-1- User`s Manual: Series 250T Model 250T Millivolt
Contents
1. 4 User s Manual Series 250 Model 250T Millivolt Thermocouple Two Wire Transmitters Table of Contents Page he 1 Descriptio isiin 1 2 Specifications Display 4 Installation 4 Calibration 6 General Maintenance 2 7 List of Drawings Page Typical Installation amp Simplified Schematic 4501 077 8 Electrical Connections MV TC Input 4501 090 9 Calibration Connections MV TC Input 4501 091 10 Configuration Jumper Location 4501 092 11 Dimensions DIN Rail Mounting 4501 080 ae 12 Dimensions Surface Snaptrack Mtg 4501 081 13 Mechanical Assembly Mounting XP Enclosures 4501 82 14 NEMA 4 12 Enclosures 4501 083 15 Explosion Proof Enclosure 4501 084 16 Explosion Proof Enclosure with Window 4501 085 17 IMPORTANT SAFETY CONSIDERATIONS 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 the2. 0 75 inch Quantity 2 Housing meets Class Groups amp D Class Groups F G Class and NEMA 4 water tight requirements Transmitter is mounted within enclosure at factory XP Explosion Proof Water Tight Enclosure No Window Shipping weight 5 pounds 2 3 Kg packed XPD1 Explosion Proof Water Tight Enclosure With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7 Kg packed XPD2 Explosion Proof Water Tight Enclosure With Window Includes the Temperature Display Option D2 Shipping weight 6 pounds 2 7 Kg packed XPD3 Explosion Proof Water Tight Enclosure With Window Includes the Engineering Units Display Option D3 Shipping weight 6 pounds 2 7 Kg packed DISPLAY OPTION The Display is available as an option when specifying the XP Housing The linear display option assembly includes zero and span trim adjustments Display Options include xxD1 Standard Display Option D1 The minimum and maximum input any calibration is represented by 00 0 and 100 0 on the display normalized It also represents the 4 to 20mA transmitter output a resolution of 0 1 of span xxD2 Temperature Display Option D2 The minimum and maximum display readings correspond to the minimum and maximum temperature input range specified for the unit by the customer either in degrees C or F Requires the linearization option TC Units to be linear with tempe
3. CALIBRATION CONNECTIONS 297 a 24501 91 D E H __ ZERO 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 TYPE MILLIVOLT PIN 1 to 2 TYPE J 3 to 4 TYPE amp T PIN 5 to 6 R amp 7 to 8 TYPE PIN 9 to 10 THERMOCOUPLE BREAK ACTION UPSCALE PIN 11 to 12 DOWNSCALE PIN 13 to 1 EXAMPLE CONFIGURATION TYPE J THERMOCOUPLE UPSCALE JUMPER MUST BE PLACED BETWEEN H THE INPUT L TERMINALS THERMOCOUPLE THERMOCOUPLE TYPE BREAK ONE JUMPER ONE JUMPER DISASSEMBLY SEE NOTE 1 JUMPER CONFIGURATION SEE NOTE 1 NOTE 1 REFER TO THE SECTION OF THE SERIES 250 mV TC JUMPER CONFIGURATION 9 MANUAL FOR DETAILED INSTRUCTIONS ME 2541 mV TC JUMPER CONFIGURATION 2507 1e 14501 092 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 2 45 25 0 11 43 i 2 WIRE INSERTION CLAMPS 6 PLACES RAIL DIN MOUNTING RAI
4. include NEMA 4 12 and explosion proof enclosures The model number of the unit specifies the mounting enclosure type The transmitter mounted in the explosion proof enclosure is available with a 3 1 2 digit LCD readout 1 2 inch height to provide a visual indication of the transmitter s output The readout is available in percent of span temperature or engineering units and is scaled to customer requirements Input wiring is inserted in the bottom of the unit while output wiring is inserted in 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 two wire transmitters condition either a millivolt or thermocouple signal provide input circuit isolation and convert the input signal to a 4 to 20mA process current output Wide range zero and span adjustments utilize 22 turn potentiometers which are accessible from the front of the unit The transmitter also has various mounting and enclosure options available MODEL SERIES 250T 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
