User`s Manual: Series 350T Model 350T Millivolt
Contents
1. 248 624 1541 30765 S Wixom Road P O Box 437 Fax 248 624 9234 Wixom Michigan 48393 7037 USA Copyright 1993 Acromag Inc Printed in USA Data and specifications subject to change without notice 8500 327 B93J012 Series 350T User s Manual Millivolt Thermocouple INSTRUCTIONS SERIES 350T Millivolt Thermocouple DC Powered Transmitters INTRODUCTION These instructions cover the model types listed in Table 1 below Supplementary sheets are attached for units with special options or features Table 1 A Model Number Format 350T Input Output Mtg Certification Calibration B Typical Model Number 350T TC1 Y DIN NCR C Output Mounting Certification Calib Y DIN NCR Blank 0 Approval C V5 Notes Table 1 The MV1 MV2 and be ordered with or without factory calibration option All other input types except custom linearizer ranges automatically include calibration to the customer s specification no C needed Any customer specified calibration information will be included on a separate calibration label on the unit For thermocouple units the TC type input calibration and TC Break Detection UP DOWN or NONE must be specified Consult the factory for current information on agency e g Canadian Standards Association etc approvals xx Range Code Number Standard range code will have a number 01 12 etc Consult the selection and ordering guide for s2. 350T SERIES 550 SERIES 350T TRANSMITTER TRANSMITTER TRANSMITTER TRANSMITTER TRANSMITTER TRANSMITTER w 12 ac Lo c NOTE INPUT GROUND G TERMINAL IS NOT CONNECTED INTERNALLY SERIES 350T SERIES 350T SINGLE TRANSMITTER TO POWER MULTI TRANSMITTER POWER SUPPLY CONNECTIONS SUPPLY CONNECTIONS 1 OPTION Ems 2 OPTION POWER SUPPLY CONFIGURATIONS ELECTRICAL CONNECTIONS 191 224591 254
3. Acromag 4 User s Manual Series 350T Model 350T Millivolt Thermocouple DC Powered Transmitters Table of Contents Page T trodU COTn zz us E ENTE EY ds 2 D SCEUDEIOH coo ye ca cos diee ade ftat ia Idem 3 Specifications cx cate ce aee ecoute ase 3 Inst llation au teet iot 7 aes Sinead v e E M Sha EIER RUE 9 General Mamtenance o ee to eet 13 List of Drawings Electrical Connections MV TC Input No 4501 249 14 Calibration Connections MV TC Input No 4501 250 15 Configuration Jumper Location MV TC Input No 4501 251 16 Dimensions DIN Rail Mounting No 4501252 17 Electrical Connections Power Supply Configurations No 4501 254 18 It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility Acromag Inc Tel
4. L TRANSMITTER CONFIGURATION JUMPERS SEE DRAWING 4501 251 TRANSMITTER ADJUSTMENTS THERMOCOUPLE EXTENSION WIRE J NOTE EITHER OF THESE ACROMAG SERIES 320 THERMOCOUPLE REFERENCE FOR IRON COSTANTAN NOTE TYPE OF TC REFERENCE MUST MATCH TC TYPE USED 115V AC POWER CIRCUITS MAY BE USED TO CALIBRATE THERMOCOUPLE INPUTS DC POWER SUPPLY rm VOLTAGE V V5 CURRENT Y TYPICAL 350 TRANSMITTER JUMPER INSTALLED mr ome ew ow mV TC CALIBRATION CONNECTIONS sser me 4501 250 ZERO AND SPAN JUMPER SELECTION IN OUT OUT IN ZERO JUMPER SPAN JUMPER EXAMPLE CONFIGURATION ZERO JUMPER IN PIN 5 to 6 SPAN JUMPER IN PIN 1 to 2 E BOARD INTERCONNECTION INPUT TYPE SELECTION B MILLIVOLT PIN 1 to 2 TYPE J PIN 3 to 4 TYPE K amp TYPE T PIN 5 to 6 R amp TYPE S PIN 7 to 8 TYPE E PIN 9 to 10 THERMOCOUPLE BREAK ACTION UPSCALE PIN 11 to 12 DOWNSCALE PIN 13 to 14 77 EXAMPLE CONFIGURATION TYPE J THERMOCOUPLE UPSCALE TO ACTIVATE BREAK DETECTION JUMPER MUST BE PLACED BETWEEN THE INPUT AND L TERMINALS BOARD INTERCONNECTION THERMOCOUPLE THERMOCOUPLE TYPE BREAK ONE JUMPER ONE JUMPER DISASSEMBLY SEE NOTE 1 JUMPER CONFIGURATION SEE NOTE 1 Acromag NOTE 1 REFER TO THE CALIBRATION SECTION OF THE U R CO F G REFER TO HE CALIBRA
