range 0...+183 °C, Type approval 5 °C ... 180 °C optional 2...180 °CTemperature difference 0...175 K, Type approval 3 K ... 175 K optional 2 K...178 KTemperature sensor Pt 100 or Pt 500 paired as per IEC751, with 2- or 4-wire connectionInstallation side “Hot” or “cold”Pulse value of flow sensor 0.001 to 9999.999 literPulse values and units for auxiliary inputs Volume: 0.001 to 9999.999 ml, l, m3, USGaland contact outputs Energy: 0.001 to 9999.999 kWh, MWh, kJ, GJ, kBtu, MBtuError limits Better than those required for counter mechanisms conforming to EN 1434-1Suitable for combined class-2 heat metering as per EN 1434-1 when used with suitable volume-metering elementsDisplayDisplay units, volume m3, USGalDisplay units, energy kWh, MWh, MJ, GJ, KBtu, MBtuData backup in event of power failure In EERPOM >10 yearsData memory 60 data records, tracing 1 x per month, every 2 days, daily(also hourly in mains-powered versionA0.5 - 02.2010 - Art. Nr. 11837Änderungen vorbehalten / Sous réserve de modificationsModification rights reserved / Copyright © Aquametro AGOptions for battery and mains versionsPulse input / output and relay outputsInputs / outputs 2 pulse inputs/outputs, selectable with switchesPulse inputs For connecting to a pulse transmitter with potental free contact or “open-collector“ Pulse width: =8 ms pause: =80 msFrequency:=10 Hz (symmetric pulses <6 Hz)Relay outputs Max.48 V / 100 mA (AC/DC), RON: <20 Ohm, ROFF: >10 M Ohm The relay outputs are galvanically isolated from themselves and from the calculating unit. Max. potential difference relay contact to device ground: 48 VDCM-Bus interfaceM-Bus interface According to EN 13757-2/-3Baud rate 300, 2400 BaudNumber of interfaces Two M-Bus interfaces can be used for communication with 2 M-Bus mastersRelay output Max.48 V / 100 mA (AC/DC)RON: <20 OROFF: >10 MOThe relay outputs are electrically isolated from each other and from the counter mechanism.Max. potential difference between relay contact and device earth (ground): 48 VDCLON interfaceType FTT-10A, free topology (two wire, twisted pair cable), certified to LONMARK® 3.4Interface power supply 230 VAC ±10 % 50/60 Hz, <0,5 VAor 12...42 VDC ±10 % or 12...24 VAC ±30 % 50/60 HzBaud rate 78 kBaudMax. bus cable length 500 m / 2700 m without / with terminating resistors, 64 nodes per segmentLow voltage power supply for flow sensorPower supply 24 VDC, max. 150 mAFlow sensor e. g. AMFLO® MAG SmartOptions for the battery version only2 pulse outputs2 transistor outputs max. 48 VDC 50 mAOptions fort he mains supply version only2 analogue outputsOutput signal 4...20 mA or 0...20 mAPower supply External, 6...24 VDC (passive analogue signals)Resolution 12 bitMax. converter error ±0.15 % full scale plus ±0.15 % of measured valueSecond M-Bus card Additional M-Bus interface (only with mains supply and analogue ouput cards)Modbus RTU interfacePhysical layer RS 485Baud rate 300, 2400, 9600, 19200, 38400Address range (slave) 1...247Function code 03: Read holding registerWebsite www.modbus.orgN2OpenPhysical layer RS 485Baud rate 9600DISTRIBUTOR: HEAD OFFICE:AQUAMETRO AG AQUAMETRO (S.E.A.) Pte Ltd Ringstrasse 75 No. 21 Bukit Batok Crescent #11-84CH-4106 Therwil The WCEGA TowerSingapore 658065Phone +41 61 725 11 22 Phone +65 6899 1980Fax +41 61 725 15 95 Fax +65 6899 2972info@aquametro.com jimmycheong@aquametro.com.sg www.aquametro.comMicronics Limited