CALEC® ST Multi-protocol heating and cooling energy calculator
Contents
1. Two M Bus interfaces can be used for communication with 2 M Bus masters Relay output Max 48 V 100 mA AC DC RON lt 20 Q ROFF gt 10 MQ The relay outputs are electrically isolated from each other and from the counter mechanism Max potential difference between relay contact and device earth ground 48 VDC LON interface Type FTT 10A free topology two wire twisted pair cable certified to LonMark 3 4 Interface power supply 230 VAC 10 50 60 Hz lt 0 5 VA or 12 42 VDC 10 or 12 24 VAC 30 50 60 Hz Baud rate 78 kBaud Max bus cable length 500 m 2700 m without with terminating resistors 64 nodes per segment Options for the battery version only 2 pulse outputs 2 transistor outputs max 48 VDC 50 mA Options fort he mains supply version only 2 analogue outputs Output signal 4 20 mA or 0 20 mA Power supply External 6 24 VDC passive analogue signals Resolution 12 bit Max converter error 0 15 full scale plus 0 15 of measured value Second M Bus card Additional M Bus interface only with mains supply and analogue ouput cards Low voltage power supply for flow sensor Power supply 24 VDC max 150 mA Flow sensor e g AMFLO MAG Smart Modbus RTU interface Physical layer RS 485 Baud rate 300 2400 9600 19200 38400 Address range slave 1 247 Function code 03 Read holding register Website www modbus org N20pen Physical layer RS 485 Baud rate 9600 BACnet MS TP Phys2. for many conventional heat meters as has been investigated in detail in such publications as PTB Report P TB 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 as energy and volume can be calculated with a sliding scale of values for density and heating capacity for each temperature independently of 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 6 Only the heat transfer medium and concentration are established at start up see table Medium 4 Antifrogen N Antifrogen L Tyfocor Tyfocor L DowCal 10 DowCal 20 Glythermin P44 Temper 10 Temper 20 Temper 30 Temper 40 Display AntifroN AntifroL Tyfocor TyfocorL DOUCAL10 DOUCAL20 GLYTHP44 TEMPER10 TEMPER20 TEMPER30 TEMPER40 Concentration 20 60 20 60 20 60 20 60 30 70 30 70 40 80 100 fixed 100 fixed 100 fixed 100 fixed 1 Minimum temperature depends on concentration 40 0 C 2 Ethylene glycol based 3 Propylene glycol based 4 Temperature range 120 C 120 C 120 C 120 C 120 C 120 C 100 C 10 1 0G 220 100 C sa lOG 40 150 C The above designations are the registered tra
3. 0 Approval permits European approval according to the Measurement Instruments Directive MID 2004 22 EG CH MI004 07001 00 Pattern approval 22 75 08 02 as cooling meter according to PTB K7 2 Technical data and standards The 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 conditions Dimensions BxHxT 120 x 163 x 49 mm Ambient temperature 5 55 C EN 1434 class C otorage temperature 0 60 C Optical interface IEC 870 5 M Bus protocol Measurement Temperature measurement range Lal G Temperature difference 3 K 177 K Temperature sensor Pt 100 or Pt 500 paired as per IEC 751 with 2 or 4 wire connection nstallation side Hot or cold Pulse value of flow sensor 0 001 to 9999 999 liter Pulse values and units for auxiliary inputs Volume 0 001 to 9999 999 ml m USGal and contact outputs Energy 0 001 to 9999 999 kWh MWh kJ GJ kBtu MBtu Error limits Better than those required for counter mechanisms conforming to EN 1434 1 suitable for combined class 2 heat metering as per EN 1434 1 when used with suitable volume metering elements Display Display units volume m USGal Data memory 60 data records tracing 1 x per month every 2 days daily also hourly in mains powered version Additional functions Adjustable temperature difference cutoff Function to suppress en
4. VD 3 180 e 10 2011 aqua etro CALEC ST Multi protocol heating and cooling energy calculator Application Top quality heat and cooling meters for heating air conditioning cooling and solar energy plants can be realised with the CALEC ST energy calculator The modular unit distinguishes itself by its long term stability Flexible communications makes it particularly interesting for integration into building management systems Characteristics Customer advantages e Interfaces for building control systems e Precise energy measurement for all thermal M Bus LON Modbus N2Open and BACnet MS TP applications in buildings engineering e Metrological approval in accordance with e Used in cooling and solar heating systems 2004 22 EC MID and PTB K7 2 cold heat cold e Modular extendable combined Application The CALEC ST is used for energy metering in split configuration with passive impulse generating volume measuring elements and P t100 or Pt 500 temperature sensors in two or four wire version In most cases CALEC ST is used with the following volume measuring ele ments e Multibeam meters in the range Qp 06 10 m h e Hydrometric vane in the range Qp 15 600 m h e Static volume measuring elements up to Qp 0 6 67000 m h Choose 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 approval In most countries en
5. andardisation EN 13757 and features as readout bus f reo for building management sytems BMS M Bus has been used as the communication protocol in many instances Advantages include M Bus 2 e easy installation e high cost effectiveness e multi vendor capability Limit signal Alarm signal Power Flowrate Not only standard data such as meter readings and current values can be read out over the M Bus interface but also all additional data available from the device for example billing and logger values With CALEC ST prrimary 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 with only 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 interface A 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 operational beyond the service life of its individual components CALEC ST is
