- 1 - User`s Manual: Series 250T DC Current/Voltage Two
Contents
1. User s Manual Series 250T DC Current Voltage Two Wire Transmitters Table of Contents Page 1 Description 1 Specifications 2 Specifications Display 3 ARON siiin 4 Calibration 4 General 6 List of Drawings Page Electrical Connections DC C V Input 4501 097 7 Configuration Jumper Location 4501 096 wes 8 Dimensions DIN Rail Mounting 4501 080 9 Dimensions Surface 8 Snaptrack Mtg 4501 081 10 Mechanical Assy Mounting XP Enclosures 4501 082 11 NEMA 4 8 12 Enclosures 4501 083 12 Explosion Proof Enclosure 4501 084 We 13 Explosion Proof Enclosure with Window 4501 085 14 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 the Buyer and Acromag that this is the Buyer s responsibility ACROMAG INCORPORATED 30765 South Wixom Road PO Box 437 Wixom MI 483932. 9 11 15 lt ENCLOSURE OPTION OPPS 25 __ 1 1 24501 5 G
3. 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 amp N12 OPTION ENCLOSURE DIMENSIONS _____ MICH ENCLOSURE N4 amp N12 OPTION 2507 1 1 94501 83 O RING GASKET FRONT FACE MOUNTING SCREWS 2 PLACES 6 32 THD 25 INCH SERIES 2597 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED 4 60 116 84 1 00 25 4 75 NPT 19 05 SERIES 2507 TRANSMITTER 2 PLACES ENCLOSURE TOM ENCLOSURE DIMENSIONS OPTION MICH 28 90 TW cur NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS mE ENCLOSURE XP OPTION 25 01 084 6 32 THD SERIES 2507 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 _____ 2 1 OUNTING SCREWS 2 PLACES O RING GASKET 0 25 INCH COVER GLASS WINDOW SHOWN WITH DISPLAY MODULE ENCLOSURE DIMENSIONS 9 75 NPT 19 05 0 8 2 PLACES O RING GASKET OPTION
4. 1 3 25 nor useos 1 2 1 3 2ser ve 1 2 1 3 SHORTING CLIP IS REQUIRED F BOARD INTERCONNECTION JUMPER CONFIGURATION SEE NOTE 1 DISASSEMBLY SEE NOTE 1 P 2221 5 WIXOM MICH 28 90 eve NOTE 1 REFER TO THE CALIBRATION SECTION OF THE SERIES 2501 CURRENT VOLTAGE JUMPER CONFIGURATION 515 401 696 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 0 45 25 0 11 43 1 2 1 WIRE INSERTION CLAMPS 6 PLACES 1 1 a 1 6 RAIL DIN MOUNTING RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE 3 DIN EN 50035 32mm DIN EN 50022 35mm RAIL DIN MOUNTING SHOWN HERE DIN EN 59035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm 3 11 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 90 17 SCREWDRIVER SLOT FOR REMOVAL FROM RAIL 5 6 4 Dare Rev enc ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING 01 OPTION NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 1 1 4501 080 B ral G H NOTE PLASTIC ENCLOSURE SNAPS NOTE PLASTIC ENCLOSURE SNA
5. Better than 0 1 of calibrated span 0 25mV whichever is greater The error includes the combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution Ambient Temperature Range 13 F to 185 F 259 to 85 C Ambient Temperature Effect Less than 0 01 of output span F 0 018 per C over the ambient temperature range for reference test conditions 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 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 1204 at 60 Hz 100 ohm unbalance typical Normal Mode 30dB at 60 Hz 100 ohm source typical Resistance Less than 0 5 of output span change with RFI field strengths of up to 10V meter at frequencies of 27MHz 151MHz 467MHz EMI Resistance Less than 0 25 of output span effect with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations are rated per ANSI IEEE C37 90 1978 Unit is tested
6. of Reed Devices Inc NEMA 4 and 12 Enclosures Option types listed below Refer to Drawing No 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 4 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 7Kg 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 Ship weight 6 pounds 2 7Kg packed 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 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 3Kg
7. packed XPD1 Explosion Proof Water Tight Enclosure With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7Kg packed XPD2 Explosion Proof Water Tight Enclosure With Window Includes the Temperature Display Option D2 Shipping weight 6 pounds 2 7Kg packed XPD3 Explosion Proof Water Tight Enclosure With Window Includes the Engineering Units Display Option D3 Shipping weight 6 pounds 2 7Kg 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 Temperature Display Option D2 Not applicable 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 xxD2 xxD3 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 Cha
