National Instruments SCC-TC Series Thermocouple Input Modules User's Manual
Contents
1. 1 Pini 2 Pin2 3 PWB Key 4 Pin19 5 Pin 20 Figure 4 SCC Module Bottom View National Instruments Corporation 15 SCC TC Series Thermocouple Input Modules User Guide Table 1 lists the signal connection corresponding to each pin AI X and AI X 8 are the analog input signal channels of the E M Series DAQ device AI GND is the analog input ground signal and is the reference for AI X and AI X 8 A GND is the reference for the 15 V supplies and REF 5V AI GND and A GND connect to the SC 2345 2350 at the SCC PWR connector Table 1 SCC Module Pin Signal Connections for SCC TCOX Modules Pin Number Signal 1 Al X 2 3 4 AI X 8 5 2 6 DAQ Device AI GND pi za 8 9 10 11 A GND 12 REF 5 V 13 15 V 14 15 V 15 16 17 18 19 20 National Instruments NI ni com and LabVIEW are trademarks of National Instruments Corporation Refer to the Terms of Use section on ni com lega1 for more information about National Instruments trademarks Other product and company names mentioned herein are trademarks or trade names of their respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents 2002 2006 National Instruments Corporation All rights reserved 371074C 01 Jul062. 7x 25V L i l LA oa TOTH l eia oes i i gooh 10 uF 0 1 uF 7 at 25 C 1 16V 5 a i 9 S 25kQ ae ni Figure 1 SCC TCOX Signal Connections For more information about how to configure the SCC TCOX module using NI DAQmx refer to the SCC Quick Start Guide Using the TCOX Scaling Voltage Measurements 3 Note NI DAQmx includes thermocouple and thermistor conversion utilities that implement the conversions required in steps 3 and 5 of the following procedure Refer to your software documentation for more information on these utilities Your software environment may return only voltage measurements from E M Series DAQ devices If so you must convert voltage measurements to National Instruments Corporation 5 SCC TC Series Thermocouple Input Modules User Guide temperature measurements To make this conversion complete the following steps 1 Measure the thermocouple voltage a Read the thermocouple channel on the E M Series DAQ device Veseries CH X b Calculate the thermocouple voltage by using the following formula y V ESERIES re 100 where Vrc is thermocouple voltage Vesrries 1S E M Series DAQ device voltage This step provides proper scaling for the thermocouple amplifier in the SCC TCOX 2 Measure the reference junction cold junction temperature a Read the thermistor voltage AI X 8 b Convert the thermistor voltage to cold junction temperature using the formula in t
3. 93 cm 3 12 in gt E Lg 3 55 cm E 1 4 in Figure 3 SCC TC02 Dimensions Weight DCO savas eet ete Glee 25 g 0 9 oz WCO 02 sh tonite pain 22 g 0 8 oz Screw terminal wire gauge 24 to 12 AWG WO srecesceetiasten eres indexes nein ad eet One 20 pin right angle male connector 3 pin screw terminal system SCC TC02 two prong mini connector SCC TCO1 Screw terminal field wiring gauge SCC TCO02 oo eeeeeeeeees 28 to 16 AWG Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Each input must remain within 12 V of chassis ground Measurement Category I National Instruments Corporation 13 SCC TC Series Thermocouple Input Modules User Guide Environmental Operating temperature 0 ee 0 to 50 C Storage temperature eee 20 to 70 C TAUMMUGICY os Si sevsceesteeteth iecnweeivts sett 10 to 90 RH noncondensing Maximum altitude 2 000 m Pollution Degree indoor use only 2 Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL61010 1 CAN CSA C22 2 No 61010 1 3 Note For UL and other safety certifications refer to the product label or visit ni com certification search by model number or product line and click the appropriate link in the Certification column Electromagne
4. the desired channel and gain on the E M Series DAQ device 2 Short the inputs on the SCC TCOX screw terminals or miniplug 3 While acquiring data on the selected channel use a screwdriver to adjust the potentiometer protruding through the top of the module until you read 0 VDC Calibrating the SCC TCOX Using a Thermocouple Calibrator To calibrate the system using a thermocouple calibrator complete the following steps 1 National Instruments Corporation Make sure that the thermocouple connections at both the SCC and the thermocouple calibrator are at the same temperature Connect the thermocouple calibrator to the SCC TCOX For best results use thermocouple wire of the same length and type that you use in the thermocouple Set the thermocouple calibrator to the required calibration temperature Measure the calibrator voltage using the SCC TCOX Convert the measured calibrator voltage to a temperature measurement as described in the Scaling Voltage Measurements section Adjust the potentiometer on the top of the SCC TCOX so that the measured temperature is equal to the calibration temperature 9 SCC TC Series Thermocouple Input Modules User Guide Specifications These specifications are typical at 25 C Analog Input Number of input channels Input signals Input signal range ossee Input impedance Bandwidth Amplifier Characteristics Open thermocouple detection current Common mode rej