5. SA Type S Plat Plat 10 Rhod Span 550 to 1750 C Zero 0 to 12009C B ISA Type B Plat 6 Rhod Plat 30 Rhod Span 1000 to 1820 C Zero 0 to 10009C TC3 Thermocouple Narrow Span Custom Calibration Unit handles temperature equivalent millivolt spans from 3 to 5mV with the range factory calibrated to customer specifications NOTE The Thermocouple type and TC Break UP DOWN or NONE must also be specified The linearization option is not available or needed The following group of input types include the linearization circuit The standard span transmitter is linearized per the customer specified calibration range The range code xx in Input field below is used to represent the input range required Consult the Selection and Ordering Guide for standard range codes Custom range codes are also available consult the factory JLxx ISA Type J linearized KLxx ISA Type K linearized TLxx ISA Type T linearized ELxx ISA Type E linearized RLxx ISA Type R linearized SLxx ISA Type S linearized BLxx ISA Type B linearized Series 350T User s Manual Millivolt Thermocouple Isolation The input circuit is electrically isolated from the output and power circuits allowing the input to operate at up to 250V AC or 354V DC off ground on a continuous basis will withstand 1500V AC dielectric strength test for one minute without breakdown This complies with test requirements outlined in ANSI ISA S82 01 1988
6. TION SECTION O SERIES 35 T mV TC JUMPE NFIGURATION ater of ssor 1 1 4501 251 see ON a Se coop c 0 xp 24 NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 35 T HOUSING DIN RAIL MOUNT Pe BT re RAIL DIN MOUNTING SHOWN THIS SIDE 4 DIN EN 50035 32mm A 1 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 2 45 25 0 11 43 2 1 WIRE INSERTION CLAMPS 1 6 PLACES 1 t RAIL DIN MOUNTING SHOWN THIS SIDE 3 DIN EN 50022 35mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50035 32mm T RAIL DIN MOUNTING SHOWN HERE xh DIN EN 50022 35mm 6 79 0 1 55 39 4 SCREWDRIVER SLOT FOR 288 REMOVAL FROM RAIL NOTE ADJACENT UNITS CAN BE MOUNTED 73 41 ON 1 0 INCH 25 4mm CENTERS 3 35 5 85 09 3 55 90 17 ENCLOSURE DIMENSIONS FOR DIN RAIL MOUNTING eye Avgnes o er NOTE ALL TRANSMITTERS IN THIS CONFIGURATION SHARE OUTPUT COMMON CONNECTION WITH THE POWER SUPPLY L vou ve 5 C CURRENT Y NOTE THE COMBINATION OF A SERIES 550 TRANSMITTER AN AC POWERED SUPPLY PROVIDES THREE WAY ISOLATION SPAN demo INPUT OUTPUT AND POWER OUTPUT DC SUPPLY 12 5 to 36V DC POWER F GROUND CONSULT FACTORY INPUT INPU FOR SUPPLY OPTIONS 115V AC 230V INPUT INPUT SERIES 350 SERIES 350T SERIES 350 SERIES
7. V to 36 0V DC 9mA maximum Power Supply Effect DC Volts less than 0 001 of output span per volt DC for rated power supply variations 0 003 per volt for narrow span units 60 120 Hz ripple less than 0 01 of span per volt peak to peak of power supply ripple Series 350T User s Manual Millivolt Thermocouple Input Impedance A Millivolt and Thermocouple Inputs Without TC Break Detection 1 0M ohm at 1OmV span typical input current 10nA typical B Thermocouple Inputs Utilizing TC Break Detection 400K ohm at 10mV span input current 25nA typical 30nA maximum Thermocouple Models A Thermocouple Reference Junction Compensation standard on all thermocouple units and functional over the entire operating temperature range Includes unique circuitry to correct for reference junction non linearity over ambient temperature Reference Junction Compensation Ambient Temperature Effect 0 029C 9C typical B Thermocouple Break Detection user selectable for Upscale Downscale or None Up or downscale break detection is selectable via an internal jumper and activated via an external jumper Reference Test Conditions Input 0 10mV with a 100 ohm resistive source Output Y units 4 20mA DC 500 Ohm load Output Vx units 0 10V DC into 10K ohms or greater Ambient 779F 25 C 15V DC supply Accuracy Better than 0 1 of calibrated span or 0 01 mV whichever is greater This error in
8. be made per the Adjustment Procedure If the calibration of the unit is to be changed first go to the Shunt Block Configuration Procedure before going to the Transmitter Adjustment Procedure 1 Transmitter Shunt Block Configuration Procedure The Thermocouple transmitter is quite universal in that it can be configured for any of the standard Thermocouple types The Zero and Span adjustment range and the Thermocouple Break UP or DOWN can be configured Before the adjustment procedure can proceed the jumpers have to be configured to the requirements of the application refer to Drawing 4501 251 for details To gain access to the Configuration Jumpers first remove transmitter from the installation Second remove the circuit boards from the plastic enclosure as described in the Disassembly Procedure below Third configure jumpers shunt blocks as described in the Jumper Configuration procedure below NOTE calibration per the Adjustment Procedure should be performed before the circuit boards re reassembled within the plastic enclosure Series 350T User s Manual Millivolt Thermocouple Disassembly Procedure for the 350T Plastic Housing The plastic housing has no screws it snaps together A flat head screwdriver Acromag 5021 216 or equivalent is needed to pry the housing apart as described in the following steps CAUTION Do not push the screwdriver blade into the housing more than approximately 0 1 inches while pryin