8. to a standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Series 250T User s Manual DC Current Voltage Two Wire Transmitters 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 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 amp rails Rail 32mm EN50035 Rail 35mm Type EN50022 Refer to Drawing No 4501 080 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed SM General Purpose Housing Surface Mount Refer to Drawing No 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed ST General Purpose Housing SNAPTRACK Refer to Drawing No 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed SNAPTRACK is a registered trademark
9. 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 283 C94F009 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 C1 XP NCR C Mounting Certification Display NCR Approval Notes Table 1 1 Unit can be ordered with or without the factory calibration C option All other input types automatically include calibration to the customer s specification no C needed Any customer specified calibration info will be included on a separate calibration label on the unit 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION These two wire transmitters condition DC voltage either unipolar or bipolar from 100mV to 100V DC spans and convert the signal to a 4 to 20mA process current output Input circuit isolation is standard The unit also provides high input impedance voltage inputs and wide range zero and span adjustments The transmitters are RFl protected operate over large temperature ranges and feature excellent temperature coefficients which minimize
10. PS TOGETHER AT SEAMS TOGETHER AT SEAMS WIRE INSERTION SCREWDRIVER WIRE INSERTION LOCATION 2 PLACES LOCATION 2 PLACES MOVAL 2 89 gt 73 41 1 3 10 3 30 78 75 83 82 MTG SLOTS 148 3 756 WIDE 3 80 CLEAR 6 SCREWS 2 PLACES 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS ENCLOSURE DIMENSIONS AEN a SURFACE MOUNTING SNAPTRACK MOUNTING SM OPTION ST OPTION wien 29 AUG oo 136 60 Tow NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS me HOUSING 5 ST OPTION 28 2507 1e 1 501 081 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 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 D 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 UNI
11. T 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 349 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 DISPLAY 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 71 14 94 A 40007 TAV 28 98 Tour MICK TRANSMITTER DISPLAY ASSEMBLY 4501 082 SERIES 2501 TRANSMITTER SHOWN IN ENCLOSURE WITH COVER OPEN NOTE ROOM 15 AVAILABLE FOR A SECOND UNIT WITH THE SM SURFACE MOUNT OPTION ORDER SEPARATELY NOTE ALL DIMENSIONS ARE iN INCHES MILLIMETERS GROUND WIRE CONNECTION SEE NOTE 1
12. ation and convert the input signal to a 4 to 20mA process current output Wide range zero and span adjustments utilize 22 turn potentiometers accessible from the front of the unit The transmitter has various mounting and enclosure options available MODEL SERIES 250T Color Coded with a White Label INPUT DC Current and Voltage Input span and zero ranges are adjustable as specified below except for 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 C1 DC Current Span 4 0 to 20 0mA DC Zero 0 0 to 16 0mA DC Maximum full scale of 20 0mA DC Input load is 10 ohms V1 DC Voltage Span 0 1 to 1 0V DC Zero suppression from 0 to 25 percent of input span Input impedance is 40M ohms at 0 4V span typical input current 10nA typical V2 DC Voltage Span 1 0 to 10 0V DC Zero suppression from 0 to 25 percent of input span Input impedance is 100K ohms typical V3 DC Voltage Span 10 0 to 100 0V DC Zero suppression from 0 to 25 percent of input span Input impedance is 500K ohms typical V4 DC Voltage bipolar input Span 0 1 to 1 0V DC Signal is assumed to be symmetrical around 0 volts Input impedance is 80M ohms at 0 8V span typical input current 10nA typical V5 DC Voltage bipolar input Span 1 0 to 10 0 Signal is assumed to be symmetrical a
13. circuit boards are reassembled within the plastic enclosure Series 250T User s Manual DC Current Voltage Two Wire Transmitters Disassembly Procedure for the 250T Plastic Housing The plastic housing has no screws it snaps together A flat headscrewdriver Acromag 5021 216 or equivalent is needed to pry thehousing apart as described in the following steps CAUTION Do not push the 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 088 place the screwdriverat 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 2 Now that the two pieces have been partially separated use the screw driver blade to work the left side of the package loose by working around the transmitter and carefully prying the sides further part 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 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 align
