Device description
Contents
1. 0 0 25 50 75 10 0 125 15 0 17 5 m 20 0 I Fig 11 Systematic temperature measuring error AT depending on the cable length Curves depending on the cable cross section A 1 Temperature measuring error for A 0 14 mm 2 Temperature measuring error for A 0 25 mm 3 Temperature measuring error for A 0 50 mm Measuring error valid for copper cable y 57 m Qmm Ta 25 C and Pt100 sensor 6 0 K 5 0 AT 40 3 0 2 0 1 0 0 0 1 02 03 04 05 06 07 08 0 9 m1 0 I Fig 12 Systematic temperature measuring error AT depending on the cable cross section A Measuring error valid for copper cable y 57 m QmnY Ta 25 C 5 m and Pt100 sensor 25 K IS yr 15 1 0 0 5 0 0 30 20 10 O 10 20 30 40 50 C 60 T gt Fig 13 Systematic temperature measuring error AT depending on the cable temperature Ta Measuring error valid for copper cable y 57 m Omm2 1 5 m 0 25 mm2 and Pt100 sensor ILT TEMP 2 RTD sysmik de 13 Measuring errors All diagrams show that the increase in cable resistance causes the measuring error A considerable improvement is made through the use of Pt1000 sensors Due to the 10 fold higher temper ature coefficient a a 0 385 Q K for Pt100 to a 3 85 Q K for Pt1000 the effect of the cable resistance on the measurement i2. 57558018 Connection of resistance thermometers in 3 wire technology In 3 wire technology the effect of the cable resistance on the measured result within the terminal is eliminated or minimized by multiple measuring of the temperature related voltage and corresponding calculations The quali ty of the results is almost as good as when using the 4 wire technology shown in Fig 8 However the 4 wire technology provides better results in environments subject to heavy noise Fig 9 12 sysmik de ILT TEMP 2 RTD Measuring errors 2 Wire technology g 2RTD as Q o Q dit O 57550013 2 wire technology is the most cost effective connection method The U and U cables are no longer needed Temperature related voltage is not directly measured at the sensor and therefore not falsified by the two cable resistances Ri Fig 10 The measuring errors that occur may lead to the entire measurement to become useless diagrams in Fig 11 to Fig 13 However these diagrams show at which points of the measurement system measures can be taken to minimize these errors Bild 10 Connection of resistance thermometers in 2 wire technology 10 2 Systematic errors during temperature measurement using 2 wire technology re 1 12 0 9 0 2 6 0 3 0 3 0 0
3. Upper limit 850 C 850 C 180 C Sensor type Pt acc to DIN Ro 10 Q to 3000 Q Pt acc to SAMA Ro 10 to 3000 Q Ni Ro 10 Q to 3000 Q Ni Ro 10 Q to 3000 Q Ni500 Viessmann reso Temperature sensors acc to DIN 180 C C C C acc to SAMA 4 KO Ro x 100 max 400 pe E Relative po tentiometer Linear re sistance measuring range ILT TEMP 2 RTD sysmik de 11 Measuring errors 10 Measuring errors 10 1 Systematic measuring errors during temperature measurement using re sistance thermometers When measuring temperatures using resistance thermometers systematic measuring errors are often the cause of incor rectly measured results There are three possibilities of connecting sensors 2 3 and 4 wire technology 4 Wire technology 4 wire technology is the most precise way of measuring see Fig 8 5755B012 Connection of resistance thermometers in 4 wire technology When using the 4 wire technology a constant current is sent through the sensor via cables I and I With the other two cables U and U the temperature related voltage is tapped and measured at the sensor The cable resistances do not influence the measurement Fig 8 3 Wire technology 2RTD
4. 0 37 K KTY84 6 2 Q K 0 27 x 0 81K x 0 27 0 81 K 0 22 0 65 K Linear resistance lonbis400n __ 40 10 x_ 400 ma x OQbsaka 20 13 x 25 04 All errors indicated as a percentage are related to the positive measuring range final value The maximum tolerances contain the theoretical maximum possible tolerances The data refers to nominal operation installation on horizontal mounting rail Us 24 V Please also observe the values for temperature drift and the tolerances under EMI influences Temperature response at 25 C to 55 C typical maximum 12 ppm C 45 ppm C Additional tolerances influenced by electromagnetic fields Type of Electromagnetic Inter Typical Deviation From the Criterion ference Measuring Range Final Value Electromagnetic fields field strength 10 V m according to lt 1 51 A EN 61000 4 3 IEC 61000 4 3 Conducted interference Class 3 test voltage 10 V according to lt 0 92 A EN 61000 4 6 IEC 61000 4 6 Fast transients burst Class 3 according to EN 61000 4 4 lt 0 24 A IEC 61000 4 4 2 3 4 wire technology 16 sysmik de ILT TEMP 2 RTD
