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ST131 User`s Manual

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1. IT and Instrumentation for industry CONFIGURATION SOFTWARE Introduction This transmitter can only be configured and calibrated via its Configuration Software and a USB connection to your PC or laptop The configuration software can be downloaded free of charge from our web site at www acromag com This software is also included on a CDROM bundled with the Configuration Kit ST13C SIP see Accessories section For this model look for program ST131Config exe The software is compatible with XP or later versions of the Windows operating system The configuration software screen for this model is shown at left The configuration screen is divided into six sections as follows Device Connect Configuration amp Calibration Under Over Scale Thresholds Sensor Fault Break Detection Factory Settings Unit Status and the System Message Bar at the bottom of the screen A short description of each of these groups follows For a detailed explanation see Configuration Step by Step in the Technical Reference section of this manual HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and then click to point to a field or control to get a Help message pertaining to the item you pointed to Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 1 O Model ST13
2. This is a DIN rail bracket with mounting screws that connect to the ST130 Smart Transmitter to allow it to be snapped onto 35mm T type DIN rail or G type DIN Rail The screws and springs of this kit are identical to those provided in the Transmitter Mounting Kit ST130 MTG RRS Ss f az Aluminum Connection Head Explosion Proof Screw Cap NEMA 4 Rated Order 4001 115 This is an aluminum silver epoxy colored explosion proof screw cap connection head with 1 2 NPT egress and NPT ingress Enclosure material is S8316 with SS304 SS302 chain screws Enclosure cons material is alloy AL ADC12 with SS304 SS302 chain screws It is FM FMC Canada Class Division 1 Groups A B C D T6 Class II Ill Division 1 Groups E F G T6 NEMA 4 rated IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 3 6 Model ST131 06x0 Two Wire RTD Transmitter ACCESSORIES Stainless Steel Connection Head Explosion f j Proof Screw Cap NEMA 4X Order 4001 116 This connection head is a stainless steel screw cap explosion proof type with 2 NPT egress and NPT ingress Enclosure material is SS316 with S304 SS302 chain screws It is FM FMC Canada Class Division 1 Groups a B C D T6 Class II Division 1 Groups E F G T6 Class Ill NEMA 4X rated Aluminum Connection Head General Purpose
3. ma i Submit UJO Configuration Sensor Fault Break Detection Direction Downscale O upscale value URY 0 4mA CORY 1 0mA Submit Break Detection Factory Settings Restore Factory Settings Read Complete Device Connect e Scan for connected transmitters and open communications with them e Display the model number Product Name Manufacturer and Serial Number of the connected transmitter This section is used to scan for connected transmitters select a connected transmitter open communications with a transmitter and close connections with a transmitter Device connection Status is also indicated here along with the connected transmitter s ID info Product Name serial Manufacturer amp Serial Number Configuration Calibration Set the Input Type Platinum RTD or Resistance Set the input wiring to Two wire or Three Four wire sensor connections Set the alpha coefficient of your particular RTD curve Define your input temperature range or resistance range Define your output current range Read a unit s current configuration Calibrate your transmitter zero gain excitation and linearization Use the controls of this section to select an input type specify the input wiring specify the RTD alpha coefficient specify input range zero amp full scale and specify output zero amp full scale You must calibrate any changes you make in this section by clicking Start Calibration
4. 50 C 0 C or 50 C input zero is a fixed selection of 3 different values while the full scale is programmable to any value in range If you have a four wire sensor select Three Wire A selection of Two Wire requires that you additionally wire input terminals 3 amp 4 together with a short copper jumper wire A selection of Three Wire requires that a third lead be wired to input terminal 4 and the other end of this lead connects to the minus terminal at the sensor In both cases this third wire connection serves as the return path for the excitation current and it must be present in either form in order to make your measurement If you have actually wired a four wire sensor it will use 3 wire lead compensation IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 2 1 Select the Alpha Value CONFIGURATION Pt RTD Only for internal use only STEP BY STEP For the Pt RTD Input Type you should specify the Alpha Value of your i i particular RTD curve The software only uses this information to compute Reconfiguration the input resistances required to calibrate your selected input range for Platinum RTD Input Types which it then returns in message prompts during the calibration process If you are calibrating to a particular curve not indicated you may select this value arbit
5. If the error still occurs you should consult with the factory and arrange for the unit to be returned for repair or replacement Cannot Communicate with Transmitter via USB Loop power ON to the unit Unit requires a loop power connection even when connected to USB The loop power supply should also be present before connecting to USB A missing USB Isolator could cause a ground loop when connecting to USB from a Personal Computer A ground loop is created between a normally grounded two wire current loop and earth ground of the PC USB port Only connect to USB via a USB isolator like the Acromag USB ISOLATOR Otherwise use a battery powered laptop to configure the transmitter Unit fails to operate or has an erratic output signal Is input grounded IT and Instrumentation for industry This non isolated model is intended for use with ungrounded RTD probes and a grounded probe could inadvertently short the input bias voltage causing erroneous operation in particular if the output loop is already grounded Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 POSSIBLE CAUSE POSSIBLE FIX Two Wire RTD Transmitter 1 3 TROUBLE SHOOTING Unit drives a low current but fails to drive current at near above 20MA Loop supply voltage is too low to support full scale or over range current into the loop load Cannot Calibrate I
6. OC or 50C The return current sinking through the common mode resistance drives a positive biased differential voltage signal proportional to the RTD element resistance The differential voltage measured by the transmitter is corrected slightly to make it linear with temperature by modulating the sensor excitation current with a value determined during calibration then converted to a proportional process current at its output Because the currents in each lead match and if both the positive and negative leads to the RTD are of the same length type and diameter then the IR drop in these lines will create small common mode voltages that are effectively rejected by the differential instrumentation amplifier measurement In this way the measured signal is compensated for the additional resistance of the tlead wires without making a separate measurement Refer to the block diagram above to gain a better understanding of how this transmitter works Note that a third sensor wire is used to compensate the sensor for the resistance of the lead wires which can affect the accuracy of the RTD bulb given its low initial resistance 100 ohms at 0 C typical and its small change in resistance per degree of temperature change In this design the third lead wire is used as the return path for both the positive and negative sensor lead currents Then as long as both the positive and negative leads wires to the bulb are of the same type and length their in
7. and the maximum possible over range threshold is configured The non volatile memory of the transmitter receives its power from the loop supply not USB Therefore apply power to the transmitter output loop and always power the loop before connecting to USB 3 Connect the transmitter to the PC using the USB isolator and cables provided in Configuration Kit ST13C SIP refer to Electrical Connections section You may omit the isolator if you are using a battery powered laptop to connect to the unit Now that you have wired the unit applied power and connected the unit to USB you can execute the Configuration Software program for your model ST131Config exe to begin reconfiguration This software is only compatible with XP or later versions of the Windows operating system IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual 1 8 Model ST131 06x0 Two Wire RTD Transmitter CONFIGURATION After executing the Acromag Configuration software for this model a screen STEP BY STEP similar to the following will appear if you have not already connected to your transmitter via USB note some fields are faded out under these conditions Reconfiguration Y Acromag 1131 Configuration Software Device Connect Configuration Calibration HELP You can press F1 for Device Status Device Name s Input Type Help on a selected or Sensor Wiring highlighted f
8. button of the Calibration section to begin calibrating your selections Calibration is a simple two step process Resistance Input or three step process Pt RTD Input that adjusts the I O range zero the PGA gain and excitation and linearization Pt RTD only If you make a mistake and need to repeat a step just click Abort Calibration to restart from the beginning IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 2 3 Calibration is an interactive process in which the software prompts you to CONFIGURATION apply input signals and then measure the corresponding output current STEP BY STEP First it will prompt you to apply the zero input signal resistance then measure and record the corresponding zero output signal current Second it does the same for the full scale input resistance and the corresponding Zero amp Full Scale full scale output current signal it makes adjustments to gain at this stage Calibration but with linearization turned off Third for Pt RTD input types it enables linearization and prompts you to apply the full scale input resistance signal again and then measure and record the corresponding full scale output current it uses this second full scale measurement to adjust the magnitude of its linearization correction for the sensor There may still be combinations of ze
9. the 6 that follows denotes 2 wire loop powered The 0 or 1 following denotes CE Approvals Only or CE and UL cUL Class 1 Division 2 Approvals The last 0 digit refers to No SIL Approvals The optional C model suffix specifies custom calibration T131 0600 RTD Input Non lsolated CE Approved No SIL Certification T131 0600 C Same as first but w Customer Specified Calibration ST131 0610 Same as first but adds UL cUL Class 1 Division 2 Approval ST131 0610 C Same as third but w Customer Specified Calibration Note that ST131 models can be ordered with or without the factory calibration C option Factory calibration requires selection of input type Pt RTD or Resistance sensor wiring 2 wire or 3 4 wire Input Zero Value 50 C 0 C or 50 C for Pt RTD or Ohms for Resistance Input Full Scale up to 900 C or 9000 Output Zero Value 3 5 to 6mA Output Full Scale Value 16 24mA and Sensor Fault Detent Upscale or Downscale Models without the C suffix are calibrated by default for Pt100 RTD a 0 00385 O Q C 3 wire 0 C to 200 C input 4 to 20mA output upscale fault detection Recalibration of any model will require use of an ST13C SIP configuration kit ordered separately see Accessories Models can be mounted in DIN Form B connection heads using the ST130 MTG mounting kit or on DIN rail using the ST130 DIN kit These kits are purchased separately see Accessories Amp
