User`s Manual: Series 250T AC Voltage Input Two
Contents
1. MOUNTING SCREWS 2 PLACES 6 20 THD 0 313 INCH 3 SERIES 2591 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED SERIES 250 TRANSMITTER WITH DISPLAY OPTION SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 4 875 123 83 1 009 25 40 1 000 25 40 ENCLOSURE DIMENSIONS 4 OPTION a ee E DIMPLE PROVIDED FOR DRILLING A 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE 6 75 19 0 NPT 2 PLACES MICH TE ENCLOSURE 4 OPTION o 1 1 4501 087 H sas Acromag 2 2a sal Tav Ke TKS 0 rev O RING GASKET FRONT FACE 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 00 25 4 75 NPT 19 05 SERIES 2507 TRANSMITTER 2 PLACES ENCLOSURE TOM ENCLOSURE DIMENSIONS OPTION MICH 28 AUG 90 TW ke Tene ice NOTE ALL DIMENSIONS IN INCHES MILLIMETERS ENCLOSURE XP OPTION 2 25 re 1854591284 GL 6 32 THD SERIES 250 TRANSMITTER WITH DISPLAY OPTION2. DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST Series 2507 AC VOLTAGE INPUT Sy SERIES 250 DISPLAY OPTION SERIES 250 AC VOLTAGE INPUT ELECTRICAL CONNECTIONS WIXOM 7 93 BC enc cup T SERIES 2501 VAC INPUT CONNECTIONS OUTPUT CURRENT SENSE 1uF TYPICAL NOTE 10 OHM SERIES RESISTOR IS BUILT IN 9 1 25ppm MEASUREMENT RANGE 15 40 200mV 4 20mA AC VOLTAGE INPUT AC VOLTAGE L p 2507 11 4581 371 8 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 9 45 25 9 11 43 2 WIRE INSERTION CLAMPS 6 PLACES l 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 ry geome DIN EN 50035 32mm T RAIL DIN MOUNTING SHOWN HERE DIN 50022 35mm 79 9 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 Dare Rev ECN enc ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING OPTION
3. NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS S 1 1 9 45 1 08 1 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 73 41 1 3 10 3 30 78 75 83 82 MTG SLOTS 0 148 3 756 WIDE 3 80 TO CLEAR 6 SCREWS 2 PLACES 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS ENCLOSURE DIMENSIONS R SURFACE MOUNTING SNAPTRACK MOUNTING SM OPTION 5 OPTION SRE 2 aa nare Virom uien S 29 AUG oo om rev NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS HOUSING ST OPTION 2 25et 1 1 94501 1 2501 TRANSMITTER ASSEMBLY FOR XPDx 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 Acromag Series 250T TRANSMITTER ASSEMBLY WITH DISPLAY ASS
4. Water Tight Enclosure Non corrosive NEMA 4X Window Shipping weight 5 pounds 2 3Kg packed 4XD1 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7Kg packed 4XD3 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Engineering Units Display Option D3 Shipping 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 8 D Class II Groups F amp G Class and NEMA 4 water tight requirements Transmitter is mounted within the enclosure at the factory Explosion Proof Water Tight Enclosure No Window Shipping weight 5 pounds 2 3Kg packed XPD1 Explosion Proof Water Tight Enclosure With Window Includes the Standard Display Option D1 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
5. as an option when specifying the 4X 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 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 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 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 C to 50 C 32 to 122 F Storage 20 C to 70 C 40 to 158 F Over range The three lower order digits
6. 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 checks the performance of each transmitter POWER SUPPLY OPTIONAL GROUND Y CONTROL ROOM TYPICAL SERIES 250 PROCESS LOOP 5 DIGIT DVM CALIBRATION SETUP INPUT POWER SUPPLY SUPPLY POWER AC VOLTAGE ISOLATION TRANSMITTER ADJUSTMENTS BSSR DVM TEST SIGNAL ZERO SPAN PROTECTION 2 169 5 40 2009 3 ADJUST ADJUST 0 1 25 INPUT DIVIDER SIGNAL OUTPUT AC VOLTAGE RECTIFIER AND AMPLIFIER AMPLIFIER OPTIONAL SIGNAL ISOLATION DISPLAY GROUND 4 VOLTAGE INPUT AC VOLTAGE INPUT RECOMMENDED 5 SERIES 25 T VAC SIMPLIFIED SCHEMATIC 1 L GROUND 0 AC VOLTAGE TT INPUT CONNECTIONS Acromag os 84 E SIMPLIFIED SCHEMATIC TYPICAL INST D 9 5 90 4501448 G 4 20 OPTIONAL RIPPLE FILTER DC SUPPLY OUTPUT TRANSMITTER ADJUSTMENTS
7. the designated mounting surface A transmitter ordered with the DIN Rail mounting option DIN can be mounted to either the 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 Note that 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 into the upper arm of the connector 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 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 Note It is recommended that the transmitter be removed from the enclosure during the process of drilling holes installing fittings and mounting the enclosure 5 NEMA 4
8. 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 Reference Test Conditions Input 0 to 150V 60 2 output 4 20mA into a 500 ohm load 77 F 25 C 24V DC supply Accuracy Better than 0 5 of calibrated span This error includes the combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution Ambient Temperature Range 13 F to 185 F 250 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 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 amp devices may require a 0 1uF capacitor inserted across the load Bandwidth at 1 typical Response Time For a step input the output reaches 98 of its transition in 300ms typical Noise Rejection Common Mode Better than 85dB at 60 Hz 100 ohm unbalance typical Normal Mode Not Applicable Resistance Less than 0 5 of output span change with field strengths of up to 10V meter at fre