5. and temperature response a Medium sensitivity to calculate the tolerance values x Additional error when the connection is made using 2 wire technology see Systematic errors during temperature measurement using 2 wire technology Typical measuring tolerances at 25 C 2 Wire technology 3 Wire technology 4 Wire technology relative absolute relative absolute relative absolute Temperature sensors 0 385 QIK 0 26 K x 3 85 OK 10 31 K x 0 617 Q K 6 17 OK Cu50 0 213 Q K 0 24 x 0 47 K x 0 24 0 47 K 0 18 0 35 K Ni1000 L G 5 6 O K 0 13 X 0 21K x 0 13 0 21 K 0 11 0 18 K Ni500 2 8 Q K 0 17 X 0 43K x 0 17 0 43 K 0 14 0 36 K Viessmann 10 7 0K Linear resistance 0 Q bis 400 Q 0 025 x 100 MQ x 0 025 100 mQ 0 019 0 0 bis 4 ka 120 x 20 025 ILT TEMP 2 RTD sysmik de 15 Tolerance and temperature response Maximum measuring tolerances at 25 C 2 Wire technology 3 Wire technology 4 Wire technology relative absolute relative absolute relative Temperature sensors 410 12 x 40 15 x 40 36 x Ni1000 6 17 O K 40 45 x 0 81K x 0 45 0 81K 0 36 0 65 K Cu50 0 213 O K 0 47 x 0 94K x 0 47 0 94 K_ 0 38 0 75 K Ni1000 L G 5 6 Q K 0 56 x 0 89K x 0 56 0 89 K_ 0 44 0 71 K Ni500 2 8 Q K 0 72 x Viessmann KTY81 110 10 7 Q K 0 31 x 0 47K x 0 31 0 47 K 0 25
6. part of this document may be reproduced or modified in any form without prior written agreement with SysMik GmbH Dresden Copyright 2014 by SysMik GmbH Dresden SysMik GmbH Dresden Tel 49 0 351 433 58 0 Bertolt Brecht Allee 24 Fax 49 0 351 4 33 58 29 01309 Dresden E Mail Sales sales sysmik de E Mail Support service sysmik de Germany Homepage www sysmik de 2 sysmik de ILT TEMP 2 RTD Contents Contents Device description 1 Contents 3 1 Description 4 2 Order information 4 3 Technical data 5 4 Local diagnostic and status indicators Terminal point assignment 7 5 Internal circuit diagram 8 6 Electrical isolation 8 7 Connection notes 9 8 Connection examples 10 9 Measuring ranges 11 9 1 Measuring Ranges Depending on the Resolution Format IB Standard 11 9 2 Input measuring values 11 10 Measuring errors 12 10 1 Systematic measuring errors during temperature measurement using resistance thermometers 12 10 2 Systematic errors during temperature measurement using 2 wire technology 13 11 Tolerance and temperature response 15 ILT TEMP 2 RTD sysmik de Description Order information 1 Description Note This device description is only valid in association with the IL SYS INST UM user manual or the Inline system manual of the specifically used bus system Make sure you always use the latest documentation it can be downloaded at www sysmik de The terminal is designed for use within
7. Inline terminal 2 resistive temperature sensor inputs ILT TEMP 2 RTD Device description Preliminary SYSIMIk GmbH Dresden Disclaimer Imprint This manual is intended to provide support for installation and usage of the device The information is be lieved to be accurate and reliable However SysMik GmbH Dresden assumes no responsibility for possi ble mistakes and deviations in the technical specifications SysMik GmbH Dresden reserves the right to make modifications in the interest of technical progress to improve our modules and software or to correct mistakes We are grateful to you for criticism and suggestions Further information device description available software can be found on our homepage www sysmik de Please ask for latest information SysMik disclaims all warranties in case of improper use or disassembly and software modifications not de scribed in this document or when using improper or faulty tools Commissioning and operation of the de vice by qualified personnel only All applicable regulations have to be observed SysMik and the SysMik logo are registered trademarks of SysMik GmbH Dresden IPOCS is trademark of SysMik GmbH Dresden Networking Together is subject to copyright of SysMik GmbH Dresden All other trademarks mentioned in this document are registered properties of their owners These and fur ther trademarks are used in this document but not marked for better readability No