5. A USER GUIDE SCC TC Series Thermocouple Input Modules The SCC TC Series thermocouple input modules SCC TC01 and SCC TC02 accept input signals from B E J K N R S and T type thermocouples Each module contains thermistor circuitry powered by 2 5 V to compensate for cold junction effects and can detect open thermocouple circuits Each module has one thermocouple input channel which consists of a gain of 100 differential amplifier and a dual pole 2 Hz filter 3 Note Alternatively you can use the SCC TC02 as a 2 Hz lowpass bandwidth 100 mV input module Conventions The following conventions are used in this guide The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on the product refer to the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take gt g When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touchi
6. ection ratio Quiputirange ia itn i Transfer Characteristics Gain error Gain stability Offset error Offset stability Nonlinearity lt 5 auiaccnk Midi okies aes Recommended warm up time Temperature range is 23 C 5 C 2 Temperature range is 0 to 50 C SCC TC Series Thermocouple Input Modules User Guide 10 unless otherwise stated Thermocouples of types B E J K N R S and T 100 mV 10 MQ powered on 10 kQ powered off or overload 2 Hz 250 nA max assuming floating thermocouple 110 dB min 10 V max 100 0 08 max 0 0005 C max 5 uV max post calibration 0 6 uV C max 0 004 max ni com Measurement Accuracy Thermocouple Temperature Maximum Typical Type Range C Inaccuracy C Inaccuracy C B 400 to 600 2 5 0 31 600 to 1 800 2 0 13 E 200 to 100 2 1 76 100 to 600 1 1 600 to 1 000 1 5 0 6 J 200 to 100 2 1 6 100 to 500 1 0 9 500 to 1 100 1 5 0 72 K 200 to 100 2 5 1 25 100 to 600 1 25 0 67 600 to 1 200 2 0 45 N 200 to 100 2 5 2 100 to 1 300 2 0 7 R 50 to 0 3 1 24 0 to 100 2 0 82 100 to1 600 1 75 0 4 S 50 to 0 3 1 3 0 to 1 400 2 1 1 400 to 1 600 2 5 1 T 200 to 100 2 5 2 100 to 400 1 0 9 1 Total system measurement error for operating temperature within 5 C of calibration temperature Includes PCI AT MIO 16XE 50 one year accuracy specification
7. he Cold Junction Sensor section 3 Calculate the cold junction compensation voltage by converting the cold junction temperature from step 2 to a thermocouple voltage Use the polynomial expressions applicable to the type of thermocouple you are using 4 Apply the cold junction compensation to the thermocouple reading by adding the cold junction compensation voltage from step 3 to Vc 5 Calculate the thermocouple temperature by converting the voltage result from step 4 to a temperature Use the polynomial expressions applicable to the type of thermocouple you are using This calculation gives you a linearized temperature measurement ik Note Polynomials are from NIST Monograph 175 Uncompensated Connectors and Accuracy If you are using an SCC TC02 with an uncompensated SCC panelette temperature gradients between the module and the junctions on the panelette affect the accuracy of the measurements SCC TC Series Thermocouple Input Modules User Guide 6 ni com Detecting Open Thermocouples The SCC TCOX contains a 10 MQ pull up resistor that connects to 5 V to detect open thermocouples To determine if you have an open thermocouple check whether the corresponding E M Series DAQ device channel is saturated The pull up and bias resistors saturate the channel by applying 2 5 V at the input of an open channel This results in saturation to either the positive or negative rails of the EM Series DAQ device 10 V Errors Due to Ope
8. is the positive thermocouple lead and TC is the negative thermocouple lead The GND terminal connects to AI GND on the E M Series DAQ device The SCC TCOX has a 10 MO bias resistor connected from the negative thermocouple input to ground This resistor allows the thermocouple to be ground referenced or floating without requiring external bias resistors connected to ground The amplified thermocouple signal and cold junction sensor signal are measured by E M Series DAQ device channel X and channel X 8 respectively where X is 0 to 7 depending on where you plug the SCC TCOX Refer to Figure 1 for SCC TCOX signal connections For ANSI color coded J type thermocouples the red wire is negative and the white wire is positive Refer to the thermocouple data sheet if possible You can find information about other color coding schemes in the NI KnowledgeBase at ni com support SCC TC Series Thermocouple Input Modules User Guide 4 ni com E M Series Oar pee arc eee ee ences od DAQ Device _ A Ref 5V i Thermocouple 10 MQ Source i 10 kQ ni e ANY 2 Pole Filter TC Pole Filter Li i i ___pi Al x i lt i 10 KQ Buffer Stage bi x e WWW ni Te i i i ffset it i 3 wee Calibrator la GND Hi l SCC TC02 V only w l i Ref5v 1 AISENSE 4 75kQ 7 s 1 ni ALAND l o i 5 kQ 7 LM 4040 0 1 ni