6. be used to generate an alarm signal via the digital outputs Analogue outputs CALEC ST can be equipped with two passive analogue outputs An external power supply is required for operating purposes The outputs are electrically isolated from each other and from the counter mechanism The current per channel can be adjusted within a range of O 20 mA or 4 20 mA The following readings can be emitted as current signals Reading Display Temperature on hot side t hot Temperature on cold side t cold Temperature difference t diff utput POUEr Flow rate FLOU C factor C Factor Density dEnSitY Temperature on cold side t cold Temperature difference tiff Additional functions Crucial date factors Two freely programmable crucial dates e g March 31st and September 30th can be entered into the metering system and checked at any time g Data logging The CALEC ST can periodically save up to 60 data records in a circular buffer Auxiliary meter 1 Total Auxiliary meter 2 Total Output Peak value Downtimes Total Simultaneous readout In a plant with many meters a considerable time difference between readings can occur if these are read out sequentially CALEC ST avoids 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 function The system is factory adjusted to car
7. d volu me flow of the heat transfer medium P Volume rate of flow x T heat side T cold side x k T heat side For heating flow temperature for cooling return temperature T cold side For heating return temperature for cooling flow temperature k 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 the heat 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 e The static accuracy and stability of the temperature measuring procedure e The counter cycle of the temperature measurement system and the volume flow used to detect dynamic factors CALEC ST is ideally equipped for use in demanding metering tasks thanks to e 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 e Short counter cycle mains version 1 s e The ability to use high resolution mechanical or electronic flow indicators operating at pulse frequencies of up to 200 Hz mains version Flow rate measurement The system is compatible with all standard flow meters that work on the pulse output principle Adjust the pulse value t
8. demarks of their respective manufacturers Manufacturer Type Application observations Clariant Eo Confirms to DIN 4757 1 toxicity class 4 For cooling solar heating and heat pump systems Low viscosity requires lower Clariant P Not harmful to health For pharma sector food use Tyfocor See type E Chemie See type P See type E See type E FDA approved in USA corrosion protection less effective For pharma sector and food production plants Ready to use saline solution Not harmful to health also for pharma and food sectors Biodegradable water protection class 1 Low viscosity High heat transfer capacity The following graphs give an example of how the dependency of temperature on specific heat and density can have an important bearing on the final calculation ah Mw 40 i i Temperature C DOWCAL is a registered trademark of the Dow Chemical Company Solar powered thermal systems Solar tank Customer 4 Solar panel kJ kg K Temperature CC Solar 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 CALEC ST Flow The CALEC ST Flow configuration is designed for flow rate measure
9. ergy calculation if the temperature differential is too little SMU AT SMU adjustable 0 to 2 99 K Limit value monitoring Single or two sided hysteresis O 10 Battery powered version Power supply 3 V lithium battery service life gt 6 years at ambient temperature of lt 45 C Counter cycle 20S Main pulse input High resistance for contact or transistor output Impulse gt 8 ms pause gt 80 ms max 10 Hz With symmetrical impulse signal max 6 Hz Mains version Power supply 230 VAC 10 50 60 Hz lt 0 5 VA 12 24 VDC or 15 VAC Calculating cycle 1s Backup battery 3 V Li button cell 48 mAh Main pulse input For NAMUR contact or transistor pulse transmitters NAMUR 8V 1 kOhm switching points 1 5 mA 2 1 mA Pulse width gt 0 35 ms pause gt 2 5 ms max 200 Hz 11 Options for battery and mains versions Pulse input output and relay outputs Inputs outputs 2 pulse inputs outputs selectable with switches Pulse inputs For connecting to a pulse transmitter with potental free contact or open collector Pulse width 8 ms pause 80 ms Frequency lt 10 Hz symmetric pulses lt 6 Hz Relay outputs Max 48 V 100 mA AC DC RON lt 20 Ohm ROFF gt 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 VDC M Bus interface M Bus interface According to EN 13757 2 3 Baud rate 300 2400 Baud Number of interfaces
10. ergy metering systems used for commercial purposes are subject to compulsory verification The devices comprising the 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 with this 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 principle A so called combined heat meter requires the following individual devices Electronic energy calculating device TE lt Sy Temperature sensors installed in the supply and return pipelines Pi r f Return gt oF Flow sensor with pulse generator 2 The thermal output P of a pipe conduit network is based on a measurement of the flow temperature return flow temperature an
11. ical layer RS 485 Baud rate 9600 19200 38400 oder 76800 SALES PARTNER HEAD OFFICE a ua AQUAMETRO AG metro Ringstrasse 75 _ nN CH 4106 Therwil Phone 41 61 725 11 22 Fax 41 617251595 info aquametro com www aquametro com Anderungen vorbehalten Sous r serve de modifications Modification rights reserved Copyright Aquametro AG A0 3 10 2011 Art Nr 11837