9. transmitter B DISPLAY Display Adjustment Procedure If the unit you are calibrating has a display the display is calibrated separately from the transmitter However the calibration of the transmitter must be verified FIRST see above procedure before verifying calibration of the display module Refer to Drawing 4501 371 for location of the 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 VAC XPD1 NCR Input 0 to 150V AC Display 0 to 100 0 1 Set the input source to 0 00V AC 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 150 00V AC the full scale point of the transmitter s span Adjust the Span DS pot on the Display module for correct full scale indication 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 periodic cleaning and calibration verification When a failure is suspected a convenient method for identifying a faulty transmitter is to exchange it with a known
10. 1 FAX 248 624 9234 Copyright 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 497 A94A000 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 VAC XPD1 NCR C Mounting Certification Display NCR Notes Table 1 1 Unit can be ordered with or without factory calibration if unit is factory calibrated to customer specifications the model number suffix C will indicate this Any customer specified calibration information 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 AC Voltage with spans from 60 to 150V AC and convert this signal to a 4 to 20mA process current output Input circuit isolation is standard The unit also includes wide range zero and span adjustments The transmitters are RFl protected operate over large temperature ranges and feature excellent temperature coefficients which minimize the effects from the harsh plant environment Following basic two wire design the output and DC pow
11. Acromag User s Manual Series 250T AC Voltage Input Two Wire Transmitters Table of Contents Page Introduction 1 Description LL L LL LL LL 1 Specifications 2 Specifications Display Option 3 Installation 4 Calibration de 5 General Maintenance dd 5 List of Drawings Typical Installation amp Simplified Schematic 4501 448 7 Electrical Connections AC Voltage Input 4501 371 8 Dimensions DIN Rail Mounting 4501 080 sit 9 Dimensions Surface amp Snaptrack Mtg 4501 081 10 Mechanical Assembly Mounting amp 4X Enclosures 4501 082 11 NEMA 4 amp 12 Enclosures 4501 083 st 12 NEMA 4X Enclosure 4501 086 sss 13 NEMA 4X Enclosure with Window 4501 087 ss 14 Explosion Proof Enclosure 4501 084 dd 15 Explosion Proof Enclosure with Window 4501 085 16 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 Inc 30765 Wixom Road P O Box 437 Wixom Michigan 48393 7037 USA Tel 248 624 154
12. EMBLY MOUNTED DISPLAY ASSEMBLY REMOVED DISPLAY ASSEMBLY SHOWN PARTIALLY REMOVED FROM TRANSMITTER DISPLAY ASSEMBLY COMPONENT PARTS A FACTORY UNIT ASSEMBLY BLACK PLASTIC DISPLAY TRANSMITTER ASSEMBLY 2 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 29 PAN HEAD REMOVAL DISPLAY ASSEMBLY CONNECTION PINS STEEL THREAD CUTTING SHOWN EXTRACTED FROM ACROMAG 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 14 94 A 6 28 981 TTav Ke Tour MICK TRANSMITTER DISPLAY ASSEMBLY ie E 4501 082 SERIES 2501 TRANSMITTER SHOWN IN ENCLOSURE WITH COVER OPEN NOTE ROOM 15 AVAILABLE FOR A SECO
13. ND UNIT WITH THE 5 SURFACE MOUNT OPTION ORDER SEPARATELY NOTE ALL DIMENSIONS ARE iN INCHES MILLIMETERS GROUND WIRE CONNECTION SEE NOTE 1 JESE 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 9 MICH eno ENCLOSURE N4 amp 12 OPTION 0 250T 1 1 94501 83 MOUNTING SCREWS 2 PLACES 6 20 THD 9 313 INCH SERIES 2507 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED OUTPUT SERIES 250 TRANSMITTER SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS Se Rr 4 875 123 83 6 312 168 32 25 40 ee Sot 123 83 1 000 ENCLOSURE DIMENSIONS 4 OPTION 25 40 4 125 194 78 9 75 19 0 2 PLACES DIMPLE PROVIDED FOR DRILLING A 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE Actomag mixon 28 981 oe gt ENCLOSURE 4 OPTION _ 2507 24501086 H
14. 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 ere 9 pare lt ENCLOSURE OPTION OPPS 25 3 54501 085
15. X and 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 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 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 the 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 371 These transmitters operate from DC power supplies only Powe
16. blank for gt 1999 counts Display Accuracy 0 1 of reading 2 counts Series 250T User s Manual Transmitters AC Voltage Input Two Wire 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 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 this is not compromised Maximum operating ambient temperatures should be within 13 OF to 1850 25 C to 85 C for satisfactory performance Factory calibrated units are ready for installation Connect as shown in Connection Drawing 4501 371 If 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 2 3 DIN Rail Mounting Use suitable fastening hardware to secure the DIN rail to