10. the PC earth ground and the traditional current loop earth ground IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 1 T This section of the manual will walk you through the reconfiguration process CONFIGURATION step by step But before you attempt to reconfigure or recalibrate this STEP BY STEP transmitter please make the following electrical connections Calibration Connections Calibration 1 Connect a precision resistance decade box or RTD calibrator to the Connections input as required refer to Electrical Connections section Your resistance source must be adjustable over the range desired for zero and full scale A 3 wire or 4 wire sensor connection is recommended as this will compensate for sensor lead resistance this unit will use 3 wire lead compensation for 4 wire sensors Be sure to either wire a third lead to the remote sensor or install a short copper jump wire between input terminals 3 amp 4 of the transmitter as this serves as the return path for the excitation current and must be present for operation The input resistance source must be accurate beyond the unit specifications better than 0 1 A good rule of thumb is that your source accuracy should be four times better than the rated accuracy you are trying to achieve with the transmitter 2 Wire an output current loop to
11. 9 32V DC with the minimum voltage level set to supply over range current to the load plus 9V across the transmitter plus any transmission line drop e Variations in power supply voltage between the minimum required and 32V maximum has negligible effect on transmitter accuracy e Variations in load resistance has negligible effect on output accuracy as long as the loop supply voltage is set accordingly e Note the placement of earth ground in the current loop This is very important when making connection to USB and will drive the need for USB isolation see below e Always connect the output power wires and apply loop power before connecting the unit to USB MODEL ST131 0600 OUTPUT POWER WIRING NOTE OUTPUT TERMINALS ARE NOT POLARIZED PLUS amp MINUS LABELS ARE FOR REFERENCE ONLY OUTPUT TERMINALS 4 20mA lt OUT CO Cc DC SUPPLY Ge 9 32V out E SE L Ew THIS TRANSMITTER IS LOOP POWERED Rilo EARTH GROUND The output of this transmitter has a floating connection relative to ground which makes it flexible in the way it connects to various Receiver devices In most installations the loop power supply will be local to either the transmitter or local to the remote receiver Shielded twisted pair wiring is often used to connect the longest distance between the field transmitter and remote receiver The receiver device is commonly the input channel of a Programmable Logic Controller PLC a Digita
12. If more than one transmitter is connected via USB through a USB hub the software automatically opens a connection with one of the transmitters and Read Complete is indicated in the message bar at the bottom of the screen You can discern which transmitter is open by referring to the product s unique serial number indicated next to the Product Name If your intent was to open a different transmitter on the hub then you will have to Close the current connection and use the Device Name scroll bar to select another transmitter discern by serial number Then click Open to open it for communication If you break the USB connection to a transmitter the software will automatically close the connection for you When you reconnect the USB cable you will have to click Open to reopen communication with the transmitter If you have more than one transmitter connected via a hub then you will have to use the Device Name scroll bar to first select a transmitter discern unit by serial number and then click Open to open communication with it Note that you must already have loop power connected to the transmitter before you execute this software If you do not the software will prompt you to make this connection when you execute the software program If you later interrupt loop power while already using the software and while connected to USB you may have to re open communication with the unit IT and Instrumentation for ind
13. Screw Cap NEMA 4X amp IP68 Order 4001 117 This connection head is an aluminum screw cap general purpose type with 2 NPT egress and NPT ingress It is silver epoxy painted and NEMA 4X and IP68 rated Cast Iron Connection Head Screw Cap NEMA 4X Order 4001 119 This connection head is a cast iron black screw cap with 2 NPT egress and NPT ingress It is NEMA 4X rated IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com
14. and USB Interfaces anina iiaa 32 download our whitepaper Approvals cnori eaaa nidia 32 8500 904 Introduction to Two Enclosure and Physical 2 scsssssseeeeee 32 Wire Transmitters Environmenttal cccccccceeeceeeeeessseeeeeeeees 33 Reliability Prediction c ccceeeeeeeeeee eee 34 Configuration Controls ceseeeeeeeeeeeeeeeee 34 ACCESSORIES sosiaa aaa aia a 34 Software Interface Package sseeeeeeeeees 34 Transmitter Mounting Kit cceseeeeeees 34 USB Isolator oinnes a teiaa 34 Windows is a registered USB A B Cable USB A mini B Cable 35 trademark of Microsoft DIN Rail Adapter Mitisseten taes cnetiieiedtuied 35 Connection Heads 2 2 eeeeeeeeeeeeeeees 35 Corporation IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 3 The ST131 06x0 is an ANSI ISA Type II transmitter designed to interface DESCRIPTION with a Platinum RTD Resistance Temperature Detector sensor or resistance input and modulates a 4 20mA current signal for a two wire current loop This unit is setup and calibrated using configuration software and a USB connection to Windows based PC s Windows XP and later versions only The unit provides RTD sensor excitation linearization lead wire compensation and lead break or sensor burnout detect
15. of the input zero and full scale limits It also indirectly defines the fault current levels which will be 0 4mA below the under scale threshold for down scale detection and 1 0mA above the over scale threshold for upscale detection The Min Max range of adjustment has already been calibrated at the factory and the Min Max values indicated will vary between units Note that the range of adjustment for the threshold levels can vary as much as 10 of span between units for the same digital setting Zero amp Full Scale Calibrate your I O Range Selection Calibration IMPORTANT If you make any changes to the Configuration parameters you must re calibrate your input Any changes to the Input Type Sensor Wiring Input Zero Full Scale or Output Zero Full Scale are not written to the transmitter until you complete the calibration sequence that is initiated by clicking the Start Calibration button You can use the Get Config Calibration control button to read the current configuration of the unit if you like perhaps to determine the active configuration prior to recalibrating it Note that it will over write the configuration parameter selections of this screen that you may have just changed It a good idea to always check the current configuration selections to affirm your intentions before clicking Start Calibration After making your input type and I O range selections you can click the Start Calibration
16. the transmitter as shown in the Electrical Connections section You will need to measure the output current accurately in order to calibrate the unit You could connect a current meter in series in this loop to read the loop current directly Alternatively you could simply connect a voltmeter across a series connected precision load resistor in the loop then accurately read the output current as a function of the voltage IR drop produced in this resistor recommended In any case be sure to power the loop with a voltage that minimally must be greater than the 9V required by the transmitter plus the IR drop of the wiring and terminals plus the IR drop in the load To compute the IR drop be sure to use a current level that considers the over scale current and alarm limit by adding 1mA to the over scale threshold that you select this could be as high as 30mA depending on your selection of over scale threshold The output load resistance and meter must be accurate beyond the unit specifications better than 0 1 A good rule of thumb is that your load and meter accuracy should be four times better than the rated accuracy you are trying to achieve with the transmitter Loop Power Supply Make sure that your power supply voltage level is at least 9V plus 0 020 load_resistance Ideally it should be great enough to drive the over range alarm current into your load i e greater than or equal to 9V 0 030 Rload assuming the line drop is negligible
17. 0 of output Note that some under range is built in later via the Under scale Threshold selection which is set separately see below Note that this selection indirectly determines the PGA minus lead connection from the input multiplexer Different paths are chosen which have different pedestal resistors installed that happen to be set just below the corresponding resistance of the platinum input sensor at its zero temperature An equivalent sensor input resistance actually drives the differential signal measurement to OV For example the Resistance Input Type will use the 0 C pedestal resistor which is 98 80 Next enter your Input Full Scale temperature Pt RTD Input or full scale resistance Resistance Input Type Your Input Full Scale selection will correspond to 100 of output For Pt RTD you can enter any value up to 900 C For the Resistance input type you can enter any resistance value up to 900Q Note that the unit does convert under range and over range values outside of the 0 and 100 limits and this is set by separately selecting the output Under Over scale Thresholds IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 22 Model ST131 06x0 Two Wire RTD Transmitter CONFIGURATION Not all combinations of Input Zero and Input Full Scale will be possible The STEP BY STEP software may prompt you to make another selection Also if t
18. 1 06x0 Two Wire RTD Transmitter CONFIGURATION The Configuration Calibration section includes a type field where you are SOFTWARE prompted to enter measured current values for zero and full scale after starting calibration You can also read the current transmitter configuration with Get Config or Abort calibration if necessary Introduction Under Over Scale Thresholds e Select the output under scale and over scale thresholds to define your linear output operating range e Indirectly sets the upscale and downscale fault limits outside of your linear operating range to 1mA above over scale and 0 4mA below the under scale threshold settings You can refer to the Technical Reference section of this manual for a more detailed description of every control described here You can use the controls of this section to specify the under scale and over scale threshold levels of the output and the corresponding upscale amp downscale alarm limits Once you have made your selections you can click the Submit U O Configuration button to engage your settings Break Detection e Select output Downscale or Upscale lead break or sensor fault detection Use these controls to select Upscale or Downscale lead break detection then click the Submit Break Detection button to write your selection to transmitter memory Note that a lead break or sensor burnout will send the output to the upper or lower alarm level as directed by th
19. 51 500 C lt 40 1 2 1995 50 C up to 501 900 C Old JIS 1981 50 C up to 251 500 C lt 40 1 50 C up to 501 900 C lt 0 2 Resistance Linear 1 000 0 90007 Notes Table 1 Alpha a is used to identify the RTD curve and its value is derived by dividing the sensor resistance at 100 C boiling point of water minus the sensor resistance at 0 C freezing point of water by the sensor resistance at 0 C then by 100 C a R1o0c Rosc Roxc 100 C For Pt 1009 this is 38 50 100 0Q 100 C or 0 00385Q0 Q C and represents the average change in resistance per C The Zero of the range is a fixed choice of 50 0 C or 50 C for 3 wire RTD The 2 wire RTD input uses a fixed zero of 0 C 3 Rated accuracy applies for input spans greater than 50 C or 8Q and with a 16mA output span Reference Test Conditions 1000 Pt RTD a 0 00385 Q Q C 0 C to 200 C input 4 20mA output Upscale break detection ambient temperature 25 C power 24V DC R Load 250 Input Configuration Three wire w lead compensation four wire w 3 wire lead compensation or two wire w o lead compensation Input Gain PGA gain is adjustable for 6 25 12 5 25 50 100 200 and 400 mV mV PGA output voltage sinks current through 6 34KQ and a current gain of 50mA mA is applied to that current at the output stage Linearization Range Digitally adjustable correction 8 bit value 256 steps at 3 9nA mV per step set to zer