5. volt peak to peak of power supply ripple The unit has about 0 25 percent of internally generated ripple connect an external luf capacitor across the load to reduce this ripple to less than 0 1 percent if desired 2 Grounding The two wire transmitter is packaged in a General Purpose plastic housing and does not require an earth ground connection If the Two Wire Transmitter is mounted in a metal housing a ground wire connection is required Connect the ground terminal Green Screw to a suitable earth ground using suitable wire per applicable codes 3 Input Connect input per connection diagram observe polarity see label for input type If unit is factory calibrated 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 ona 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 on the transmitter The type of Break Detection UP or DOWN is configured internal to the transmitter see CALIBRATION 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 CALIBRATION A TRANSMITTER This section provides information for unit configuration and calib
6. 0 25 of output span effect with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations rated per ANSI IEEE C37 90 1978 Unit is tested a standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction Basic Transmitter Circuit Boards Military grade FR 4 epoxy glass circuit board Circuit Board Coating Fungus resistant acrylic conformal coat Terminals Compression type wire size 14 AWG maximum Mounting Position Position insensitive Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black General Purpose NEMA Type 1 enclosure MOUNTING DISPLAY A wide variety of mounting options and enclosures are available to meet the needs of the installation The available models are listed below The transmitter is shipped as a complete assembly General Purpose Housing Available with various mounting options listed below Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black DIN General Purpose Housing DIN Rail Mount 8 rails Rail 32mm EN50035 Rail 35mm EN50022 Refer to Drawing 4501 080 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed General Purpose Housing Surface Mount Refer to Drawing 4501 081 for outline and clearance dimensions Shipping W
7. 91 4501 081 2501 TRANSMITTER ASSEMBLY FOR ENCLOSURES NOTE TO REMOVE TRANSMITTER FROM DISPLAY ASSEMBLY PROCEED AS FOLLOWS A REMOVE SCREWS ITEM A 2 PLACES PULL DISPLAY ASSEMBLY AND DISPLAY MTG BRACKET 8 FROM TRANSMITTER A SIX PIN CONNECTOR WILL DISCONNECT FROM TRANSMITTER FOR ACCESS TO INTERNAL CONFIGURATION JUMPERS TAKE PLASTIC ENCLOSURE APART AT SEAMS USING A FLAT BLADE SCREWDRIVER 0 MOUNTING BRACKET ITEM IS HELD IN PLACE BY THE TWO HALVES OF THE PLASTIC ENCLOSURE OUTPUT Series 2587 TRANSMITTER ASSEMBLY WITH DISPLAY ASSEMBLY MOUNTED DISPLAY ASSEMBLY REMOVED DISPLAY ASSEMBLY SHOWN PARTIALLY REMOVED FROM TRANSMITTER DISPLAY ASSEMBLY COMPONENT PARTS A FACTORY UNIT ASSEMBLY BLACK PLASTIC DISPLAY TRANSMITTER ASSEMBLY a ENCLOSURE REMQVAL NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS OUTPUT TERMINALS DISPLAY ELECTRICAL CONNECTION NOTE DO NOT REMOVE BLACK SCREWS 2 PLACES DISPLAY ASSEMBLY TO TRANSMITTER 6 HOLES SCREW 6 20 PAN HEAD REMOVAL DISPLAY ASSEMBLY CONNECTION PINS STEEL THREAD CUTTING SHOWN EXTRACTED FROM PART 1010 5349 TRANSMITTER 6 PINS ALUMINUM DISPLAY 2 PLACES MTG BRACKET SCREW 2 PLACES OUTPUT 6 32 THD 0 25 INCH 5 DISPLAY OUTPUT CIRCUIT TERMINALS ASSEMBLY DISPLAY ELECTRICAL CONNECTIONS MOUNTING DIS
8. Buyer and Acromag that this is the Buyer s responsibility ACROMAG INCORPORATED 30765 South Wixom Road PO Box 437 Wixom MI 48393 7037 USA Tel 248 624 1541 FAX 248 624 9234 Copyright 1991 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 282 096 007 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 250T Input Mounting Display Certification Calibration B Typical Model Number 250T MV1 XP NCR C Series Mig Display NCR Approval Notes Table 1 1 The MV1 MV2 and TC1 can be ordered with or without the factory calibration C option All other input types except custom linearizer ranges automatically include calibration to the customer s specification C needed Any customer specified calibration information will be included on a separate calibration label on the unit For thermocouple units TC type input calibration and TC Break Detection UP DOWN or NONE must be specified 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals 3 Range Code Number Standard range code will have a number 01 12 etc Consult the selection and ordering guide for standard range codes If the unit requ