8. an Inline station This terminal provides an two channel input module for resistive temperature sensors This terminal supports platinum and nickel sensors according to the DIN standard and the SAMA guideline In addition sensors Cu10 Cu50 Cu53 as well as KTY81 and KTY84 are supported The measuring temperature is represented by 16 bit values in two process data words one word per chan nel Features Two inputs for resistive temperature sensors Configuration of channels via the bus system Measured values can be represented in three different formats Connection of sensors in 2 3 and 4 wire technology 2 Order information Inline terminal with two resistive temperature ILT TEMP 2 RTD 1225 100519 01 9 1 sensor inputs complete with accessories con nector and labeling field 4 sysmik de ILT TEMP 2 RTD Technical data 3 Technical data General data 12 2 mm x 120 mm x 66 6 mm 46 g without connector 67 g with connector Process data mode with 2 words 2 3 and 4 wire technology 25 C to 55 C Ambient temperature storage transport 25 C to 85 C Permissible humidity operation storage transport 10 to 95 according to DIN EN 61131 2 Permissible air pressure opera 70 kPa to 106 kPa up to 3000 m above see level tion storage transport IP20 according to IEC 60529 Class of protection Class 3 according to EN 61131 2 IEC 61131 2 Connection data for Inline connectors Spring cage term
9. b us IN Uma 24 VDC ME Aand B Ground potential Analog inputs 5755A007 Fig 3 Electrical isolation of the individual function areas 8 sysmik de ILT TEMP 2 RTD Connection notes Connection notes Connection oft the resistance sensors gt In 4 wire technology a sensor can only be connected to channel 1 In this case the sensor can only be con nected to channel 2 using 2 wire technology Shield connection gt The Connection examples show how to connect the shield Connect the shielding to the Inline terminal using the shield connection clamp The clamp connects the shield directly to FE on the terminal side Additional wiring is not necessary Isolate the shield at the sensor Sensor connection in 4 wire technology Always connect temperature shunts using shielded twisted pair cables ILT TEMP 2 RTD sysmik de 9 Connection examples 8 Connection examples Connection of passive sensors 5755B004 A Channel 1 2 wire technology B Channel 2 3 wire technology Fig 4 Connection of sensors in 2 and 3 wire technology with shield connection Figure 4 and Figure 5 a 5755B011 A Channel 1 4 wire technology B Channel 2 2 wire technology Fig 5 Connection of sensors in 4 and 2 wire techno
10. g supply analog I O functional earth ground ground Error Messages to the Higher Level Control or Computer System Failure of the internal voltage supply Failure of or insufficient communications power UL Yes I O error message sent to the bus coupler 6 sysmik de ILT TEMP 2 RTD Diagnostic and status indicators Terminal point assignment 4 Local diagnostic and status indicators Terminal point assignment Functional identification green Local diagnostic and status indicators Color_ Meaning green Diagnostics Terminal point assignment for 2 3 wire termination point Wa RTD of sensor 1 42 e Constant current supply 1 3 Ur Measuring input of sensor 1 23 Us Measurng input of sensor 2 Ti RTD of sensor 2 Constant current supply Shield connection channel 1 and 2 Terminal point assignment for 4 wire termination on channel 1 and 2 wire termination on channel 2 Terminal PER n RTD of sensor 1 5755B002 Constant current supply Measuring input of sensor 1 pa Jue Measuring input of sensor 2 FE of sensor 2 i Constant current supply Shield connection channel 1 and 2 Fig 1 local diagnostic and status indicators and terminal point assignment Safety note WARNING During configuration ensure that no isolating voltage is specified between the analog inputs and the local bus During thermistor detection this for exam
11. inals Conductor cross section 0 2 mm to 1 5 mm solid or stranded AWG 24 16 Interface Local bus Data routing Power Consumption Communications power UL 7 5 V Current consumption at UL 43 mA typical 60 mA maximum I O supply voltage Uana 24 V DC Current consumption at Uana 11 mA typical 18 mA maximum Total power consumption 587 mW typical 882 mW maximum Supply of the Module Electronics and I O Through the Bus Coupler Power Terminal Connection method Potential routing Analog Inputs Two inputs for resistive temperature sensors 2 3 or 4 wire shielded sensor cable Pt Ni Cu KTY According to DIN according to SAMA 120 ys typical Depending on the connection method Both channels in 2 wire technology 20 ms One channel in 2 wire technology one channel in 4 20 ms wire technology Both channels in 3 wire technology 32 ms ILT TEMP 2 RTD sysmik de 5 Technical data Safety equipment none Electrical Isolation Common Potentials 24 V main voltage Um 24 V segment voltage Us and GND have the same potential FE is a separate potential area Separate Potentials in the Terminal Test Distance Test Distance 7 5 V supply bus logic 24 V analog supply ana O 7 5 V supply bus logic 24 V analog supply ana log I O 7 5 V supply bus logic functional earth ground bus logic functional earth ground 24 V analog supply analog I O functional earth 24 V analo