20. 90 For Pt391 Platinum Alpha 0 00391 Q QO C using reference 11 100 Alpha a is used to identify the particular RTD curve Alpha a is used to identify the RTD curve and its value is derived by dividing the sensor resistance at 100 C boiling point of water minus the sensor resistance at 0 C freezing point of water by the sensor resistance at 0 C then by 100 C a R100 C RO C RO C 100 C For Pt 100Q this is 38 50 100 00 100 C or 0 00385Q 0 C The configuration software will allow you to select the curve required for your application i e your alpha value It uses this value to calculate the corresponding input resistance required during calibration which it returns to you in calibration prompt messages Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 2 6 Model T131 06x0 CONFIGURATION STEP BY STEP Over Scale amp Under Scale Thresholds TIP Namur Limits For Namur compliant output limits you generally need to produce a linear output range from 3 8mA to 20 5mA and have a failure high limit greater than or equal to 22 5mA and a failure low limit less than or equal to 3 6mA TIP Error Detection Note that a checksum error can be distinguished at the output signal from a lead break error by selecting an under scale limit that is greater than the minimum threshold setting This is because a checksum error alwa
21. CK TRANSMITTER USB CONNECTION DRAWING HOST USB A MALE PERSONAL COMPUTER USB N RUNNING WINDOWS OS T ME 2 Je K ty gt USB ISOLATOR HOST PC RUNNING HOST USB SERIAL Z ACROMAG PORT CONNECTOR USB B MALE Acromag gi USB A MALE CONFIGURATION AT BACK OF PC 1 METER CABLE po MODEL USBISOLATOR SOFTWARE 2 y of j g a HEH s da E Fr 1 a I fp TRANSMITTER T131 0600 USB MiniB MALE 1 METER CABLE T HE E E IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter Q Y Acromag T131 Configuration Software Device Connect Configuration Calibration Device Status Device Name s Input Type Platinum RTD O Resistance 7131 0600 1111118 Sensor Wiring O Two Wire Three Four Wire Scan Close Alpha Value PT385 vw Input Zero Input Full Scale Product Name ST131 0600 1111118 Input Temperature 0 Mec 200 oe Range 7 i Output Zero Output Full Scale Manufacturer Acromag Inc Current Output SUPU ES iis l Range 4 000 ma 20 000 ma Serial 1111118 Measured Current mA Output Start Calibration Get Config Fault Status No Faults Under Over Scale Thresholds Under Range Value URV Read Status Reset Unit j 3 76 mA 3 04 C lin 2 42 ma Unit Status Over Range Value ORY 27 91 m 298 85 C Mn 23 00
22. HzZ 120Hz is normally reduced at the load by the transmitter but additional filtering at the load can reduce the ripple further For large 60Hz supply ripple connect an external 1uF or larger capacitor directly across the load to reduce excessive ripple For sensitive applications with high speed acquisition at the load high frequency noise may be reduced by placing a 0 1uF capacitor directly across the load TIP Inductive Loads If the two wire current loop includes a highly inductive load such as an I P current to pressure transducer this may reduce output stability In this case place a 0 1uF capacitor directly across the inductive load and this will typically cure the problem The unit housing is plastic and does not require an earth ground connection Earth Ground If the transmitter is mounted in a metal housing a ground wire connection is Connections typically required and you should connect the metal enclosure s ground terminal green screw to earth ground using suitable wire per applicable codes See the Electrical Connections Drawing for Output Power and note the traditional position of earth ground for the two wire output current loop The Type II transmitter output terminals have a floating connection relative to earth ground Earth ground is normally applied at the output loop power minus terminal and in common with the loop load or loop receiver minus e Do not earth ground any input lead and use only insulated non gro
23. Manual C Acromag 4 USB Programmable DIN Form B Connection Head Transmitter Model ST131 0600 amp ST131 0610 Two Wire Transmitter RTD Input USER S MANUAL Copyright 2010 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 895 B11A002 IT and Instrumentation for industry 7 Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 2 Model ST131 06x0 Two Wire RTD Transmitter TABLE OF IMPORTANT SAFETY CONSIDERATIONS You must consider the possible negative effects of power wiring CONTENTS component sensor or software failure in the design of any type of control or monitoring system This is very important where property Symbols on equipment loss or human life is involved It is important that you perform satisfactory overall system design and it is agreed between you and A Acromag that this is your responsibility GETTING STARTED DESCRIPTION isisisi inaa eaa 3 Means Refer to User s Key Features csccssccccceesesssseceeesesssseeess 3 Manual this manual for APpliCationisecieceice ioc ccee ose cele evectee tee einne 3 additional information Mechanical Dimensions 0 000000ee0e 4 The information of this manual ELECTRICAL CONNECTIONS A 5 may change without notice Sensor Input Connections rune aaa 5 Acromag makes no warranty Output Power Connections EE 6 of any kind with regard to this Earth Ground Co
24. N50082 1 Test is applicable only to ports interfacing with cables whose length may exceed 3M Surge Immunity 0 5KV to output power per IEC1000 4 5 Level 1 0 5KV and European Norm EN50082 1 Surge applied to AC side of AC DC adapter per standard Not applicable to signal ports that interface via cables whose total length is less than 3 meters Conducted RF Immunity CRFl 3Vrms 150KHz to 80MHz AM 80 1KHz per IEC61000 4 6 Emissions per European Norm EN61000 6 4 2007 Radiated Frequency Emissions 30 to 1000MHz per CISPR11 Meets or exceeds European Norm EN50081 1 for Class B equipment IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual 34 Model ST131 06x0 Two Wire RTD Transmitter SPECIFICATIONS Reliability Prediction MTBF Mean Time Between Failure MTBF in hours using MIL HDBK 217F FN2 Per MIL HDBK 217 Ground Benign Controlled GgGc ST131 06X0 25 C TBD hrs Consult Factory 40 C TBD hrs Consult Factory Configuration Controls Software Configuration Only via USB This transmitter produces an analog output current proportional to a sensor input based on the voltage measured across the sensor resistance No switches or potentiometers are used to make adjustments to this transmitter Its analog output level and behavior is instead determined via register values stored in non volatile EEPROM memory in the transmitt
25. Note that the software automatically opened the connection with the transmitter and Read Complete is indicated in the message bar at the bottom of the screen Additionally most fields and controls are not faded out and await your input IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Acromag ST131 Configuration Software Device Connect Configuration Calibration Input Type Platinum RTD O Resistance O Two Wire Three Four Wire Device Status Device Name s Sensor Wiring Praes w Scan Close Product Name 5T131 0600 1111118 Alpha Value Input Zero Input Full Scale Input WEISS lo Y oc 200 oc Range L Output Zero Output Full Scale mA 20 000 mA Measured Current mA Output Start Calibration Under Over Scale Thresholds Under Range Value URW Reset Unit 7 Min 2 42 ma Current Output Manufacturer Acromag Inc i Range 4 000 Serial 1111118 Get Config Unit Status Fault Status No Faults Read Status 3 76 m 3 04 C Over Range Value ORV 27 91 mA 298 85 C Min 23 00 ma J Submit UJO Configuration Sensor Fault Break Detection O upscale ORY 1 0ma Direction Downscale Value URY 0 4ma Submit Break Detection Factory Settings Restore Factory Settings Read Complete
26. _Ohms If connections are OK and you measure a voltage drop across the sensor than your sensor value is likely out of range or the unit has been miscalibrated IT and Instrumentation for industry TROUBLE SHOOTING Diagnostics Table Before attempting repair or replacement be sure that all installation and configuration procedures have been followed and that the unit is wired properly Verify that power is applied to the loop and that your loop power supply voltage is sufficient to supply over scale current into the load MIN 0 020 Rload plus 9V at the unit terminals plus any line drop If your problem still exists after checking your wiring and reviewing this information or if other evidence points to another problem with the unit an effective and convenient fault diagnosis method is to exchange the questionable unit with a known good unit Acromag s Application Engineers can provide further technical assistance if required Repair services are also available from Acromag Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 1 2 Model ST131 06x0 TROUBLE SHOOTING Diagnostics Table Two Wire RTD Transmitter POSSIBLE CAUSE POSSIBLE FIX Output goes 0 4mA below selected Under Range Value URV This is the Down scale alarm level and indicates the input signal exceeds the common mode range of the input This can also occur if the third senso
27. age window at the bottom of the screen You need to adjust your input signal to the full scale input value noted Measure the corresponding output current accurately and type the measured output current in milliamps into the Measured Current Output field Then click the Go To Step 3 button only Pt RTD inputs will require a 3 step Note that at this point your output signal will not be an accurate full scale output RTD Input as linearization is OFF and calibration has not been completed The second step only sets the gain of the PGA amplifier to drive the full scale output but without RTD linearization turned on If your Input Type is Resistance your calibration is complete after this step because no special linearization correction applies your output is already linear with resistance You simply need to click the Complete Calibration button to continue and your resistance transmitter should be calibrated Pt RTD Input only After clicking Go to Step 3 the following message will be displayed 1131 Config A Step 3 Linearization Calibration Please set your input to 280 98 Measure the corresponding output current and enter the measured value into the Measured Output Current field Step 3 reads just like Step 2 except the RTD linearization circuit has been activated and your output signal shifts closer to your desired full scale output level Click OK and this message is repeated in the prompt window
28. ages are indicated below 0 or None Normal Operation No Faults 1 IN Exceeds Positive Limit 2 IN Exceeds Negative Limit IN Exceeds Positive Limit IN Exceeds Negative Limit IN Exceeds Positive Limit amp IN Exceeds Positive Limit IN Exceeds Positive Limit amp IN Exceeds Negative Limit IN Exceeds Negative Limit amp IN Exceeds Positive Limit IN Exceeds Negative Limit amp IN Exceeds Negative Limit Error Reading Unit Check Connections and try again Note A two wire sensor input cannot correctly register IN errors as this always requires a third lead to the sensor A break in IN will return Fault Level 3 the same as a break in IN If an IN error is flagged with a two wire sensor t is referring to the short jumper wire placed between terminals 3 amp 4 of the unit which supplants the third sensor lead for two wire input connections Failure to install this jumper for 2 wire sensors will drive error level 5 see below Normally after clicking Read Status No Faults will be indicated and Read Complete Normal Operation inputs in range will be displayed in the message bar For a 3 wire sensor a break in the IN lead will return Fault Code 3 Positive Input Exceeds Positive Limit A break in the IN lead will return Fault Code 1 Negative Input exceeds Positive Limit A break in the third lead that connects to terminal 4 will return Fault Code 5 Posi