9. cludes the combined effects of transmitter repeatability hysteresis terminal point linearity conformity instead of linearity for thermocouple inputs non linearized and adjustment resolution Does not include sensor error Linearization xLxx Option Optional linearized thermocouple units contain a five segment linearizer to correct for thermocouple non linearity This option offers low cost linearization and provides a minimum 10 to 1 improvement 0 1 in the linearity curve for the specified range of type J K T R S E and B ISA rated thermocouples Ambient Temperature Range 139F to 1859 259 to 85 C Ambient Temperature Effect Less than 0 01 of output span per OF 0 018 per C over the ambient temperature range for reference test conditions 0 025 of output span per 0 04590 per C for narrow span units at 5mV span Specification includes the combined effects of zero and span over temperature Bandwidth 3dB at 3 Hz typical Response Time For a step input the output reaches 9896 of output span in 300ms typical Noise Rejection Common Mode 130dB at 60 Hz 100 ohm unbalance typical Normal Mode 30dB at 60 Hz 100 ohm source typical Series 350T User s Manual Millivolt Thermocouple RFI Resistance Less than 0 5 of output span with RFI field strengths of up to 10V meter at frequencies of 27 151 and 467 MHz EMI Resistance Less than 0 25 of output span effect with swi
10. configurations Ripple and Noise Power supply ripple at 60Hz 120Hz is reduced at the load by the transmitter The ripple at the load will be less than 0 01 of span per volt peak to peak of power supply ripple Series 350T User s Manual Millivolt Thermocouple 2 Output Connect output per connection diagram refer to Drawing 4501 249 Load range is a function of the module s output type refer to Output in the preceding SPECIFICATIONS section The output shares a common with the power supply 3 Grounding The transmitter housing is plastic and does not require an earth ground connection 4 Input Connect input per connection diagram observe proper polarity see label for input type If unit is factory calibrated the calibration label indicates range of input NOTE The input circuit is electrically isolated from the output power circuit allowing the input to operate up to 250V AC or 354V DC off ground on a continuous basis If your input is a thermocouple the thermocouple break circuit will be activated by placing a short jumper wire between the input and L terminals of the transmitter The type of Break Detection UP or DOWN is configured internal to the transmitter see CALIBRATION Section CALIBRATION A TRANSMITTER This section provides information for configuration and calibration If the unit was factory calibrated jumpers have been placed in their proper positions and verification of the calibration can
11. dless of the mounting configuration employed the electrical connections are basically identical The wire size used to connect the unit to the control system is not critical All terminal strips can accommodate wire from 14 26 AWG Strip back the insulation 1 4 inch on each lead before installing it into the terminal block Input wiring may be either shielded or unshielded twisted pair Output wires should be twisted pair Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed It is recommended that the output and power wiring be separated from the signal wiring for safety as well as for low noise pickup Power Connect DC power supply per connection diagram refer to Drawing 4501 249 These transmitters operate from DC power supplies only Power supply voltage is not critical and normally should be from 10 0V to 36V DC The supply voltage must not exceed 36 Volts even instantaneously and must be adequate to furnish full scale current or voltage to the load Variations in power supply voltage above the minimum required or load resistance have negligible effect on transmitter accuracy Refer to POWER in the preceding SPECFICATIONS section for current requirements The minus power supply lead and the minus output lead share a common terminal This device includes input current limiting and reverse polarity protection Refer to Drawing 4501 254 for other power supply