9. Input Determine the thermocouple type that you want to configure the transmitter for Refer to table on Drawing 4501 092 for proper jumper shunt 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 092 During the process of Calibration the need to change these jumper positions will be determined 3 Thermocouple Break Detection Determine whether Up Down or No Break detection is required in your application refer to the table on Drawing 4501 092 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 isn t 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 4 Important Mark the Transmitter s Configuration on the calibration label located on the enclosure 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 Zero Span Range Zero 8 Span Jumpers both IN C Thermocouple Break Upscale Requires jumper bet
10. L DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE 3 DIN EN 50035 32mm DIN EN 50022 35mm RAIL DIN MOUNTING SHOWN HERE Pp DIN EN 50035 32mm T RAIL DIN MOUNTING SHOWN HERE sui DIN EN 50922 35mm 79 0 1 55 1 55 4 39 4 39 4 NOTE ADJACENT UNITS CAN MOUNTED 2 89 ON 1 0 INCH 25 4mm CENTERS 73 41 3 35 85 09 3 55 96 17 SCREWDRIVER SLOT FOR REMOVAL FROM RAIL 5 6 4 Dare Rev ECN j or enc ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING OPTION NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS S 1 1 9 45 1 08 J NOTE PLASTIC ENCLOSURE SNAPS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS TOGETHER AT SEAMS WIRE INSERTION SCREWDRIVER WIRE INSERTION LOCATION 2 PLACES REOT EOR LOCATION 2 PLACES 2 89 75 41 1 3 10 3 50 78 75 83 82 SLOTS 0 148 3 756 WIDE 3 80 TO CLEAR 6 SCREWS 2 PLACES 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS ENCLOSURE DIMENSIONS SURFACE MOUNTING SNAPTRACK MOUNTING SM OPTION 5 OPTION SRE a uien S 29 90 eno ALL DIMENSIONS ARE IN INCHES MILLIMETERS HOUSING 5 OPTION 2 2971 1
11. Option Optional linearized thermocouple units contain a 5 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 13 F to 185 F 25 C to 85 C Ambient Temperature Effect Less than 0 01 of output span per 0 018 per C over the ambient temperature range for reference test conditions 0 025 of output span per OF 0 045 per C for narrow span units at 5mV span Specification includes the combined effects of zero and span over temperature Load Resistance Effect Less than 0 005 of output span for 100 ohm change Output Ripple Less than 0 25 of the maximum output span Can be reduced to less than 0 1 by adding a 1uF capacitor across the load resistor Some loads such as E P and I P devices may require a 0 1uF capacitor to be inserted across the load Bandwidth at 3 Hz typical Response Time For a step input the output reaches 98 of output span in 300ms typical Noise Rejection Common Mode 130dB at 60 Hz 100 ohm unbalance typical Normal Mode 0 at 60 Hz 100 ohm source typical RFI Resistance Less than 0 5 of output span with RFI field strengths of up to 10V meter at frequencies of 27mhz 151MHz and 467 MHz EMI Resistance Less than
12. PLAY TRANSMITTER To ELECTRICAL CONNECTIONS BRACKET TRANSMITTER 6 PINS DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST DISPLAY ASSEMBLY SHOWN ASSEMBLED TO TRANSMITTER AND SECURED BY TWO SCREWS ITEM A INPUT TERMINALS TRANSMITTER ASSEMBLY WITH 14 40007 TAV 28 AUG 98 fee Tour MICK TRANSMITTER DISPLAY ASSEMBLY ie SERIES 250 TRANSMITTER SHOWN IN ENCLOSURE WITH COVER OPEN NOTE ROOM 15 AVAILABLE FOR A SECOND UNIT WITH THE 5 SURFACE MOUNT OPTION ORDER SEPARATELY NOTE ALL DIMENSIONS ARE iN INCHES MILLIMETERS GROUND WIRE CONNECTION SEE NOTE 1 NOTES 1 THESE SPECIFIC CLAMPS ON NEMA 4 ENCLOSURES ONLY CONDUIT MOUNTING HOLES AND FITTINGS ARE CUSTOMER SUPPLIED 0 313 7 9 DIA HOLE 4 PLACES 4 N12 OPTION ENCLOSURE DIMENSIONS MICH Trav or ME ENCLOSURE 4 amp 12 OPTION 250T 1 1 94501 83 O RING GASKET MOUNTING SCREWS 2 PLACES 6 32 THD 9 25 INCH SERIES 250 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED 4 60 116 84 1 09 25 4 9 75 19 05 SE
13. RIES 2507 TRANSMITTER 2 PLACES ENCLOSURE ENCLOSURE DIMENSIONS OPTION MICH 98 90 TW kG cur NOTE ALL DIMENSIONS IN INCHES MILLIMETERS mE ENCLOSURE XP OPTION 25 re 1854591284 6 52 THD SERIES 250 TRANSMITTER WITH DISPLAY OPTION SHOWN IN ENCLOSURE WITH COVER REMOVED SERIES 2501 TRANSMITTER WITH DISPLAY OPTION SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS A OUNTING SCREWS 2 PLACES O RING GASKET 0 25 INCH COVER GLASS WINDOW SHOWN WITH DISPLAY MODULE ENCLOSURE DIMENSIONS 0 75 19 05 0 8 2 PLACES O RING GASKET OPTION 9 pare lt ENCLOSURE OPTION OPPS 25 __ 1 3 54501 085