9. n Thermocouple Detection Circuitry The open thermocouple detection circuitry can cause measurement errors These errors are the results of common mode voltage at the input of the SCC and current leakage into the signal leads The 10 MQ bias resistor in the SCC TCOX causes this error to be negligible With the 10 MQ bias resistor connected to ground and the 10 MQ pull up resistor connected to 5 VDC a current leakage of approximately 0 25 uA 5 V 20 MQ flows into the unbroken floating thermocouple Long thermocouple leads result in larger voltage drops due to lead resistance For example if you have a 24 AWG J type thermocouple that is 20 ft long a voltage drop of approximately 4 uV 0 145 O ft 0 658 O ft x 20 ft x 0 25 pA can develop in the thermocouple which corresponds to an error of 0 09 C With 10 MQ pull up and bias resistors a common mode voltage of 2 5 VDC develops if the thermocouple is floating The common mode rejection of the SCC TCOX is sufficiently high which results in the offset voltage being negligible in most applications If your application demands extremely high accuracy you can eliminate these errors by calibrating the system Refer to the Calibrating the SCC TCOX Using a Thermocouple Calibrator section for more information National Instruments Corporation 7 SCC TC Series Thermocouple Input Modules User Guide Cold Junction Sensor The cold junction sensor voltage output varies from 1 91 to 0 58 V
10. ng this component may result in bodily injury gt gt 7 NATIONAL p INSTRUMENTS bold italic monospace SC 2345 SCC Bold text denotes items that you must select in the software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes variables emphasis a cross reference or an introduction to a key concept Italic text also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions SC 2345 refers to both the SC 2345 connector block and the SC 2345 configurable connector SCC refers to any SCC series signal conditioning module What You Need to Get Started To set up and use the SCC TCOX you need the following items Q Hardware SCC 68 or C 2345 2350 with one of the following e SCC PWRO1 e SCC PWRO2 and the PSOI power supply e SCC PWRO3 requires a 7 to 42 VDC power supply not included One or more SCC 0X 68 pin E M Series DAQ device 68 pin cable Quick Reference Label Q Software The latest version of NI DAQmx SCC TC Series Thermocouple Input Modules User Guide 2 ni c
11. of 0 01 412 uV SCC TCO1 02 accuracy specification of 0 08 5 pV and reference junction measurement accuracy of 0 5 C Assumes averaging Non averaged single point reading has an additional uncertainty up to 0 1 C for J type thermocouple National Instruments Corporation 11 SCC TC Series Thermocouple Input Modules User Guide Cold Junction Sensor 3 Cold junction sensor accuracy 0 4 C max from 15 to 35 C 0 75 C max from 0 to 15 C and 35 to 55 C OUUTE 1 91 V 0 C to 0 58 V 55 C Note The accuracy specification includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature sensor and any thermocouple connector The temperature sensor accuracy includes component tolerances temperature drifts and self heating effects It does not include measurement device errors Open Thermocouple Detection Pull up resistor 10 MQ Bias Tesistor iscenirao iaa 10 MQ Maximum field wire gauge 0 16 AWG Power Requirement Physical Analog pOWer sssssssssseeseereeeerserrreereresreee 60 mW max FLS Vorea ans 2 mA max SIS V cia E aE 2 mA max Digital power 5 V wo eects 0 0 mW 1 87 cm 0 74 in 7 60 cm qe n p 2 99 in Figure 2 SCC TC01 Dimensions SCC TC Series Thermocouple Input Modules User Guide 12 ni com 1 87 cm 0 74 in ope 7
12. om Q Documentation One of the following e C 2345 2350 User Manual e SCC 68 User Guide SCC TC Series Thermocouple Input Modules User Guide Read Me First Safety and Radio Frequency Interference SCC Quick Start Guide Q Tools 1 8 in flathead screwdriver Numbers 1 and 2 Phillips screwdrivers Wire insulation strippers You can download needed documents from ni com manuals 3 Note Software scaling of measurements is not supported on the Macintosh operating system Refer to the Scaling Voltage Measurements section for more information about measurement scaling Device Specific Information 3 Note For general SCC module installation and signal connection information and information about the SC 2345 or SC 2350 carriers refer to the SCC Quick Start Guide Installing the Module UN Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires You can plug the SCC TCOX into any analog input socket on the SCC carrier The socket you select determines which E M Series DAQ device channels receive the SCC TCOX signals For single stage input conditioning plug the SCC TCOX into any socket J X 1 where X is 0 to 7 and connect the input signals to the module as described in the Connecting the Input Signals section If you use the SCC TCOX in a dual stage configuration the SCC TCOX must be the first s