12. during calibration move the Zero Shunt from IN Default Position to OUT If the span potentiometer range is found to be inadequate during calibration move the Span Shunt from IN Default Position to OUT Only move this jumper when it is required For Shunt Block location refer to Drawing 4501 251 The voltage representing the temperatures at Zero and at Full Scale are set on the millivolt source to obtain the two calibration points Use Table 2 to convert each temperature to its equivalent millivolts Reference 0 C for the thermocouple type used TABLE 2 Thermocouple Voltages vs Temperature Reference National Bureau of Standards Thermocouple Tables Thermoelectric Voltage in Millivolts Ref Junction at 0 C E R 5 Series 350T User s Manual Millivolt Thermocouple Transmitter Calibration Example MODEL 350T TC1 Y DIN NCR Input 100 to 400 C Type J Thermocouple TC Break Upscale Output 4 to 20mA DC NOTE To obtain the most accurate calibration of thermocouple transmitters apply power to the unit and allow several minutes for thermal stabilization before completing calibration 1 Set the input source to 5 268mV 100 C Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set the input source to 21 846mV 400 C Adjust the Span S pot until the output reads 20 000mA DC 3 Repeat st
13. eps 1 and 2 above until the readings converge The instrument is now calibrated Several mid point values should also be checked to verify proper operation of the transmitter Remember that the transmitter will be linear with millivolts and not temperature unless the transmitter includes a linearizer only then will it will be linear with temperature NOTE If a transmitter is linearized the transmitter can only be trimmed to the range specified on the label no other range of calibration will give acceptable results 4 After the above calibration procedure is complete install the transmitter PC Board assembly back into its case as described in the assembly procedure below Assembly Procedure for the 350T Plastic Housing NOTE The Model Serial Number label is attached to the left plastic side 1 Refer to drawing 4501 251 and line up the left plastic side with the board and terminal assembly Carefully but firmly press the pieces together 2 Before installing the right side place the mounting bracket unique to the mounting type you have around the pins at the back of the housing 3 Line up the right side of the housing with the assembly and carefully but firmly press the pieces together GENERAL MAINTENANCE The transmitter contains solid state components and requires no maintenance except for periodic cleaning and calibration verification When a failure is suspected a convenient method for identifying a faulty transmitter i
14. eters which are accessible from the front of the unit Transmitter is DIN rail mounted MODEL SERIES 350T Color coded with a white label Series 350T User s Manual Millivolt Thermocouple INPUT Millivolt and Thermocouple Input span and zero ranges are adjustable as specified below except for linearized thermocouples and special ranges which are factory calibrated per customer specifications Both the span and zero adjustment capability are covered in two ranges and are configured by internal jumpers on the circuit board The narrow span units MV3 amp TC3 are configured and calibrated per customer requirements 1 Millivolt Standard Span Span 5 to 55mV Zero 5 to 25mV MV2 Millivolt Wide Span Span 25 to 250mV Zero 25 to 125mV MV3 Millivolt Narrow Span Custom Calibration Unit handles millivolt spans from 3 to 5mV with the range factory calibrated to customer specifications Thermocouple Standard Span TC Types J R S and B Non linearized The TC Type is field selected via an Internal jumper J ISA Type J Iron Constantan Span 100 to 760 C Zero 100 to 450 C K ISA Type K Chromel Alumel Span 100 to 1200 C Zero 100 to 600 C T ISA Type T Copper Constantan Span 100 to 400 C Zero 150 to 3009 E ISA Type E Chromel Constantan Span 100 to 700 C Zero 100 to 350 C R ISA Type R Plat Plat 13 Rhod Span 550 to 17509C Zero 0 to 12009C S I