14. YPICAL BUILT IN RESISTOR 18 OHMS 40 209 4 20 DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST Series 2501 CES ADJUSTMENTS 2006 MV TC INPUT MEASURING THERMOCOUPLE TYPE J TYPICAL DISPLAY OPTION ADJUSTMENTS OPTIONAL TC BREAK lt lt DETECTION MILLIVOLT THERMOCOUPLE TRANSMITTER ELECTRICAL CONNECTIONS 1 L WIRE 4 THERMOCOUPLE MILLIVOLT Acromag INPUT CONNECTIONS MICH 2507 MV TC INPUT CONNECTIONS asor iwi 4501 099 H VOLTMETER POWER SUPPLY SIGNAL SOURCE 5 DIGIT IRON WHITE RLOAD FOR INTERNAL TRANSMITTER CONFIGURATION JUMPERS SEE DRAWING 4501 092 V DC SUPPLY V TRANSMITTER V LOAD 12V VTRANS MIN 5V 20 mA X 250 OHMS CONSTANTAN RED TRANSMITTER 17V DC MINIMUM COPPER ADJUSTMENTS WIRES THERMOCOUPLE EXTENSION WIRE TYPICAL 250 TRANSMITTER OL NOTE EITHER OF THESE werent CIRCUITS MAY BE USED TO CALIBRATE THERMOCOUPLE INPUTS mV SIGNAL SOURCE OPTIONAL 6 JUMPER INSTALLED IRON SERIES 320 THERMOCOUPLE REFERENCE FOR IRON COSTANTAN CONSTANTAN 5 5 REFERENCE MUST MATCH TC TYPE USED 115V AC 6 6 THERMOCOUPLE CALIBRATION CONNECTIONS Acromag 25 T mV TC
15. at the mounting bracket has screw slots to facilitate mounting Units can be mounted side by side on 1 0 inch centers if required 3 SNAPTRACK Mounting Secure the SNAPTRACK mounting channel to the designated mounting surface using suitable fastening hardware To install the unit in the mounting channel place the bottom end of the mounting bracket between the rails and press the top notched end firmly until the bracket snaps into place To remove the transmitter insert a screwdriver into the upper arm of the connector and twist to release the unit from the track and tip the unit out Units can be mounted side by side on 1 0 inch centers if required Series 2507 User s Manual Millivolt Thermocouple 4 NEMA 4 amp 12 Enclosure Mounting Secure the enclosure assembly to the designated mounting surface using appropriate hardware The transmitter is secured within this enclosure using two screws 5 Explosion Proof Mounting Secure the enclosure assembly to the designated mounting position using appropriate hardware Note It is recommended that the transmitter be removed from the enclosure during the process of mounting the enclosure To remove the unit from the enclosure remove two screws securing it to the bottom of the enclosure After the enclosure is installed install the transmitter into the enclosure Position the unit at an angle that permits all wiring to be routed unobstructed through both ports If the transmi
16. ation Factory Mutual etc approvals NCR No Certification Required INSTALLATION The transmitter is packaged in a general purpose plastic housing an optionally mounted within a variety of protective enclosures The transmitter should be in an area that is protected from dust moisture and corrosive atmospheres The enclosure type determines the protection afforded in a particular environment and location make sure that this is not compromised Maximum operating ambient temperatures should be within 13 to 185 F 25 C to 85 C for satisfactory performance If the unit is factory calibrated it is ready for installation Connect as shown in Connection Drawing 4501 090 If the unit is not factory calibrated refer to the CALIBRATION section Mounting Mount transmitter assembly refer to appropriate outline drawing for mounting and clearance dimensions Determine which configuration is utilized and consult the proper mounting instructions listed below 1 DIN Rail Mounting Use suitable fastening hardware to secure the DIN rail to the designated mounting surface A transmitter ordered with the DIN Rail mounting option DIN can be mounted to T 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 2 Surface Mounting Secure the transmitter to the designated mounting surface using two 6 32 screws Note th