29. at the bottom of the screen The transmitter needs your output reading with linearization enabled to adjust the RTD linearization correction current for the sensor excitation You don t need to readjust your input signal at this step as it uses the same full scale input from the prior step 2 Simply measure your output signal and input the new measurement taken note that it will be closer to the full scale output than it was in step 2 as linearization is ON Type the measured output current in milliamps into the Measured Current Output field Then click the Complete Calibration button and the following message will appear your output may shift slightly to reflect an adjustment to linearization 7131 Config At this point the transmitter is calibrated Click OK to continue Check the Calibration Complete accuracy of a few other points Note that d sae fae acl ett if your input type is Pt RTD your output will be linear with the input temperature not the input resistance Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual Two Wire RTD Transmitter 2 D Model ST131 06x0 If your output appears imprecise you may need to repeat calibration but being very careful to take accurate measurements and enter the measured output currents correctly and using milliamps as your units Make sure that you carefully drive the precise input signal resistances necessary for calibration If mea
30. ck your under scale and over scale threshold levels For example you could disconnect an RTD lead to check your O U alarm limits which should be 0 4mA below the under scale threshold for a downscale break or 1mA above your over scale threshold for an upscale break Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 2 T Select Upscale or Downscale Lead Break Detection CONFIGURATION Upon sensor burnout or a broken sensor lead you can select Downscale STEP BY STEP to send the output current to the under scale alarm limit which is 0 4mA less than the under scale threshold Otherwise you can select Upscale Break Detection to send the output to the over scale alarm limit which is 1mA above the over scale threshold By using alarm levels outside of a defined linear operating range a lead break or open sensor can be easily discerned from an over range or under range input signal by noting its current level Optional Read Status amp Reset Unit Read Status amp Reset You can use the Read Status button to display fault status information Unit relative to the input signal The fault status error level will be indicated in the Fault Status message field and any additional diagnostic information will be displayed in the message window at the bottom of the screen Possible fault status levels and diagnostic mess
31. ded to interface with insulated non grounded sensors Installation Category Suitable for installation in a Pollution Degree 2 environment with an Installation Category Over voltage Category II rating per IEC 1010 1 1990 Shock amp Vibration Immunity Unit rated to 5g Random Vibration 5 500Hz in 3 axis at 2 hours axis per IEC60068 2 64 Mechanical Shock to 50g 3ms with 3 half sine shock pulses in each direction along 3 axis 18 shocks and 30g 11ms with 3 half sine shock pulses in each direction along 3 axis 18 shocks per IEC60068 2 27 Radiated Field Immunity RFI Designed to comply with IEC1000 4 3 Level 3 10V M 80 to 1000MHz AM amp 900MHz keyed and European Norm EN50082 1 Electromagnetic Interference Immunity EMI The transmitter output has demonstrated resistance to inadvertent output shifts beyond 0 25 of span under the influence of EMI from switching solenoids commutator motors and drill motors Electromagnetic Compatibility EMC Minimum Immunity Per European Norm EN61000 6 2 2005 Electrostatic Discharge ESD Immunity 4KV direct contact and 8KV air discharge to the enclosure port per IEC61000 4 2 Radiated Field Immunity RFI 3V M required 80 to 1000MHz 3V M 1 4 2 0GHz 1V M 2 0 2 7GHz AM 80 1KHz per IEC610004 4 Electrical Fast Transient Immunity EFT 0 5KV to output power w coupling clamp and fast transients to AC side of AC DC adapter Complies with IEC1000 4 4 Level 1 0 5KV and European Norm E
32. des transient voltage suppression on USB power and data lines USB Connector 5 pin Mini USB B type socket Molex 5000751517 PIN DEFINITION S OO 5V Power Includes Inrush Current Limiting Differential Data Differential Data NC Not Connected Power Ground Connects to Signal Ground via ferrite bead Signal Ground Connects directly to Signal Ground Note Most Host Personal Computers except battery powered laptops will connect earth ground to the USB shield and signal ground Inrush Current Limiting Unit includes series inrush current limiting at its USB power connection Cable Length Connection Distance 5 0 meters maximum Driver No special drivers required Transmitter uses the built in USB Human Interface Device HID drivers of the Windows Operating System Windows XP or later versions only Approvals xx00 Pending CE marked EMC Directive 89 336 EEC Pending Pending UL Listed UL3121 First Edition UL1604 cUL Listed Canada Standard C22 2 No 1010 1 92 Hazardous Locations Class 1 Division 2 Groups A B C amp D Consult factory for availability of other approvals Enclosure amp Physical General purpose plastic enclosure intended to be mounted in DIN Form B connection heads Optionally a DIN rail adapter is available for mountable to 35mm T type DIN rail or G Type DIN rail Dimensions Diameter 44 5mm 1 752 inches Height 23 4mm 0 921 inches Refer to Mecha
33. digital ground is connected in common to USB power signal ground and shield ground and will make connection to earth ground when directly connected to the USB port of a Personal Computer without the use of an isolator Failure to connect without isolation would force a potential difference between earth ground at the PC and the earth ground normally applied in a properly grounded two wire current loop This would drive an inadvertent ground loop that will interfere with operation and could damage the unit For this reason USB isolation is strongly recommended when connecting to a PC Otherwise in the absence of USB isolation a battery powered laptop could be used to connect to the unit as the laptop does not normally connect to earth ground IT and Instrumentation for industry Two Wire RTD Transmitter USB Interface Includes a USB socket for temporary connection to a PC or laptop for the purpose of setup and reconfiguration During reconfiguration and calibration the transmitter receives power from both the USB port and the output loop and both power sources must be present to calibrate the unit CAUTION Do not attempt to connect USB in a hazardous environment Transmitter should be setup and configured in a safe environment only Data Rate USB v1 1 full speed only at 12Mbps Up to 32K commands per second USB 2 0 compatible Consult factory for a low speed 1 5Mbps version if required Transient Protection Unit inclu
34. dividual contributions to the differential signal cancel out as equal IR drops in each lead and the precise voltage across the RTD element is measured directly proportional to its sensed temperature Without this third lead the sensor excitation current returns via the minus lead and combines with the minus lead current in the small jumper placed between terminals 3 amp 4 of the transmitter for a 2 wire sensor connection This unbalances the sensor measurement preventing lead wire compensation The current returned via the third sensor lead is shunted through a common mode resistor effectively biasing the input signal above OV and into the common mode input range of the amplifier The small resistance of this line adds a small common mode voltage that increases the bias and is essentially rejected by the amplifier Note that if the sensor is connected via two wires the lead wire resistance is not compensated for For two wire sensors you additionally have to include a small jump wire between leads 3 amp 4 which allows the combined excitation currents to reach the common mode shunt resistor and properly bias the sensor Note that any 2 wire sensor can be made to compensate for its lead wire resistance by simply adding a third lead to the sensor in place of the jumper and for this unit that third lead can be a different size and type of material than the input leads to the sensor IT and Instrumentation for industry Amplicon Sal
35. ed by a quadratic equation The linearity DAC uses positive feedback from the input signal to produce a system response that is also nearly quadratic but curving in the opposite direction producing a net response that is very linear This DAC allows the nonlinearity error to be calibrated out by modulating the excitation current with the input signal of the RTD during calibration and will produce a nearly 40 1 improvement in linearity The adjustment range of this linearity correction is set via the 15 8K Rlin resistor which has been optimized for increased accuracy for the most common spans that occur between 50 C and 500 C The PGA includes a zero DAC that allows the magnitude of the zero output current to be precisely adjusted near 4mA The output voltage of the PGA voltage amplifier is converted to current through a 6 34K Rvi resistor at its output just prior to the current amplifier that drives the output loop The current gain of this output current amplifier is 50x Note that the output loop is bridge coupled to the transmitter making the transmitter output polarity insensitive The USB port ground is common to the circuit ground The USB port ground of most PC s is common to the USB cable shield and earth ground The output current loop is typically earth grounded at the loop supply minus connection For this reason it is recommended that USB signals be isolated when connected to a PC to prevent a ground loop from occurring between
36. er The contents of these registers are automatically uploaded at power up and will determine excitation amplifier gain zero offset linearization and other options of the embedded ASIC The contents of these registers are programmed using a temporary USB connection to a host computer or laptop running a Windows compatible configuration software program specific to the transmitter model This software provides the framework for digital control of the contents of these registers All register information is stored in non volatile EEPROM memory except for Control Register 1 the Fault Status Register and the Checksum Register All control registers are read write capable except for the Fault Status Register Refer to Configuration Step by Step of this manual for detailed information on available software control of this model ACCESSORIES Software Interface Package Configuration Kit Order ST13C SIP USB Signal Isolator USB A B Cable 4001 112 USB A mini B Cable 4001 113 Configuration Software CDROM 5039 312 This kit contains all the essential elements for configuring ST130 Smart Transmitters Isolation is recommended for USB port connections to these transmitters and will block a potential ground loop between your PC and a grounded current loop A software CDROM is included that contains the Windows software used to program the transmitter panen Transmitter Mounting Kit Order ST130 MTG e M4 Mounting Screw 1010 456 2pcs e Rel
37. erly or if the EEPROM contents have been corrupted A checksum error will also send the output current to 0 4mA below the lowest under scale threshold setting until reset via this control or by toggling loop power OFF ON A persistent checksum error could indicate a defective transmitter Optional Factory Settings You can use the Restore Factory Settings button to restore the transmitter configuration to the original factory state see Specifications Reference Test Conditions including the optional settings over under scale amp and break detection This control provides a potential recovery path should the configuration ever become corrupted during recalibration perhaps due to miscalibration For example if during calibration you break the USB connection before completing calibration the EEPROM checksum value could be corrupted and this would inhibit normal operation Alternately this button can be used as a sanitation tool to restore the unit to its initial configuration Note that the Reset Unit control of Unit Status sends the unit to its power up or stored configuration different from this control which sends the unit to its initial factory configuration Model Numbers ST13 Input Isolation Power Approvals SIL Calibration ST13 is the model Series The prefix ST denotes the Smart Transmitter family The trailing 1 digit denotes an RTD input type The 0 after the hyphen denotes non isolated