14. e 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 the signal wiring for safety as well as for low noise pickup 1 Output Power Connect DC power supply and load per Connection Drawing 4501 097 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 Further 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 2 120 2 is reduced at the load by the transmitter The ripple at the load will be 0 01 of span per volt peak to peak of power supply ripple The unit may have up to 0 25 percent of internally generated ripple In this case connect an external 1uf capacitor across the load to reduce this ripple to less than 0 1 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 t
15. e Drawing 4501 097 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 5 and Zero 2 jumpers change the range of adjustment of the span and zero potentiometers If during calibration the zero potentiometer range is found to be inadequate move the Zero Shunt from IN Default Position to OUT If during calibration 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 096 Calibration Example 1 C1 V1 V2 and models are similar MODEL 250T V1 XPD1 NCR Input O to 1 0V DC Output 4 20 1 Set input source to 0 000 DC Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set input source to 1 000V DC 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 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 Note If the transm
16. ed 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 Zero Span Range The Zero and Span shunt blocks should initially be placed in their default position typically IN for each case see Drawing 4501 096 During the process of Calibration the need to change these jumper positions will be determined 2 Important Mark the Transmitter s Configuration on the calibration label located on the enclosure Example IN 1 0V DC Jumper Configuration Example Configure internal jumpers as follows Zero Span Range Zero 8 Span Jumpers both IN 2 Transmitter Adjustment Procedure Connect the transmitter as shown in Connection Drawing 4501 097 For best results the input signal source should be adjustable over the entire input range of the unit and settable to an accuracy of 0 1 or better and have a source resistance of 100 ohms 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 se
17. he right side of the housing with the assembly and carefully but firmly press the pieces together Series 250T User s Manual DC Current Voltage Two Wire Transmitters B DISPLAY Display Adjustment Procedure If the unit you are calibrating has a display it is calibrated separately from the transmitter However the calibration of the transmitter must be verified FIRST see above procedure before verifying the calibration of the display module Refer to Drawing 4501 097 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 fine trim adjustments only Display Calibration Example MODEL 250T V1 XPD1 NCR Input 0 to 1 0V DC Display 0 to 100 0 1 input source to 0 000V the Zero point of the transmitter s span Adjust the Zero DZ pot of the Display module for the zero of the display range 0 0 in this example 2 Set the input source to 1 000V DC 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 100 0 in this example 3 Repeat steps 1 and 2 until the readings converge The display is now calibrated GENERAL MAINTENANCE The transmitter contains solid state components and requires no maintenance except for peri
18. 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 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 Note It is recommended that the transmitter be removed from the enclosure during the process of drilling holes installing fittings and mounting the enclosure NEMA 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 the 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 transmitter has the display option make sure the orientation of the display allows for easy reading once installed Secure the transmitter assembly to the 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 befor
19. itter has the Display Option install it at this time also Calibration Example 2 V4 V5 and V6 models are similar MODEL 250T V4 XPD1 NCR Input 0 4 to 0 4V DC Output 4 20mA 1 Set the input source to 0 0000 DC Adjust the Zero Z pot until the output reads 12 000mA DC 2 Set the input source to 0 4000V DC Adjust the Span S pot until the output reads 4 000mA DC 3 Set the input source to 0 4000V DC Take note of how far the output is 20 000mA DC Adjust the Span S pot to reduce the difference from 20 000mA DC by half Adjust the Zero Z pot until the output reads 20 000mA DC 4 Repeat steps 2 and 3 until the readings converge The instrument is now calibrated Several mid point values should also be checked to verify proper operation of the transmitter 5 After the above calibration procedure is complete install the transmitter PC Board assembly back into its case as described in the 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 Number label is attached to the left side 1 Refer to Drawing 4501 096 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 t