17. e Standard Span transmitter is linearized per the customer specified calibration range The range code xx in 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 factory JLxx ISA Type J linearized KLxx ISA Type K linearized TLxx ISA Type T linearized ELxx ISA Type E linearized RLxx ISA Type linearized SLxx ISA Type 5 linearized BLxx ISA Type B linearized Isolation The input circuit is electrically isolated from output 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 Complies with test requirements outlined in ANSI C39 5 1974 for the voltage rating specified Output 4 20mA DC output Note Test Signal 40mV to 200mV is available at the output terminals see Drawing 4501 090 it represents the 4 to 20mA output Power An external loop power supply is required 12V DC minimum 50V DC maximum Under no circumstances must the DC supply ever exceed 75 volts peak instantaneously Unit has reverse polarity protection Output Limits typical 3 8mA to 26mA Load Resistance Range Equation R Load Maximum V supply 12V 20 At 24V supply R Load 0 to 600 ohms Power Supply Effect DC Volts 0 001 of output spa
18. e screwdriver blade into the housing more than approximately 0 1 inches while prying 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 begin disassembly refer to Drawing 4501 092 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 right side starting at points C and D Series 250T User s Manual Millivolt Thermocouple 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
19. eight 1 pound 0 45 Kg packed ST General Purpose Housing Refer to Drawing 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed TM SNAPTRACK is a registered trademark of Reed Devices Inc NEMA 4 and 12 Enclosures Option types listed below Refer to Drawing 4501 083 for outline and clearance dimensions Transmitter is mounted within the enclosure at the factory These enclosures can also accommodate a second Series 250T transmitter with the surface mount option option ordered separately Conduit mounting holes and fittings are customer supplied N4 Water Tight Enclosure NEMA 4 Enclosure material and finish 0 075 and 0 060 inch thick steel with gray hammertone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed N12 Oil Tight Enclosure NEMA 12 Enclosure material and finish 0 075 and 0 060 inch thick steel with gray hammertone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed Series 2507 User s Manual Millivolt Thermocouple Explosion Proof Water Tight Enclosures Option types listed below Refer to Drawing 4501 084 no display window or Drawing 4501 085 with display window for outline and clearance dimensions Enclosure Materials Body and cover Copper free aluminum less than 0 4 Glass lens Heat tempered glass Gasket Neoprene Finish Corro free epoxy powder coat color gray Hub size
20. erification When a failure is suspected a convenient method for identifying a faulty transmitter is to exchange it with a known good unit Itis highly recommended that a non functioning transmitter be returned to Acromag for repair since Acromag used 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 TWO WIRE TRANSMITTER SERIES 250 FIELD ROOM OPTIONAL TYPICAL INSTALLATION SERIES 2501 PESER REVERSE TEST SIGNAL 40 200 ZERO SPAN 1 OHMS 0 200 ADJ 9 LOWPASS OUTPUT FILTER SIGNAL AMPLIFIER 4 20 AMPLIFIER 1 4 OPTIONAL F OPTIONAL ORTONA GROUND OPTIONAL LINEARIZER TC UNITS DISPLAY TRIM POWER SUPPLY POWER ISOLATION SIMPLIFIED SCHEMATIC SERIES 2501 Actomag rev enc E INSTALLATION TYPICAL INSTALLATION 2507 4501 9077 H RON constantan RED output constantan RED _ _ BLACK PLATINUM SUPPLY OUTPUT LAT 10 RHOD BLACK PLATINUM E CHROMEL CONSTANTAN RED PLAT 30x RHOD PLAT 6 RHOD RED OPTIONAL TRANSMITTER FILTER ADJUSTMENTS 1uF T
21. ibration if the zero potentiometer range is found to be inadequate move the Zero Shunt from IN Default Position to OUT If the span potentiometer range is found to be inadequate move the Span Shunt from IN Default Position to OUT Only move the Shunt Jumpers when it is required For Shunt Block location refer to Drawing 4501 092 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 on the following page to convert each temperature to its equivalent millivolts Reference 0 C for the thermocouple type used Transmitter Calibration Example MODEL 250T TC1 XPD1 NCR Input 100 to 400 C Type J Thermocouple TC Break Upscale Output 4 20 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 steps 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 incl