38. es 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 1 4 Model ST131 06x0 Block Diagram Two Wire RTD Transmitter TECHNICAL REFERENCE Vs yY USB PORT USB CONVERTER EEPROM V V x a V FILTERING NOT SHOWN FOR CLARITY CONTROL LOGIC 1 NON ISOLATED TRANSMITTER INTENDED FOR UN GROUNDED RTD PROBES M IREF DAC EO c OAN re esi lt j REFERENCE VOLTAGE ETY 1 193V IREF1 y IREF1 IREF2 OUTPUT vO 4gaua 1 MATCHED AD 6 IREF2 k a a A j AY agaua SUB REGULATOR N F ds cg meo ZERO DAC GATE DRNER o es _ POWER 9To32v0c MUX Scion INPUT LEADS MUST BE K FN BRIDGE SAME LENGTH SIZE TYPE G Ve x50 CURRENT AMP 420ma Pal Gabon FOR LEAD COMPENSATION PGA 2 mO e 1 Vo 6340 P Sk 1 O mx x 5 a Loan ne 7 o __ o Q lt 3 a Ww ge LINEARIZER PIRTD lt a ez eo RVI 492uA 2 via 2 A 2 3 B low j INPUT Pd eA Rz Rady 4 Rz sets input 505 Rzo z soc Rz sets input range zero lt 796 9 8 118 a g lout 50 Vo 6340 a d A 5 ai 721A 2 o Rz forces diff input voltage near 0 at Tmin Sa sa 5 RLIN RSET x2 Rom sets a bias within common mode voltage range BUA m g AY IREF1 2 5 Vref 12100 3 WIRE RTD CONNECTION Re Vem 0 467V CMV of IR in each lead is rejected by amplifier Key Points
39. es 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 1 6 Model ST131 06x0 Two Wire RTD Transmitter Block Diagram The zero point of the calibrated range is set via zero resistor Rz that is connected in series in the minus input lead From the factory three resistance values are installed in three separate minus lead paths and are at ohm values just below that of a 100Q Pt RTD corresponding to temperatures 50 C 0 C and 50 C Note that for two wire sensor connections only a 0 C input range zero may be selected The voltage drop produced in Rz drives the differential voltage measured across the sensor to be near zero at Tmin of the RTD range as the excitation current in each lead is matched The combined excitation current of each lead is then shunted into a 475O common mode resistor Rem producing a positive bias for the input sensor within the input common mode range of the differential amplifier as it ensures that the lowest common mode input voltage is greater than the minimum range limit of the amplifier Note that the excitation currents are digitally adjustable via the Iref DAC From the factory this current is set to a nominal value of 493uA via the 12 1K Rset resistor 480uA to 510uA range It can be digitally adjusted to other levels during calibration The excitation current values are also influenced by the linearity DAC All RTD s have a nonlinear response over temperature that is approximat
40. he input zero and full scale points are chosen too close together performance will be i degraded A minimum span of 50 C is recommended Note that you will Reconfiguration have to be able to precisely drive the corresponding input range resistance values for zero and full scale in order to calibrate your input range later Select the Output Range Zero and Output Range Full Scale In the Output Zero and Output Full Scale fields enter the output currents that are to correspond to 0 and 100 of output respectively This is typically 4mA and 20mA respectively but you could optionally specify an output zero from 3 5mA up to 6 0mA or an output full scale from 16mA up to 24mA Note that the output range over scale and under scale thresholds are specified separately and will determine the linear operating range of the output including possible over under range outside of these approximate limits If the output zero and full scale points are chosen too close together performance will be degraded Use input spans greater than 50 C The actual operating range limits of your input sensor will depend on the linear output operating range defined by the output under scale and over scale threshold limit settings set separately below Threshold limiting allows you to define an under scale threshold typically between 2 1mA and 3 6mA and an over scale threshold between 21mA and 30mA This indirectly corresponds to a linear operating range outside
41. ief Spring 1011 358 2pcs evens QR fos an ton a This kit contains two M4 mounting screws and relief springs for mounting this transmitter in DIN Form B Connection Heads The screws in this kit are of a special design that is semi captive to the ST130 enclosure Order 1 kit per transmitter aa m e a era aa AIS KIIIN CH IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual Model ST131 06x0 Two Wire RTD Transmitter 3 5 USB Isolator Order USB ISOLATOR ACCESSORIES O e USB Signal Isolator e USB A B Cable 4001 112 e Instructions 8500 900 This kit contains a USB isolator and a 1M USB A B cable for connection to a PC This isolator and cable are also included in ST131C SIP see above USB A B Cable Order 4001 112 e USB A B Cable 4001 112 This is a 1 meter USB A B replacement cable for connection between your PC and the USB isolator It is normally included with the ST13C SIP Software Interface Package and also with the isolator model USB ISOLATOR USB A mini B Cable Order 4001 113 e USB A mini B Cable 4001 113 peZ This is a 1 meter USB A miniB replacement cable for connection between the USB isolator and the ST130 transmitter It is normally included in ST13C SIP Series ST DIN Rail Adapter Order ST130 DIN e DIN Rail Adapter 1027 187 e M4 Mounting Screw 1010 456 2pcs e Relief Spring 1011 358 2pcs
42. ield or control Alpha Value You can also click the Input Zero Input Full Scale 2 Input Temperature button in the upper right hand Proac Manet Range lt mk Output Zero Output Full Scale corner of the screen and click Manufacturer Curent Output to point to a field or control to Serial p ig i get a Help message pertaining j berries E E to the item you pointed to Unit Status Fault Status Under Over Scale Thresholds Under Range Value URY 0 00 m 0 00 C Min ma Over Range Value ORV 0 00 m 0 00 C Min m Sensor Fault Break Detection Direction Value URY 0 4ma ORY 1 0mA Factory Settings Note that without a device already connected via USB the Device Status field indicates Disconnected After you connect USB the first step to begin reconfiguration is to select the device to connect to using the scroll window of the Device Name field Use the scroll bar to click on and select a transmitter from this list in order to open it for reconfiguration use the serial number to discern a particular transmitter Then click the Open button to connect to the selected device If your transmitter was already connected via USB when you booted this software your screen will look more like the one below where the software has already initiated a connection to the transmitter for you see Device Connect area and note that Device Status indicates Connected
43. inals 3 and 4 at the transmitter Alternately if you want to compensate for sensor lead wire resistance do not include this jumper but add a third copper lead from the sensor to terminal 4 as shown in the 3 wire connection figure e Four Wire Input Sensors Use 3 Wire Lead Compensation MODEL ST131 0600 INPUT SENSOR WIRING INPUT PLATINUM RTD OR RESISTANCE SHIELDED CABLE 4 WIRE 3 WIRE 2 WIRE f TERMINALS r OO od C DO NOT GROUND INPUT LEADS OPT SHIELD GROUND u ADD JUMPER 2 WIRE ONLY IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 6 Model ST131 06x0 Two Wire RTD Transmitter ELECTRICAL This transmitter has an ANSI ISA Type 2 output in which the power and CONNECTIONS output signal share the same two leads and the transmitter has a floating connection with respect to earth ground In these applications output wires normally pass through the output channel on top of the transmitter and are rawn through the egress path of the connection head Connect a Output Power d through th th of th tion head C taDC Connections power supply and load in series in the two wire loop as shown in the drawing below e Output connections are not polarized The and designations are for reference only with current normally input to Output and returned via Output e Loop supply voltage should be from
44. ion It also offers an adjustable input and output range with adjustable alarm levels Fully analog signal path input signal is not digitized Key Features Converts sensor signal with a single differential measurement Digitally setup and calibrated w Windows software via USB Pt RTD or Linear Resistance input support Adjustable input range up to 900 C or 9000 Adjustable input excitation linearization and output range Connects to two three or four wire sensors Lead wire compensation 3 wire Up or down scale lead break burnout detection Adjustable output error alarm levels outside of operating range Non polarized two wire current output Convenient two wire loop power Provides a linearized or non linearized output response Adjustable under range and over range levels Namur compliant High measurement accuracy and linearity Wide ambient temperature operation Hardened For Harsh Environments Designed for DIN Form B sensor head mounting Optional DIN Rail Adapter for T type amp G type rail CE Approved Pending UL cUL Class 1 Division 2 Approved Model ST131 0610 Pending This transmitter is designed for mounting in DIN Form B connection sensor Application heads commonly used in thermowell applications for sensing temperature Optionally a DIN rail adapter may be purchased for mounting the unit to T type or G type DIN rail Its non isolated input is intended to mate with non grounded 1000 Pt RTD te
45. is setting The alarm levels are outside the output operating range and are 1mA above the over scale threshold or 0 4mA below the under scale threshold Factory Settings e Restore a transmitter to its original factory calibration e Restore a transmitter to its initial factory configuration You can click the Restore Factory Settings button if you ever miscalibrate a transmitter in such a way that its operation appears erratic Unit Status e Test the integrity of your USB connection to the transmitter e Read the Fault Status of your input signals wrt the input amplifier e Reset the transmitter sets the transmitter to its power up configuration Use the Read Status control to test communication with the unit and to obtain diagnostic information relative to the input Input Fault Status will be returned on the Fault Status line and in the system message bar at the bottom of the screen Use the Reset Unit control to revert to the power up or stored configuration or to clear a checksum error Refer to Read Status of the Configuration Step by Step section for more information Message Bar e Displays the Fault Status of your transmitter input signal e Displays prompt instructions during calibration The system message bar at the bottom of the screen will display amp repeat prompt instructions as you step through calibration It also displays diagnostic messages after clicking Read Status IT a
46. justment range is additionally limited via the configuration software Output Span 4 20mA nominal Optionally an output zero from 3 5mA to 6mA and a full scale from 16mA to 24mA may be configured Span adjustment is determined by the combination of PGA gain and sensor excitation with 3 methods of digital adjustment PGA gain selection reference current coarse adjustment and reference current fine adjustment The span expressed as lo Vin from the PGA to the output amplifier has an adjustment range from 49 3mA V to 3150mA V Additionally the linear operating range of the output may be extended via the under scale and over scale threshold settings set separately Your effective adjustment range is additionally limited via the configuration software IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 3 1 Output Fault Alarm Limits Downscale fault level is 0 4mA below the SPECIFICATIONS selected under scale threshold typical Upscale fault level is 1 0mA above the selected over scale threshold typical The unit can be set for limits that comply with NAMUR NE43 recommendations Output Compliance 8 6V Minimum transmitter Will drive 15V typical with a 24V supply and 20mA loop current Output Ripple Less than 0 1 of output span Output Limiting Output current limit is programmable and limited to an o