12. ment purposes Temperature measurement hot and cold side is disabled in this configuration i e no temperatures are detected or displayed CALEC ST Flow uses the accumulated pulse signals from the flow detector to calculate the current flow rate reading These measurement readings can be sent to the display the analogue outputs and or the M Bus or LON interface for reading or further processing CALEC ST configurations Available CALEC ST configuration variants in accordance with our country specific price lists Operation Thanks to their logically structured functioning all setting adjustments on the CALEC ST can be carried out locally and without the use of additional equipment Multi function display Places after the Paan D pot Service mode The multi function display shows the eight digit meter reading along with Flow indication Alarm indication Edit mode User mode symbols and short texts for user operation purposes Memory oe LowBatt Alarm d Bi aa A A A A a T VIRI CREA AUN IU PATI mlam Identification 8 character decimal field Units Saet The displays can be selected using two buttons during operation or se AT Canin when the housing is closed 2820000084288 Operating buttons Under 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 button P
13. n calculator module The 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 of the housing except parameters that are subject to calibration like impulse value and installation side Housing dimensions Housing Lower section with connection terminals computer module and cover Installation DIN standard rail or three point attachment directly to the wall 120 0 m 48 5 36 a Meve CALEC ST W rmez hler Heat Meter Compteur de Chaleur T Q TT S i k 163 0 126 3 O O N Electrical connections The 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 HAE tg a flB our A CEEA To tiL 314 els 112 6 t OUT 1 OUT 2 4 2 eA 2 o Go i wn e tt tipttew ie cL U 2 a AE w 100101102103 o 3 fi a 5 230V eel as 2 i L N i IN2 IN3 A O 1
14. o 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 measurement The CALEC ST is fitted with two highly accurate temperature measurement inputs which are each connected to type approved paired temperature sensors in two or four wire configuration The planning of systems should conform to heat meter standard EN 1434 parts 2 and 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 solution for air conditioning or cooling installation when used with appropriate temperature sensors and flow meters for cooling 3 Data communication M Bus Interface On account of its st
15. rofessional 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 8 The 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 O Edit CALEC ST BDE Prog 12 gt 2 5 ee gt OD 2 Edit V 12345 678 m3 9 2 cuostnoe I ele o gt H1 V 12345 678 m3 Cw CALEC ST Masse LOGGEr E Edit lt D Qe ws FO M 12345 678 t oD CALEC ST TGR T1 12345678 kWh oD 4 as D D 2 Sem A corre o gt d Qe H2 12 345678 m3 SYSTEM O D Edi H3 12345 678 m3 G Fait QG H3 12 345678 m3 f ImP 100 L Sid said Installation side LowBatt Alarm PES ep eee Edit 2 im ANA T Hi IH Ale DTA DA TANI VAN VAN EA MR pal pal JAN Display Description Info Error message display InstAnt Current readings for temperature output flow rate C factor density Time Date and time Stich Critical date values LoGGer Data log memory settings InPuts settings and status of signal inputs OutPuts settings and status of signal outputs Units Measurement unit settings BUS M Bus settings CONFIG Further settings e g for glycol based heat transfer medium SYStem System data e g firmware version 9 Plug i
16. ry out an energy calculation as soon as a temperature difference of gt 0 when measuring heat or lt 0 when measuring cold is detected If for example a circulation conduit carries over a long period of time large quantities of heat transfer medium 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 functions s Energy metering in heating cooling systems 6 The bi directional energy metering BDE option allows emit 6 ji Ei Heating ted energy to be metered even in twin conduit networks that iS Ei Cooling perform a combined heating and cooling function The measu 3 rement readings for heating and cooling are recorded separa S o tely for their corresponding cost calculation purposes O D 2 e 4 1 2 3 4 5 6 7 8 9 10 11 12 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 is then exceeded the flow is returned to the supply network and thus reduces efficiency Heat carriers with frost protection additives The below freezing temperatures involved in running a refrigeration plant require the use of additional frost protection This poses an in surmountable problem
17. s and outputs The 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 signals Digital output signals can be used to emit limit value monitoring signals The following parameters can be monitored in this respect Factor Display Temperature on hot side t hot Temperature on cold side t cold Temperature difference t diff utput POUEr low rate FLOU C factor C Factor Density dEnSitY 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 way to those of Limit1 Alarm message The microprocessor monitors the temperature sensor and internal functions and displays any resulting error messages This information can also
18. the first energy calculator to be certified according to LonMark 3 4 This means lower costs and reduced delivery date risks for system integration LonMark 3 4 certification means among other things e Assurance of communication functionality and data availability e 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 interface The Modbus interface allows direct connection of CALEC ST to a Modbus controller The Modbus protocol as de facto standard in control and 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 interface CALEC ST can communicate directly with N2Open controllers e g from the JCI company by means of the N2Open interface N2Open also uses the physical layer of the RS485 interface Further information can be found in the operating instructions Art No 20892 BACnet MS TP interface With the BACnet interface the CALEC ST data can be transferred into a BACnet based network The physical layer is RS485 Additional information s available in the user manual Art No 94654 4 Digital input
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