15. for the voltage rating specified OUTPUT Process Current or Voltage output The output shares a common with the power supply Voltage outputs are designed to provide true voltage output with zero volts included and to be stable with capacitive loads 4to 20mA DC see Load Resistance Range Equation below V0 0 to 10V DC into 10 000 ohms or greater V5 0 to 5V DC into 5 000 ohms or greater Load Resistance Range Equation Y output option The maximum load resistance for 20mA compliance is a function of input supply voltage as follows R Load Maximum Minimum VDC supply 2 5V 0 02 At 10 0V DC supply R Load 0 to 375 ohms At 12 5V DC supply R Load 0 to 500 ohms At 15 0V DC supply R Load 0 to 625 ohms At 24 0V DC supply R Load 0 to 1075 ohms Output Limiting Voltage units 150 of full scale output nominal Current units 125 of full scale output nominal Output Ripple Less than 0 1 of the maximum output span Power An external DC power supply is required between the output P and terminals Transmitter current is for rated supply inputs full scale output and no load on voltage output units Diode on transmitter provides reverse polarity protection CAUTION Do not exceed 36V DC peak to avoid damage to the transmitter A Process Current Output Y 10 0V to 36 0V DC 30mA 35mA at current limit B Voltage Output VO 12 5V to 36 0V DC 9mA maximum C Voltage Output V5 10 0
16. g it apart Handling of the printed circuit boards should only be done at a static free workstation otherwise damage to the electronics could result 1 To begin disassembly refer to Drawing 4501 251 place the screwdriver at point A left side of the transmitter While pressing the blade into the seam use a twisting motion to separate the sides slightly Repeat this operation at point B 2 Now that the two pieces have been partially separated use the screwdriver blade to work the left side of the package loose by working around the transmitter and carefully prying the sides further apart Repeat this action until it is easy to remove the left side from the plastic pins holding the pieces together 3 Repeat this operation for the right side starting at points C and D CAUTION If the two pc boards become separated while taking the package apart re align the boards making sure that the two headers pins and sockets at locations E and F are properly aligned and carefully push the boards back together Jumper Configuration Shunt Blocks Shunt blocks are provided to accommodate in field configuration changes In case of misplacement additional shunt blocks may be ordered from the factory When ordering additional shunt blocks refer to Acromag Part Number 1004 332 1 Thermocouple Input Determine the thermocouple type that you want to configure the transmitter for Refer to table on Drawing 4501 251 for proper jumper s
17. hunt position 2 Zero Span Range The Zero and Span shunt blocks should initially be placed in their default position IN for each case see Drawing 4501 251 During the process of Calibration the need to change these jumper positions will be determined Series 350T User s Manual Millivolt Thermocouple 3 Thermocouple Break Detection Determine whether Up Down or No 4 Break detection is required in your application refer to Drawing 4501 162 for proper jumper shunt position NOTE This break circuit is activated by a small jumper wire connected between the and L input terminals if TC break detection is not desired do NOT install the jumper On millivolt units this jumper wire is not installed NOTE For TC units it is important to calibrate the transmitter with the TC break configured per your requirements Changing the TC break configuration afterward will affect your calibration 5 Important Mark the Transmitter s Configuration on the calibration label located on the enclosure For Example IN Type J UP 100 to 400 C Jumper Configuration Example The following is the configuration for the example below configure as required by your application Configure internal jumpers as follows A Thermocouple Type Type J B Zero Span Range Zero amp Span Jumpers both IN C Thermocouple Break Set Upscale an external jumper is required between the input and L also to activate 2 Transmitte