47. l Control System DCS or a panel meter Some receivers already provide excitation for the transmitter and these are referred to as sourcing inputs Other receivers that do not provide excitation are referred to as sinking inputs and these will require that a separate power supply connect within the loop Here are example transmitter connection diagrams for sourcing and sinking receiver types IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual Model ST131 06x0 Two Wire RTD Transmitter 24VDC POWER SUPPLY COMMON TWO WIRE TRANSMITTER CONNECTIONS TO SOURCING AND SINKING INPUT RECEIVERS I E LECTRI CAL i i 24VDC l DCS PLC SOURCING 9 CON N ECTIONS 2 INPUT CARD 4 6 P 24VDC Twisted Pair Twisted P DCS PLC SINKING TRX COC TRX INPUT CARD Output Power 5 tnt s Connections RCV RCV Ci sting the ST131 Two Wire Tr jitter to E Lane Comer SEC EGRnL e ES lt 24V DC Excitation Provided by Separate Power Vv WARNING For compliance to applicable safety and performance standards the use of twisted pair output wiring is recommended Failure to adhere to sound wiring and grounding practices as instructed may compromise safety performance and possibly damage the unit TIP Ripple amp Noise Power supply ripple at 60
48. licon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 2 Q Input Specifications SPECIFICATIONS Input Configurable for 1000 Platinum RTD from 50 C to 900 C or for linear resistance from 0Q to 9000 Unit provides sensor excitation linearization lead wire compensation 3 wire and sensor fault lead break detection Consult factory for 10000 Pt RTD support Input Zero Adjust For Pt RTD w 3 or 4 wire connection select 50 C 0 C or 50 C For Pt RTD w 2 wire Connection input zero is fixed at 0 C For Resistance input zero is user specified in ohms OQ or 1000 typical Some zero values in ohms will not be acceptable and the software may prompt you to make adjustments Input Full Scale Adjust For Pt RTD specify a full scale temperature up to 900 C For Resistance input specify a resistance up to 9000 Minimum recommended span is 50 C RTD and 8Q Resistance Accuracy Linearity Accuracy is dependent on the calibration region as shown in Table 1 Note that accuracy is generally better than 0 1 of the calibrated range for regions below 500 C For Platinum RTD input type linearity and accuracy is optimum for calibrated spans within the region of 50 to 500 C Table 1 RTD Ranges and Accuracy toe ne gaa aay Input Type Alpha Spans in Range Accuracy Pt385 100Q 1 385 50 C up to 250 C lt 0 05 IEC751 Amendment 50 C up to 2
49. mits Input Filter Bandwidth 3dB at 700Hz typical normal mode filter Input Response Time Output completes transition within 500us typ Input Bias Current 50pA typical PGA doubling every 10 C Output Specifications Output Range 4 to 20mA DC nominal An output zero from 3 5mA to 6mA and an output full scale from 16mA to 24mA may be optionally configured The linear operating range including over range is also digitally adjustable between the Under scale amp Over scale limits selected Over scale limit is adjustable from 20 5 to 30mA typical and the under scale limit is adjustable from 2 1 to 3 6mA typical Output Zero Adjust 4mA nominal adjustable from 3 5mA to 6mA Sets value corresponding to 0 of output and is adjusted independent of under range threshold Hardware uses digitally controlled 7bits sign coarse amp fine DAC s with 256 steps of adjustment in each Zero code output level is 4 116mA Coarse adjustment is 0 029mA step with a typical coarse adjustment range from 3 77mA to 3 77mA at the output Fine adjustment is 0 0018mA step for an adjustment range of 236uA to 236uA at the output Your effective adjustment range is additionally limited via the configuration software Output Full Scale Adjust 20mA nominal adjustable from 16 24mA Adjusted independent of under range and over range thresholds Sets value corresponding to 100 of output and adjusted independent of over range threshold Your effective ad
50. mperature probes common to these thermowell applications It provides an output current linearized to the RTD sensor temperature Optionally it can support simple resistance input and drive an output current linear to the sensor resistance The output signal is transmitted via a two wire 4 20mA current loop The two wire current signal can be transmitted over long distances with high noise immunity Sensor lead break detection and the inherent live zero output offset offers convenient I O fault detection should an I O wire break IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 4 Model ST131 06x0 Two Wire RTD Transmitter Mechanical Dimensions Connection Head Mounting Te DIN Rail Mounting 35mm T Type DIN Rail Dimensions in millimeters inches Note that this transmitter conforms to the mechanical limits set forth in the German standard DIN 43 729 for the Form B head style and can be easily mounted in DIN Form B connection and thermowell protection heads similar to the figure at upper left G T DIN Rail ni l The M4 mounting screws and relief springs used to attach the transmitter to the connection head are ordered separately via Acromag Mounting Kit ST130 MTG see Accessories section The unit may be optionally mounted to 35mm T type or G type DIN rail using the optional DIN mounting kit ST130 DIN as shown at lef
51. nd Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Two Wire RTD Transmitter 1 1 Model ST131 06x0 POSSIBLE CAUSE POSSIBLE FIX Software Fails to Scan Transmitter i Software Fails to Scan Transmitter Bad USB Connection Recheck USB Cable Connection Loop power was enabled after connecting to USB You must enable the loop power supply before connecting to USB With loop power present disconnect then reconnect the USB cable to the transmitter USB has not enumerated the device Use the reset button on the Acromag USB isolator to trigger renumeration of the transmitter or simply unplug replug the USB cable to the transmitter Communication or power was interrupted while USB was connected and the configuration software was running Close the current connection with the software re scan the transmitter select and re open the transmitter for communication or simply exit the Configuration software and reboot it Output Erratic Not operational or at Wrong Value Missing USB isolation If your two wire output current loop is grounded then connecting USB to the transmitter will drive a ground loop between your current loop and earth ground at the PC Always use USB signal isolation or alternatively you can connect directly to a battery powered laptop which does not earth ground its USB connection Othe
52. nical Dimensions drawing Conforms to DIN 43 729 Form B size requirements 1 0 Connectors Barrier strip type captive screw terminals wire range AWG 14 28 solid or stranded Program Connector USB Mini B type 5 pin Case Material Self extinguishing polycarbonate ABS plastic UL94 V 0 rated base material color blue USB dust cap material is Santoprene 251 70W 232 color red Terminal Material Captive 4 40 threaded steel screw and 0 040 inch thick Phosphor Bronze terminal material Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 3 3 Circuit Board Military grade fire retardant epoxy glass per IPC 4101 98 SPECIFICATIONS with humi seal conformal coating DIN Rail Mounting The unit can be optionally mounted to 35x15mm T type DIN rails using optional ST130 DIN DIN rail mounting adapter kit Refer to the Mounting amp Dimensions section for more details Shipping Weight 0 5 pounds 0 22 Kg packed Environmental These limits represent the minimum requirements of the applicable standard but this product has typically been tested to comply with higher standards in some cases Operating Temperature 40 C to 80 C 40 F to 176 F Storage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 non condensing Isolation Input amp output are not isolated from each other for this model Model is inten
53. nnections A ETT 7 material including but not USB Connections 2ccccceececeeeeeeeeeeaeees 8 limited to the implied CONFIGURATION SOFTWARE 2 2 02eeee 9 warranties of merchantability Introduction sunsnnnunununsnosnnnunnnnnanannnnnnnnnnnnnnnnnn 9 and fitness for a particular TROUBLESHOOTING ccccccseseeeeeeeeeeaeesenes 11 purpose Further Acromag Diagnostics i eee ee ee 11 assumes no responsibility for any errors that may appear in TECHNICAL REFERENCE this manual and makes no BLOCK DIAGRAM c ccceccececeeeceseeeeaeeeeeaneeeas 14 commitment to update or CONFIGURATION STEP BY STEP 020 200 17 keep current the information Calibration Connections 2 0sseseeeee 17 contained in this manual No Reconfiguration Parameters 2 00 18 part of this manual may be Zero amp Full Scale Calibration 00008 22 copied or reproduced in any Over Scale amp Under Scale Thresholds 26 form without the prior written Break Detection ccceceeeeeeeeeeeeeeeeeeeeeaees 27 consent of Acromag Inc Read Status amp Reset Unit 8 27 Factory SettingS cccceeeeeeeeeeeeeeeeeeeeeeenens 28 SPECIFICATIONG 2 22 2 2 2 eeceeeeeeeeeeeeeeeeeeeees 28 Model NUMbE PS ceceeeeeeeeeeeeeeeeeeeeeeee 28 For additional information Mputa tanina 29 please visit our web site at OulPp te aa a a esters 30 www acromag com
54. nput Channel Is input wired properly Check power supply voltage level Make sure it is at least 9V plus 0 020 Rload If transmission distance is long than it must have additional voltage to support the IR drop in the wire Ideally the voltage should have ample overhead to drive the load at the maximum output current which is 1mA above the Over Range Value that you set Diagnostics Table Service amp Repair Assistance This unit contains solid state components and requires no maintenance except for periodic cleaning and transmitter configuration parameter zero and full scale Check input wires at terminals 2 3 amp 4 verification The potted Missing third input terminal connection Cannot Calibrate Input Channel You may have damaged the input PGA via a ground loop or incorrect wiring Does not Operate or calibrate properly with a 2 wire input connection Are you missing the jumper required between input terminals 3 and 4 You must include a wire to terminal 4 of the transmitter either from the sensor itself 3 wire sensor connection or a small jumper wire between terminals 3 amp 4 at the transmitter 2 wire connection Surface Mounted Technology SMT board contained within this enclosure is impossible to repair except for firmware It is highly recommended that a non functioning transmitter be returned to Acromag for repair or replacement Acromag has automated test equipmen
55. o for linear resistance input The maximum linearization coefficient is 0 99UA mv Alref AVin Additive to excitation current to accomplish linearization of Pt RTD inputs Pt3911 1009 1 3911 50 C up to 250 C lt 0 05 IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual 30 Model ST131 06x0 Two Wire RTD Transmitter SPECIFICATIONS Excitation Currents Utilizes dual current sources one for each sensor lead matched within 0 2 Set to 0 493mA typical with less than 10ppm C drift over temperature zero code level for each is between 0 480mA and 0 510mA Digitally adjustable via Coarse and Fine DAC s with 256 steps of adjustment for each 7bits sign bit Coarse adjustment is 195 to 195uA w 1 54uA step Fine adjustment is 12 2 to 12 2uA with 96nA step Also adjusted via linearization feedback for Pt RTD input types see below Lead Wire Compensation For balanced sensor leads same size length amp type and only with 3 or 4 wire sensor connections Recommended maximum lead resistance is 25Q per lead Lead Resistance Effect Output shift less than 0 01 per ohm of lead resistance with a max shift less than 0 1 with up to 100 per lead Lead Break Sensor Burnout Detection Select output upscale or downscale detection Alarm output level is indirectly programmed via the linear U O threshold settings see Output Fault Li
56. of Operation Signal Path is Analog Unit is Loop Powered Input is Non Isolated Conversion is Differential Configuration is Digital Calibration is Digital Converts RTD with a Single Measurement Output Power Terminals are Not Polarized Only Leads must be balanced for lead compensation 3 This digitally calibrated analog transmitter uses a unique low noise voltage to current conversion scheme that delivers 12 bit equivalent performance but does not actually digitize the input signal Instead it uses integrated Digital to Analog Converters DAC to adjust the zero offset control the excitation currents and drive linearization correction to the input These DAC s work together to achieve nearly 12 bits of adjustment resolution but do not operate directly on the analog input signal itself Likewise there are no microcontrollers in the I O signal path of this design and no embedded firmware relative to processing the signal Transmitter functionality is actually hard wired integrated into an application specific component IC The only microcontroller in this design is used to convert the external USB signals to an internal SPI bus signal during reconfiguration Windows configuration software is used to write configuration parameters into non volatile EEPROM memory at setup These stored parameters are auto downloaded into the transmitter ASIC at power up and will define its normal ope