13. over a 0 to 55 C temperature range 3 Note NI DAQmx includes thermistor conversion utilities that implement the equations listed below Refer to your software documentation for more information on these utilities You can use the following formulas to convert the cold junction sensor voltage to cold junction temperature T C Tg 273 15 where Tx is the temperature in degrees kelvin 1 Ty E a b InR7 c lnR7 where a 1 295361 x 103 b 2 343159 x 10 4 c 1 018703 x 107 Rris the resistance of the thermistor in ohms y R 5 000 TEMPOUT 2 5 V TEmMPOU where Vremupour is the output voltage of the cold junction sensor mra HCO Bes where T F and T C are the temperature readings in degrees Fahrenheit and Celsius respectively 3 Note V7emrour Varies from 1 91 V at 0 C to 0 58 V at 55 C For best resolution use the maximum gain for this range on the analog input channel For the cold junction sensor measurement accuracy refer to the Specifications section For more information about how to configure the SCC TCOX using NI DAQmx refer to the SCC Quick Start Guide SCC TC Series Thermocouple Input Modules User Guide 8 ni com Calibrating System Offsets To calibrate the offset voltage of the SCC TCOX in the system using the E M Series DAQ device complete the following steps The E M Series DAQ device must be powered for 30 minutes before you calibrate the offset voltage 1 Select
14. tage module Plug it into any socket J X 9 and plug the second stage SCC into socket J X 1 where X is 0 to 7 Connect the input signals to SCC TCOX as described in the Connecting the Input Signals section The SC 2345 connects the output signals of the first stage SCC to National Instruments Corporation 3 SCC TC Series Thermocouple Input Modules User Guide the inputs of the second stage SCC An example of dual stage conditioning in an SCC TCOX followed by an SCC LPO1 lowpass filter module Sockets J9 to J16 also are available for digital input output DIO conditioning or control Refer to the SC 2345 2350 User Manual for more information on configuring connecting and installing SCC modules ay Note SCC TCOX dual stage configuration is only available in NI DAQmx 7 1 or later Connecting the Input Signals 3 Note The signal names have changed Refer to ni com info and enter rdtntg to confirm the signal names The SCC TCO1 has a two prong uncompensated thermocouple miniconnector that accepts any miniature or subminiature two prong male thermocouple connector The SCC TC02 has a three position screw terminal connector that accepts 28 to 16 AWG thermocouple wires The screw terminal connector provides a ground connection for shielded thermocouples Otherwise the two modules function identically To use an SCC TC01 plug the male thermocouple connector into the module The SCC TC02 accepts up to three signals TC TC and GND TC
15. tic Compatibility This product is designed to meet the requirements of the following standards of EMC for electrical equipment for measurement control and laboratory use e EN 61326 EMC requirements Minimum Immunity e EN 55011 Emissions Group 1 Class A e CE C Tick ICES and FCC Part 15 Emissions Class A 3 Note For EMC compliance operate this device according to product documentation In addition all covers and filler panels must be installed SCC TC Series Thermocouple Input Modules User Guide 14 ni com CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows e 73 23 EEC Low Voltage Directive safety e 89 336 EEC Electromagnetic Compatibility Directive EMC 3 Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product visit ni com certification search by model number or product line and click the appropriate link in the Certification column Waste Electrical and Electronic Equipment WEEE f EU Customers At the end of their life cycle all products must be sent toa WEEE recycling center For more information about WEEE recycling centers and National Instruments WEEE initiatives visit ni com environment weee htm 1 0 Connector Pin Assignments Figure 4 shows the I O connector pins on the bottom of the module
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