20. n 13 OF 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 097 If the unit is not factory calibrated refer to the CALIBRATION section Mounting To mount the transmitter assembly determine which configuration is utilized and consult the proper mounting instructions below and refer to the appropriate outline drawing for mounting and clearance dimensions 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 either or G Rail Installation of the transmitter to the rail depends on the type of DIN rail used see Drawing 4501 080 Units can be mounted side by side on 1 0 inch centers if required Surface Mounting Secure the transmitter to the designated mounting surface using two 6 32 screws The mounting bracket has screw slots to facilitate mounting Units can be mounted side by side on 1 0 inch centers if required 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
21. odic cleaning and calibration verification When a failure is suspected a convenient method for identifying a faulty transmitter is 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 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 checks the performance of each transmitter OUTPUT CURRENT SENSE 40 200 OUTPUT OPTIONAL TRANSMITTER FILTER ADJUSTMENTS TYPICAL 5 BUILT IN RESISTOR 10 40 208 DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST Series 2501 ADJUSTMENTS VOLTAGE CURRENT VOLTAGE CURRENT INPUT ADJUSTMENTS DISPLAY OPTION ADJUSTMENTS MV VOLT L E CURRENT VOLTAGE TRANSMITTERS ELECTRICAL CONNECTIONS PROCESS CURRENT MILLIVOLT VOLT Acromag INPUT CONNECTIONS SOMOS 2501 C V INPUT CONNECTIONS 2507 toi 4501 097 ZERO AND SPAN JUMPER SELECTION SEE TALE 4 OUT ZERO JUMPER SPAN JUMPER EXAMPLE CONFIGURATION 5 ZERO JUMPER IN 5 to 6 SPAN JUMPER IN PIN 1 to 2 BOARD INTERCONNECTION TABLE 1 ZERO amp SPAN JUMPER POSITIONS a m 5 6 1 3 250 4 1 2
22. racteristics 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 C to 50 C 32 to 1229 Storage 20 C to 70 C 49 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 C 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 Association Factory Mutual etc approvals NCR No Certification Required Series 250T User s Manual DC Current Voltage Two Wire Transmitters INSTALLATION The transmitter is packaged in a general purpose plastic housing and optionally mounted within a variety of protective enclosures The transmitter should be located 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 withi
23. ransmitter 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 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 on a continuous basis CALIBRATION A TRANSMITTER This section provides information for unit configuration and calibration 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 Zero and Span adjustment ranges are configured by internal jumpers refer to Drawing 4501 096 for details To gain access to the configuration jumpers first remove the transmitter from the installation Second remove the circuit boards from the plastic enclosure as described in the Disassembly Procedure below Third configure the jumpers shunt blocks as described in the Jumper Configuration procedure below Note calibration per the Adjustment Procedure should be performed before the
24. round 0 volts Input impedance is 100K ohms typical V6 DC Voltage bipolar input Span 10 0 to 100 0V Signal is assumed to be symmetrical around 0 volts Input impedance is 500K ohms typical 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 A Test Signal of 40mV to 200mV is available at the output terminals see Drawing 4501 097 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 3 8mA DC to 26mA DC typical 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 span per volt DC 60 120 Hz ripple 0 01 of output span per volt peak to peak of power supply ripple Input Impedance Per input type see input description above Reference Test Conditions Input 1 to 5V DC 100 ohm resistive source output 4 20mA into a 500 ohm load 77 F 25 C 24V DC supply Accuracy
25. the effects from the plant environment Following the 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 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 SNAPTRACK plastic rail mounting or in various housings These housings include NEMA 4 12 and explosion proof enclosures The model number of the unit specifies the mounting enclosure type Series 250T User s Manual DC Current Voltage Two Wire Transmitters 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 or engineering units and 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 DC current or voltage signal provide input circuit isol
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