57. pply voltage excessive over range current does drive excessive power dissipation in the output pass transistor of the transmitter and will cause the unit to get warm This could be troublesome at elevated ambient temperatures and in hazardous environments particularly for output currents near 30mA e Use the Under Range Limit slide control to select an approximate under scale threshold You have 8 levels of under scale threshold adjustment between Min amp Max typically between 2 1mA and 3 6mA Your selection will be indicated in the field just above the control e Use the Over Range Limit slide control to select an approximate over scale threshold You have 16 levels of over scale threshold adjustment between Min amp Max typically between 21mA and 30mA Your selection will be indicated in the field just above the control After making your adjustments click the Submit O U Configuration button to write your adjustments to non volatile transmitter EEPROM memory The linear operating range of your output is now defined between the limits you specified Your under scale and over scale thresholds also indirectly correspond to a linear operating reqion that usually extends outside of the input zero and full scale limits you specified Additionally the sensor fault break detent output levels are set outside the linear operating region so that you can discern them from simply an over range or under range input signal You should che
58. quivalent RTD resistance of the input zero value you specified and returned that value in this prompt Click OK and this message is repeated in the system message window at the bottom of the screen You need to adjust your input signal to the zero input value noted Because this input is a Pt 1000 sensor and 0 C is our input zero our input signal should be precisely set to 100 00 ohms Measure the corresponding output current and type the measured current in milliamps into the Measured Current Output field Then click the Go To Step 2 button 2 After clicking Go To Step 2 the following message will be displayed 1131 Config A Step 2 Full scale calibration Please set your input to 280 98 Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Mianual 2 4 Model ST131 06x0 CONFIGURATION STEP BY STEP Zero amp Full Scale Calibration IT and Instrumentation for industry Two Wire RTD Transmitter Now the unit needs to calibrate its gain to produce your full scale endpoint The software used your input type and alpha information to compute the equivalent RTD resistance of the input full scale value you specified and returned that value in this prompt Click OK and this message is repeated in the system mess
59. r wire is missing 3 4 wire RTD a lead has broken the sensor has burned out or open or the jumper between terminals 3 amp 4 of the transmitter is not installed 2 wire RTD A Downscale alarm level is normally driven by a sensor fault such as an open sensor or broken sensor lead with the transmitter lead break detection set to down scale It can also be triggered by a very high sensor resistance that looks like an open sensor to the transmitter Check your sensor resistance sensor connections and your connection to input terminal 4 to restore input operation You can also check your sensor connections by measuring a voltage drop across your input resistance approximately equal to 0 5mA Sensor_Ohms If connections are OK and you measure a voltage drop across the sensor than your sensor value is likely out of range or the unit has been miscalibrated Output goes 0 4mA below the lowest possible Under Range Value An output level 0 4mA below the lowest URV setting can be indicative of a checksum error encountered in a data exchange with the internal EEPROM memory This assumes that you have not configured an Under Range Value to its lowest setting This is a rare error that is not likely to occur If it is persistent it may indicate a unit defect You can reset the transmitter to clear this error or simply cycle power to the transmitter If it continues to occur then you should try restoring factory calibration
60. rarily and just substitute your own resistance values during calibration that will correspond to your particular curve at the temperatures noted Note Alpha a is used to identify the RTD curve and its value is derived by dividing the sensor resistance at 100 C boiling point of water minus the sensor resistance at 0 C freezing point of water by the sensor resistance at 0 then by 100 C a R100 Roc Rov 100 For Pt 10022 this is 38 5 2 100 0 2 100 C or 0 00385 C and represents the average change in resistance per C Select the Input Range Zero and Input Range Full Scale Next you need to select the input temperature range for the Pt RTD Input Type or your input resistance range for the Resistance Input Type For Platinum RTD types use the scroll bar to select your Input Zero temperature 50 C 0 C or 50 C Zero is a fixed value for Pt RTD For Resistance Input Type you instead enter an Input Zero value in ohms 0Q typical for a 0 5000 range or 1000 typical for a 100 2000 range Note that some zero values will not be acceptable and the software may prompt you to make adjustments Note that if you choose 0Q as your input zero then your under scale threshold selection below cannot be achieved except for the purpose of setting the downscale alarm limit which is 0 4mA below your under scale threshold setting Your selection of Input zero is the RTD temperature or input resistance that will correspond to
61. ration Setup involves selecting the input type Pt RTD or Resistance input wiring 2 wire or 3 4 wire the Pt RTD alpha coefficient the input range zero 50 C 0 C or 50 C the input range full scale up to 900 C or 900Q the output range zero the output range full scale specifying the output over and under scale thresholds and alarm detents and setting upscale or down scale lead break or sensor fault detection IT and Instrumentation for industry Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Amplicon Manual Model ST131 06x0 Two Wire RTD Transmitter 1 5 This transmitter uses a unique signal processing method that reduces error Block Diagram by converting the 3 or 4 wire sensor with a single differential measurement including the lead wire compensation During operation a small excitation current is passed through the positive lead of the RTD element A matching excitation current is passed through a zero pedestal resistor Rz and into the minus lead of the sensor element These currents combine and return to the unit via a third lead that is terminated with a common mode resistance in the unit 3 wire connection The voltage drop produced in the series connected zero resistor of the minus lead has the effect of driving the differential input voltage across the bulb and in parallel with the input amplifier near OV for bulb temperatures near the minimum temperature for the RTD range 50C
62. red See Below You may use Acromag model USB ISOLATOR to isolate your USB port or you can optionally use another USB signal isolator that supports USB Full Speed operation 12Mbps e Configuration Requires USB and Loop Power This transmitter draws power from both the current loop and from USB during setup e Connect Loop Power Before USB Always connect the transmitter to its loop power supply before connecting USB or erratic operation may result IMPORTANT All USB logic signals to the transmitter are referenced to the potential of its internal signal ground This internal ground is held in common with the USB ground and shield ground The potential of the transmitter s current output pin output minus relative to earth ground will vary according to the load current and load resistance net IR drop Without isolation this IR voltage drop would drive a potential difference between the normally grounded current loop and the grounded USB connection at the PC causing a ground loop that would inhibit setup and calibration and may even damage the transmitter This is why an isolated USB connection is recommended You could alternately avoid the use of an isolator if a battery powered laptop was used to connect to the transmitter and the laptop has no other earth ground connection TO HOST USB PORT MINIPU
63. ro and full scale that you will not be able to adjust and calibrate the unit for For example this might occur for very tight input spans or odd endpoints The Configuration Software will usually let you know when you need to adjust your desired limits as you enter them CAUTION RTD Input levels outside of the nominal input range of the unit 50 to 900 C or 0 9000 will not be accepted for configuration of zero or full scale Since not all input levels can be validated during field programming connecting or entering incorrect signals will produce an undesired output response By default the unit is factory calibrated to a 1000 Pt385 RTD type using a 3 wire sensor connection and a 0 to 200 C input span to drive a 4mA to 20mA output span For our example below we will instead use the 0 to 500 C portion of the Pt RTD type to drive a 4 to 20mA output range Transmitter Zero Full Scale amp Linearizer Calibration Procedure 1 After configuring your input type and I O ranges you can begin calibrating the transmitter by clicking the Start Calibration button and the following message will appear 1131 Config A Step 1 Zero calibration Please set your input resistance to 100 00 Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field Your unit needs to calibrate its zero signal The software used your input type and alpha information to compute the e
64. rwise Verify loop power and voltage level Try Closing the connection and re opening it Output goes to Over Range Value ORV or Under Range Value URV This indicates that the input signal is out of range If the level is 1mA above the ORV or 0 4mA below URV then this would indicate a sensor fault or lead break Check your input signal with respect to your calibrated range and reduce or increase it as required to drive your output current within its linear operating range Also check the wiring of your input sensor Output goes 1mA above the selected Over Range Value ORV This is the Upscale alarm level and indicates the input signal exceeds the common mode range of the input This can also occur if the third sensor wire is missing 3 4 wire RTD a lead has broken the sensor has burned out or open or the jumper between terminals 3 amp 4 of the transmitter is not installed 2 wire RTD An Upscale alarm is normally driven by a sensor fault such as an open sensor or broken sensor lead with the transmitter lead break detection set to upscale It can also be triggered by a very high sensor resistance that looks like an open sensor to the transmitter Check your sensor resistance sensor connections and your connection to input terminal 4 to restore input operation You can also check your sensor connections by measuring a voltage drop across your input resistance approximately equal to 0 5mA Sensor
65. suring voltage across the output load resistance make sure that you use the exact input resistance when calculating the current measured Also make sure that you have an adequate input span as too tight input spans will magnify error Refer to the following table when using a resistance substitution box to drive the input zero and full scale signals This contains the resistance values for the two most common Pt RTD alpha types Optionally you can determine resistances using an online calculator based on a different reference standard For example try the calculators at http www minco com tools sensorcalc Platinum RTD Resistance Versus Temperature Temperature in Ohms TEMP C 1009 Platinum RTD Pt385 c 0 00385 Pt391 a 0 00391 200 18 52 150 39 72 17 26 38 79 100 60 26 59 64 0g EE o S 92 16 92 04 00000000 100 00 100 00 20 107 79 107 91 115 54 115 78 119 40 119 70 100 138 51 139 11 150 157 33 158 22 200 175 86 177 04 250 194 10 195 57 300 212 05 213 81 350 229 72 231 76 247 09 249 41 264 18 266 77 500 280 98 283 84 550 297 49 300 61 375 70 380 10 390 48 395 12 Note Shaded values fall outside the supported zero range for the ST131 IT and Instrumentation for industry CONFIGURATION STEP BY STEP Zero amp Full Scale Calibration Note For Pt385 Platinum alpha 0 003850 Q C using the European curve reference ITS