18. llation Connect as shown in the connection diagram of Drawing 4501 249 If the unit is not factory calibrated refer to the CALIBRATION section Mounting Mount transmitter assembly refer to Drawing 4501 252 for mounting and clearance dimensions DIN Rail Mounting Using suitable fastening hardware secure the DIN rail to the designated mounting surface A transmitter can be mounted to either the T or G Rail Installation of the transmitter to the rail depends on the type of DIN rail used Units can be mounted side by side on 1 0 inch centers if required Series 350T User s Manual Millivolt Thermocouple Rail 35mm Type EN50022 To attach a transmitter to this style of DIN rail angle the top of the unit towards the rail and locate the top groove of the adapter over the upper lip of the rail Firmly push the unit towards the rail until it snaps solidly into place To remove a transmitter insert a screwdriver into the lower arm of the connector and pull downwards while applying outward pressure to the bottom of the unit G Rail 32mm Type EN50035 To attach a transmitter to this style of DIN rail angle the unit so that the upper groove of the adapter hooks under the top lip of the rail Firmly push the unit towards the rail until it snaps solidly into place To remove a transmitter pull the lower part of the unit outwards until it releases from the rail lift unit from rail Electrical Connections 1 Regar
19. r Adjustment Procedure The calibration example below is for a thermocouple input which requires an ice point temperature reference Calibration of millivolt units is similar but a reference is not required To simulate a thermocouple input an Acromag Series 320 Reference an ice bath or other suitable reference must be used Refer to Drawing 4501 250 Narrow span and linearized units are already factory calibrated for best performance Connect transmitter as shown in the connection diagram Drawing 4501 249 For best results the input signal source should be adjustable from 5mV to 80mV DC settable to an accuracy of 0 146 or better and have a source resistance of 100 ohms or less The power supply voltage must be greater than 12 5V DC at the terminals of the transmitter The output voltage must be measured to 0 1 accuracy or better for proper results The Zero and Span adjustments are accessible on the front panel of the transmitter see Drawing 4501 249 for their location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide For optimum performance the span and zero capability of the unit is covered in two ranges which are programmed by internal jumpers on the circuit board Series 350T User s Manual Millivolt Thermocouple The Span S and Zero Z jumpers change the range of adjustment of the span and zero potentiometers If the zero potentiometer range is found to be inadequate
20. s to exchange it with a known good unit It is highly recommended that a non functioning transmitter be returned to Acromag for repair since Acromag makes use of tested and burned in parts and in some cases parts that have been selected for characteristics beyond that specified by the manufacturer Further Acromag has automated test equipment that thoroughly checks the performance of each transmitter REVERSE POLARITY PROTECTION ZERO SPAN ADJUST ADJUST CURRENT o o LOW PASS SIGNAL OUTPUT VOLTAGE 0 5 FILTER AMPLIFIER AMPLIFIER CURRENT OUTPUT SIGNAL ISOLATION OPTIONAL GROUND OPTIONAL LINEARIZER TC UNITS INPUT POWER SUPPLY ISOLATION SERIES 35 T SIMPLIFIED SCHEMATIC mV TC INPUT ANSI STANDARD THERMOCOUPLE COLOR CODE MEASURING THERNOCOUPLE f wene constantan RED RED constantan RED _ _ BLACK PLATINUM RED s_ Puar r x Rhon suck PLATINUM RED E crower PURPLE constantan RED P sox RHOD PLAT ex RHOD RED L EXTENSION WIRE GROUND F GROUND THERMOCOUPLE MILLIVOLT SERIES 550 mV TC t INPUT CONNECTIONS ELECTRICAL CONNECTIONS pex ix rev oe ee PF 350 mV TC INPUT CONNECTIONS o ssor 11 88 4501 249 VOLTMETER mV SIGNAL SOURCE VOLTMETER mV SIGNAL SOURCE IRON WHITE FOR INTERNA