22. ires a custom range for the linearizer a 00 will be used the unit s label will indicate the range DESCRIPTION These two wire transmitters condition millivolt or thermocouple input signals and convert the signal to a 4 to 20mA process current 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 5 segment linearizer is available to correct for thermocouple non linearity over a customer specified calibration range These transmitters are RFl protected operate over a wide temperature range and feature excellent temperature coefficients which minimize the effects of harsh plant environments Series 250T User s Manual Millivolt Thermocouple Following basic two wire design the output and the DC power share the same pair of twisted copper wires The transmitter acting similar to a variable resistor in series with the load and the DC supply provides an output loop current proportional to the input sensor signal See Drawing 4501 077 for a typical installation These field mounted two wire transmitters are designed to utilize one of a number of customer specified mounting configurations The transmitter is available for DIN rail mounting surface mounting 3 inch plastic mounting or in various housings These housings
23. n per volt DC 60 120 Hz ripple 0 01 of output span per volt peak to peak of power supply ripple Series 250T User s Manual Millivolt Thermocouple Input Impedance A Millivolt and Thermocouple Inputs Without TC Break Detection 1 0M ohm at 10mV 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 02 C C typical B Thermocouple break detection Upscale downscale or none user selectable Upscale or downscale break detection is selectable via an internal jumper It is activated via an external jumper Reference Test Conditions Input 0 10mV with a 100 ohm resistive source output 4 20mA into a 500 ohm load 77 F 25 C 24V DC supply Accuracy 0 1 of calibrated span or 0 01 mV whichever is greater The error includes 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
24. nt Procedure If the unit you are calibrating has a display it is calibrated separately from the transmitter The calibration of the transmitter must be verified FIRST see above procedure before verifying the calibration of the display module Refer to Drawing 4501 090 for location of Transmitter s Zero and Span adjustments and the location of the Display s Zero and Span adjustments NOTE The display option is factory configured for a particular customer specified range the Zero DZ and Span DS adjustments are trim adjustments only Display Calibration Example MODEL 250T TC1 XPD2 NCR Input 100 to 400 C Type J Thermocouple Iron Constantan Display 100 to 400 C 1 Set the millivolt input to 5 268mV 100 C the Zero point of the transmitter s span Adjust the Zero DZ pot of the Display module for the zero of the display range not necessarily the same as the transmitter s range 100 C in this example 2 Set the millivolt input 21 846mV 400 C the full scale point of the transmitter s span Adjust the Span DS pot on the Display module for the correct full scale display reading not necessarily the same as the transmitter s range 400 C in this example 3 Repeat steps 1 2 above until the readings converge The display is now calibrated GENERAL MAINTENANCE The transmitter contains solid state components and requires no maintenance except for periodic cleaning and calibration v
25. ration If the unit was factory calibrated jumpers have been placed in their proper positions and verification of the calibration can 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 092 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 are reassembled within the plastic enclosure Disassembly Procedure for the 250T 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 th
26. rature otherwise it will be linear with the thermocouple equivalent millivolts xxD3 Engineering Units Display Option D3 The minimum and maximum display readings correspond to the minimum and maximum display readings specified for the unit by the customer Display Range The minimum display reading can be from 1999 to 1999 counts while the span range can be from 100 to 2000 counts span counts maximum counts minus minimum counts Note mentally remove the decimal point to determine the display counts The decimal point is configured as required such as 00 0 to 100 0 Display Characteristics The 7 segment reflective Liquid Crystal Display LCD contains 3 1 2 digits 1999 with 1 2 inch character height Also includes a factory programmed 3 position decimal point Optimal view angle is 60 degrees No Output Burden Provides a visual indication of the transmitter output without reducing the output compliance the allowable load resistance range Display Ambient Temperature Range Operating 0 to 50 C 32 to 122 F Storage 20 to 70 C 4 to 158 F Over range The three lower order digits blank for gt 1999 counts Display Accuracy 0 1 of reading 2 counts Display Ambient Temperature Effect 0 02 per 0 012 per typical Conversion Rate 2 5 per second CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Associ