17. er share the same pair of twisted copper wires The transmitter acts similar to a variable resistor in series with the load and DC supply and provides an output loop current proportional to the input sensor signal See Drawing 4501 448 for a simplified schematic Series 250T User s Manual Transmitters AC Voltage Input Two Wire Other Series 250T transmitters are available to condition DC voltage DC current frequency RTD thermocouple AC current and slidewire potentiometer inputs These field mounted two wire transmitters are designed to support a variety of mounting options 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 4X and explosion proof enclosures The model number of the unit specifies the mounting enclosure type When mounted in the explosion proof enclosure the transmitter 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 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 two wire transmitte
18. ght 1 pound 0 45Kg packed SM General Purpose Housing Surface Mount Refer to Drawing 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed ST General Purpose Housing SNAPTRACK Refer to Drawing 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45Kg packed 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 may accommodate a second Series 250T transmitter with the surface mount option SM 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 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 Shipping weight 6 pounds 2 7Kg packed Non Corrosive Water Tight Enclosures NEMA 4X Option types listed below Refer to Drawing 4501 086 NO DISPLAY WINDOW or Drawing 4501 087 WITH DISPLAY WINDOW for outline and clearance dimensions Enclosure material ADALEX Finish Gelcoat Transmitter is mounted within the enclosure at the factory 4
19. n a continuous basis CALIBRATION A TRANSMITTER This section provides calibration information If the unit was factory calibrated verification of the calibration can be made per the following Transmitter Adjustment Procedure Transmitter Adjustment Procedure Connect unit as shown in Calibration Connection Drawing 4501 448 For best results the input signal source should be adjustable over the entire input range of the unit settable to an accuracy of 0 25 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 25 accuracy or better for proper results The Zero and Span adjustments are accessible on the front panel of the transmitter see Drawing 4501 448 for location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide Transmitter Calibration Example MODEL 250T VAC XPD1 NCR Input 150V AC Output 4 20mA 1 Set the input source to 0 00V AC Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set the input source to 150 00 AC Adjust the Span S until the output reads 20 000mA DC 3 Repeat steps 1 and 2 until the readings converge The instrument is now calibrated Several mid point values should also be checked to verify proper operation of the
20. quencies of 27MHz 151 2 and 467 MHz EMI Resistance Less than 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 to 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 Series 250T User s Manual Transmitters AC Voltage Input Two Wire MOUNTING DISPLAY A wide variety of mounting options and enclosures are available to meet the needs of your installation The available models are listed below The transmitter is shipped as a complete assembly General Purpose Housing Available with the 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 4501 080 for outline and clearance dimensions Shipping Wei
21. r 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 volt peak to peak of power supply ripple The unit may have up to 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 However if the transmitter is mounted in a metal housing a ground wire connection is required Connect the ground terminal green screw to earth ground using suitable wire per applicable codes Series 250T User s Manual Transmitters AC Voltage Input Two Wire 3 Input Connect input per Connection Drawing 4501 371 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 o
22. rs condition an AC Voltage 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 accessible from the front of the unit The transmitter has various mounting and enclosure options available MODEL SERIES 250T INPUT VAC AC Voltage 50 60 Hz spans 60 to 150V AC zero offset from 0 to 90V AC both continuous adjustments Unit will withstand 2 0 times full scale continuously Input impedance is 100K ohms nominal Isolation The input circuit is electrically isolated from the output power circuit 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 for the voltage rating specified Output 4 20mA DC output Note A Test Signal of 40mV to 200mV is available at the output terminals and corresponds to 4mA to 20mA of loop current see Drawing 4501 371 Power An external loop power supply is required 12V DC minimum 50V DC maximum The DC supply must never exceed 75 volts peak instantaneously or damage to the unit may occur Unit has reverse polarity protection built in Output Limits typical 3 8mA DC to 26mA DC Load Resistance Range Equation R Load Maximum V supply 12V 20 At 24V supply R Load 0
Download Pdf Manuals
Related Search