66. t see Accessories section IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual Model ST131 06x0 Two Wire RTD Transmitter 5 Wire terminals can accommodate 14 28 AWG solid or stranded wire Input wiring may be shielded or unshielded twisted type Ideally output wires ELECTRICAL should be twisted pair Strip back wire insulation 3 8 inch on each lead and CONNECTIONS wrap the bare wire in a clockwise direction around the terminal screw and below the SEMS washer Tighten the screw to secure the wire Terminals include wire loops for test clip attachment or for redundant soldered wire connection required for heavy shock and vibration applications Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed Output wires are normally separated from input wiring for safety as well as for low noise pickup Sensor wires are passed up through the center of the transmitter and wire Sensor Input directly to transmitter input terminals 1 2 3 and 4 as shown in the Connections connection drawings below Observe proper polarity when making input connections e Use Insulated or Non Grounded Sensors Only Input is non isolated Do not ground any input leads e Two Wire Input Sensors Require Jumper For a 2 wire sensor you must connect a short copper jumper wire between input term
67. t that thoroughly checks and calibrates the performance of each transmitter and restores firmware Please refer to Acromag s Service Policy and Warranty Bulletins or contact Acromag for complete details on how to obtain repair or replacement If you cannot get the output signal to vary for a continuously variable input signal your input signal is within range and you have properly wired the input including connections to input terminal 4 then your input amplifier may have been damaged and the unit will need to be replaced Check input wiring and make sure that terminals 3 amp 4 are jumpered together for 2 wire connections Note that the third lead from the sensor or the jumper between input terminals 3 amp 4 forms the return path of the sensor excitation current and must be present to operate the unit Output shifts momentarily while using Read Status or Get Config Reading Writing the EEPROM memory momentarily consumes more current and this is evident by a momentary glitch in output current during reconfiguration IT and Instrumentation for industry Memory is powered by the loop supply This is normal during reconfiguration via USB using the Configuration software and reflects the increased current draw during memory access Note that the contents of memory is uploaded at power up and repeated access of memory is not required during normal operation except for reconfiguration Amplicon Sal
68. the Start Calibration button in order to actually write those changes to the transmitter Select the Input Type In the Calibration section of this screen select an input type Platinum RTD or Resistance e f you select Platinum RTD your output will be linear with respect to sensor temperature not resistance and you will additionally have to use the Alpha Value scroll window to select your particular RTD curve type alpha is only used by the software to recommend resistance values during calibration e f you select Resistance your output current will be linear with respect to sensor resistance not temperature and no special linearization will be performed Select the Sensor Wiring This selection tells the unit which inputs to connect to its internal PGA and which inputs to connect its excitation sources to e f you select Two Wire your input measurement will not be compensated for the sensor lead resistance and your input range zero will be fixed at 0 C Pt RTD Note that in most thermowell applications the sensor leads are less than 2 feet long and will have negligible resistance minimizing the importance of lead wire compensation in these applications e f you select Three Wire your input measurement will be compensated for its lead wire resistance as long as the input leads are of the same length size and type Additionally you will be able to select an input zero of
69. tive Input exceeds positive Limit and Negative Input exceeds Positive Limit For a 2 wire sensor a break in the IN lead and or IN will return Fault Code 3 Positive Input Exceeds Positive Limit A missing jumper between terminals 3 amp 4 of the transmitter will return Fault Code 5 Positive Input exceeds positive Limit and Negative Input exceeds Positive Limit The following table summarizes the Fault Levels returned for a break or open in each of the input leads LEAD BREAK 2 WIRE FAULT 3 WIRE FAULT 4 WIRE FAULT 1 M Not Flagged 2 IN 3 IN 4 L 3 4 Jumper IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 2 8 Model ST131 06x0 CONFIGURATION STEP BY STEP Factory Settings SPECIFICATIONS Model ST131 0600 Signal Transmitter RTD Input Non lsolated Two Wire Loop Powered CE Approved Pending No SIL Approvals Model ST131 0610 Adds UL cUL Class 1 Division 2 approvals Pending Add a C model suffix to specify Custom Calibration of the transmitter IT and Instrumentation for industry Two Wire RTD Transmitter You can use Reset Unit to reset the transmitter and cause it to revert to its power up or last saved configuration This will also clear a very rare checksum error which can occur if the transmitter fails to read its configuration from the EEPROM prop
70. unded RTD sensors This transmitter does not isolate its input signal e Respect the traditional position of earth ground in a two wire current loop and avoid inadvertent connections to earth ground at other points which would drive ground loops and negatively affect operation This includes a USB connection to the transmitter which should be made via a USB isolator as most Personal Computers earth ground their USB ports and this makes contact with both the signal and shield grounds IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 8 Model ST131 06x0 Two Wire RTD Transmitter ELECTRICAL This transmitter is setup configured and calibrated via configuration CONNECTIONS software that runs on a Windows based PC that is connected to the unit via USB Windows XP or later version required Refer to the drawing below to connect your PC or laptop to the transmitter for the purpose of USB Connections reconfiguration and calibration using this software WARNING The intent of mating USB with this transmitter is so that it can be conveniently setup and calibrated in a safe area then installed in its connection head which may be in a hazardous area Do not attempt to connect a PC or laptop to this unit while installed in a hazardous environment as USB energy levels could ignite explosive gases or particles in the air e USB Signal Isolation Requi
71. ustry Two Wire RTD Transmitter 1 Q CONFIGURATION amp CALIBRATION Reconfiguration HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and click to point to a field or control to get a Help message pertaining to the item you pointed to Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 2 0 Model ST131 06x0 Two Wire RTD Transmitter CONFIGURATION Open the Transmitter for Communication STEP BY STEP Once you have opened a transmitter for communication the device status will change from Ready to Connected and the transmitter ID information will be displayed in the Product Name Manufacturer and Serial Number fields At this point the connected transmitter is ready for reconfiguration and the appropriate configuration fields become active and await your input Reconfiguration If you want to see how the connected unit is already configured before changing its configuration click the Get Config button of the Configuration amp Calibration controls to retrieve its current configuration information Note the message bar at the bottom of the screen and it should display a message like Read Complete Normal Operation inputs in range IMPORTANT If you make any changes to the Configuration Parameters you will have to recalibrate the unit via
72. ver scale threshold value that you configure less than or equal to 30mA Output Power Supply 9 32V DC SELV Safety Extra Low Voltage 30mA maximum The supply voltage across the transmitter must not exceed 36V even with a shorted load The supply voltage level must be chosen to provide a minimum of full scale current to the load 0 020 R typical plus 8 6V minimum to the transmitter terminals plus any line drop Ideally your supply should drive over scale and alarm current levels into the load alarm level is 1mA above the over scale threshold selected Reverse polarity protection is included as output terminals are bridge coupled and not polarized The output polarity labels on the enclosure are for reference only CAUTION Do not exceed 36VDC peak to avoid damage to the unit Terminal voltage at or above 8 6V minimum must be maintained across the unit during operation Output Resolution Not Applicable Input signal is not digitized The signal path is fully analog with digital controls for offset excitation and linearity The effective adjustment resolution is approximately 12 bits for reference test conditions Output Response Time For a step change in input signal the output reaches 98 of final value in less than 500us typical with a 250Q load Output Load Resistance Effect Less than 0 005 of output span effect for 100Q change in load resistance Accuracy Refer to Table 1 for relative accuracy referred to the input Accurac
73. y will vary with calibrated input and output span Rated accuracy assumes 50 C minimum input span and 16mA output span Accuracy includes the effects of repeatability terminal point conformity and linearization but does not include sensor error Ambient Temperature Effect Better than 0 008 per C of input span or 80ppm C over the ambient temperature range for reference test conditions Includes the combined effects of zero and span drift over temperature Power Supply Effect Less than 0 001 of output span effect per volt DC change Load Resistance Range Equation Rioag Max Vsupply 9V 0 020A for full scale output current assuming negligible line drop This does not account for over scale or alarm current levels and you should adjust the denominator in this expression for your particular alarm current level At 24V DC Road 0 750Q typical for 20mA of loop current and no line drop Note Additional filtering at the load is recommended for sensitive applications with high speed acquisition rates high frequency noise may be reduced by placing a 0 1uF capacitor directly across the load For excessive 60Hz supply ripple a 1uF or larger bulk capacitor is recommended at the load IT and Instrumentation for industry Amplicon Sales 44 0 1273 570 220 Website www amplicon com Email sales amplicon com Manual 3 2 Model ST131 06x0 SPECIFICATIONS IMPORTANT USB Isolation is recommended The transmitter
74. ys sends the output signal to a level that is 0 4mA below the lowest threshold setting until reset 1 8mA If you select an under scale threshold value greater than the minimum then you ensure that the downscale alarm level limit 0 4mA below the threshold does not overlap with the checksum error level indication IT and Instrumentation for industry Two Wire RTD Transmitter Select The Over Under Scale Thresholds amp Alarm Levels This unit allows you to select over scale and under scale output range thresholds which determine the linear operating range of your output They also indirectly define the upscale amp downscale alarm error limits The downscale detent will be set to a current level 0 4mA below the under scale threshold The upscale detent will be set approximately 1 0mA above the over scale threshold In this way a lead break or open sensor fault can be easily discerned from simply an over range or under range input signal The range of adjustment for the under amp over scale thresholds is calibrated at the factory and indicated via the Min and Max value fields adjacent to the slide controls Note that the threshold levels can vary as much as 10 of span between units for the same digital setting and this will be reflected by differing values for Min and Max between units The Min Max limits of adjustment are calibrated at the factory CAUTION For a low resistance or shorted load and a high loop su

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