27. tter has the display option make sure the orientation of the display allows for easy reading once installed Secure the transmitter assembly to enclosure using two screws Electrical Connections 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 wire insulation 1 4 inch on each lead before installing into the terminal block Input wiring may be 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 output power wiring be separated from signal wiring for safety as well as for low noise pickup 1 Output Power Connect DC power supply and load Connection Drawing 4501 090 These transmitters operate from DC power supplies only Power supply voltage is not critical and normally should be from 12 50V DC The supply voltage must not exceed 75 volts even instantaneously The power supply voltage must be adequate to furnish full scale current to the load s plus transmission line drop plus 12V DC terminal voltage to the transmitter Variations in power supply voltage or load resistance have negligible effect on transmitter accuracy Ripple and Noise Power supply ripple at 60 2 120 2 is reduced at the load by the transmitter The ripple at the load will be 0 01 of span per
28. udes 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 nthe assembly procedure below Note If the transmitter has the Display Option install it at this time also Assembly Procedure for the 250T Plastic Housing NOTE The Model Serial label is attached to the left plastic side 1 Refer to Drawing 4501 092 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 Series 250T User s Manual Millivolt Thermocouple TABLE 2 Thermocouple Voltages vs Temperature Reference National Bureau of Standards Thermocouple Tables Thermoelectric Voltage In Millivolts With Reference Junction at 0 C TEMP C K T E R 5 DISPLAY Display Adjustme
29. ween the and L input terminals too 2 Transmitter 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 091 Narrow span and linearized units are factory calibrated for best performance Connect the transmitter as shown in the Connection Drawing 4501 091 For best results the input signal source should be adjustable from 5mV to 80 DC settable to an accuracy of 0 1 or better and have a source resistance of 100Q or less The power supply voltage must be adequate to furnish full scale current to the load plus wire drop plus 12V DC terminal voltage to the transmitter The output current 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 091 for 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 are covered in two ranges which are programmed by internal jumpers on the circuit board The Span S and Zero Z jumpers change the range of adjustment of the span and zero potentiometers During cal
30. xx3 are configured and calibrated to customer calibration requirements MV1 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 to 5 with the range factory calibrated to customer specifications TC1 Thermocouple Standard Span TC Types J K T E R S and B Non linearized The TC Type is field selected via an internal jumper J ISA Type J lron Constantan Span 100 to 760 C Zero 100 to 450 C 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 350 C E ISA Type E Chromel Constantan Span 100 to 700 C Zero 100 to 350 C ISA Type Plat Plat 13 Rhod Span 550 to 1750 C Zero 0 to 1200 C 5 ISA Type 5 Plat Plat 10 Rhod Span 550 to 1750 C Zero 0 to 1200 C B ISA Type B Plat 6 Rhod Plat 30 Rhod Span 1000 to 1820 C Zero 0 to 1000 C TC3 Thermocouple Narrow Span Custom Calibration Unit handles temperature equivalent millivolt spans from 3 to 5 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 Th
Download Pdf Manuals
Related Search