21. tandard range codes If the unit requires a custom range for the linearizer a 00 will be used and the unit s label will indicate the range Series 350T User s Manual Millivolt Thermocouple DESCRIPTION These DC powered transmitters condition millivolt or thermocouple input signals and convert the signal to a process current or voltage output Input circuit isolation is standard The unit also provides high input impedance thermocouple reference junction compensation upscale or downscale thermocouple break detection and wide range zero and span adjustments Optionally a five segment linearizer is available to correct for thermocouple non linearity over a customer specified calibration range The transmitters are RFI and EMI protected operate over large temperature ranges and feature excellent temperature coefficients which minimize effects from the harsh plant environment The 350T Series are DIN rail mounted transmitters designed to be used as functional components that provide the user with a modular approach to the varied applications in the field The Series 350T complements the Acromag Series 250T two wire transmitter line providing the same input conditioning for three wire applications That is Series 350T transmitters require a separate power supply connection while the output signal and DC power share a common lead The small package size low power requirements and wide supply range offers maximum flexibility to the sys
22. tching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations rated per ANSI IEEE C37 90 1978 Unit is tested to a standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction Printed Circuit Boards Military grade FR 4 epoxy glass circuit board Terminals Compression type wire size 14 AWG maximum Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black General Purpose NEMA Type enclosure Printed Circuit Board Coating Fungus resistant acrylic conformal coat Mounting Position Position insensitive MOUNTING DIN General Purpose Housing DIN Rail Mount G amp T rails G Rail 32mm Type EN50035 T Rail 35mm Type EN50022 Refer to Drawing 4501 252 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Association Factory Mutual etc approvals NCR No Certification Required INSTALLATION The transmitter is packaged in a general purpose type of enclosure Use an auxiliary enclosure to protect against unfavorable environments and locations Maximum operating ambient temperatures should be within 13 to 1859F 25 to 859C for satisfactory performance If the unit is factory calibrated it is ready for insta
23. tem designer As a three wired DC powered device it can also be used in critical applications that require the use of redundant supplies The Series 350T includes reverse polarity protection current limiting and operates from a single 10V to 36V DC supply In applications requiring only a single transmitter the 350T can use available DC power or it can be wired to an optional Series 35PS power supply module The Series 35PS power supply module receives it s power from either 115V AC or 230V AC Applications requiring multiple transmitters at a single location can more efficiently share a single DC supply The modular approach of this design and companion Acromag flat pack modules allows additional transmitters input modules isolators and alarms to be easily integrated as required See Drawing 4501 249 for a simplified Series 350T schematic Input wiring is inserted in the bottom of the unit while output and power wiring is inserted at the top of the unit Screws to secure the wiring are located on the front panel Connectors are screw clamp type and accept wire size up to 14 AWG SPECIFICATIONS Function This family of isolated DC Voltage powered transmitters condition either a millivolt or thermocouple signal have input circuit isolation and convert the input signal to a process current or voltage output The output and DC power share a common terminal 3 Wire connection Wide range zero and span adjustments utilize 22 turn potentiom
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