12. logy with shield connection When connecting the shield at the terminal you must insulate the shield on the sensor side shown in gray in Use a connector with shield connection when installing the sensors Figure 4 shows the connection schemati cally without shield connector Connection of a potentiometer 1 Connection and direct evaluation of a 2 kQ potentiometer at channel 1 in 2 wire technology 5755A020 Fig 6 Connection of a potentiometers at channel 1 in 2 wire technology with shield connection 2 Connection and direct evaluation of a 2 kQ potentiometer at channel 1 in 3 wire technology N oO o Oo Oo So Qoo Connection of a potentiometers at channel 1 in 3 wire technology with shield connection Fig 7 10 sysmik de ILT TEMP 2 RTD Measuring ranges 9 Measuring ranges 9 1 Measuring Ranges Depending on the Resolution Format IB Standard Resolution Temperature sensors Temperature values can be converted from C to F accord Bit 7 and 6 ing to the following formula 00 273 C up to 3276 8 C T PFI T PC x 2 32 resolution 0 1 C 5 273 C up to 327 68 C Where resolution 0 01 C T F Temperature in F 10 459 F up to 3276 8 F T C Temperature in C resolution ung 0 1 F 11 459 F up to 327 68 F resolution 0 01 F Measuring range Software supported Lower limit
13. ple means that the user has to provide signals with safe isolation if applicable Installation instruction High current flowing through potential jumpers Um and Us leads to a temperature rise in the potential jumpers and inside the terminal To keep the current flowing through the potential jumpers of the analog terminals as low as possible always place the analog terminals after all the other terminals at the end of the main circuit sequence of the Inline terminals see also IL SYS INST UM E user manual or the Inline system manual for your bus system ILT TEMP 2 RTD sysmik de 7 Circuit diagram Electrical isolation 5 Internal circuit diagram Key Local bus m Protocol chip Un Y Optocoupler uP Mikroprocessor with multiplexer and TA analog digital converter TEPRON Electrically erasable programmable read only memory Y DC DC converter with electrical isolation REF Reference voltage gt Amplifier 24 V Ug 24 V Uy L A Fig 2 Internal wiring oft terminal points 5755B003 Note Other symbols used are explained in the IL SYS INST UM E user manual or in the Inline system manual for your bus system 6 Electrical isolation 1 E Bus interface mu Local b us OUT uN OPC E U 7 5V DC ME LV 00 4 4 E U 24VDO 1 0 interf peas ace 5V micr Oprocessor Electr ical isolation between area Local
14. s decreased by factor 10 All errors in the diagrams above would be reduced by fac tor 10 Diagram 1 clearly shows the effect of the cable length on the cable resistance and therefore on the measur ing error The solution is to use the shortest possible sensor cables Diagram 2 shows the influence of the cable diameter on the cable resistance lt can be seen that cables with a cross section of less than 0 5 mm cause errors to increase exponentially Diagram 3 shows the effect of the ambient temperature on the cable resistance This parameter does not play a great role and can hardly be influenced but it is mentioned here for the sake of completeness The formula to calculate the cable resistance is as Where follows RL Cable resistance in Q 1 R Ra X 1 0 0043 xT R120 Cable resistance at 20 C in Q K Cable length in m 1 x 1 0 0043 x T xx K x Specific electrical resistance of cop perin Qmm 7 m A Cable cross section in mm 0 0043 1 K Temperature coefficient for Kupfer Ta Ambient temperature cable temper ature in C Since there are two cable resistances in the measuring system forward and return the value must be doubled The absolute measuring error in Kelvin K is provided for platinum sensors according to DIN using the av erage temperature coefficient a a 0 385 O K for Pt100 a 3 85 Q K for Pt1000 14 sysmik de ILT TEMP 2 RTD Tolerance and temperature response 11 Tolerance
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