Series 250T Potentiometer/Slidewire Input, Two-Wire
Contents
1. 24V DC supply Accuracy 0 1 of calibrated span The error includes the combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution 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 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 change for a 100 ohm change in load resistance 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 inserted across the load Bandwidth at 2Hz typical Response Time For a step input the output reaches 98 of output span in 300ms typical Noise Rejection Common Mode Better than 130dB at 60 Hz typical 100 ohm unbalance Normal Mode 50dB at 60HZ typical 100 ohm source Resistance Less than 0 5 of output span effect with field strengths of up to 10V meter at frequencies of 27MHz 151MHz 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 Unit2. 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 BRACKET SCREW 2 PLACES OUTPUT 6 32 THD 0 25 INCH S 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 r 14 APR 94 940027 TAV EC 28 AUG 98 TTav Ke Tour MICK TRANSMITTER DISPLAY ASSEMBLY 51 zor iri E asei 08z al 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 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
3. 2 89 73 41 1 3 10 3 30 78 75 83 82 SLOTS 148 3 756 WIDE 380 CLEAR 6 SCREWS 2 PLACES 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS ENCLOSURE DIMENSIONS AEN a SURFACE MOUNTING SNAPTRACK MOUNTING SM OPTION 5 OPTION ee wien 29 AUG 991 om eno Tow NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS me HOUSING SM 5 OPTION 28 2971 191 4501 081 25 T TRANSMITTER ASSEMBLY FOR XPDx ENCLOSURES NOTE TO REMOVE TRANSMITTER FROM DISPLAY ASSEMBLY PROCEED AS FOLLOWS REMOVE SCREWS ITEM A 2 PLACES B PULL DISPLAY ASSEMBLY AND DISPLAY MTG BRACKET B FROM TRANSMITTER SIX PIN CONNECTOR WILL DISCONNECT FROM TRANSMITTER C FOR ACCESS TO INTERNAL CONFIGURATION JUMPERS TAKE PLASTIC ENCLOSURE APART AT SEAMS USING A FLAT BLADE SCREWDRIVER D MOUNTING BRACKET ITEM 15 HELD IN PLACE BY TWO HALVES OF THE PLASTIC ENCLOSURE OUTPUT Acromag Series 250T 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 2 ENCLOSURE REMOVAL NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS OUTPUT TERMINALS
4. 4 PLACES 4 N12 OPTION ENCLOSURE DIMENSIONS 1 MICH L oz ENCLOSURE N4 amp 12 OPTION p 250T 1 1 94501 83 L MOUNTING SCREWS 2 PLACES 6 20 THD 313 INCH SERIES 2507 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED OUTPUT SERIES 2501 TRANSMITTER SHOWN REMOVED FROM ENCLOSURE NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS Es gt Rr 4 875 123 83 6 312 160 32 25 40 123 83 gt 1 000 K ENCLOSURE DIMENSIONS 4 OPTION 25 40 4 125 194 78 9 75 19 0 NPT 2 PLACES DIMPLE PROVIDED FOR DRILLING 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE Actomag 28 0 98 Ta HT ez RE ENCLOSURE 4X OPTION D 2507 24501086 H 222 c 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
5. C to 50 C 32 OF to 122 F Storage 20 C to 70 C 4 OF to 1580F Over range The three lower order digits blank for gt 1999 counts Series 250 User s Manual Input Potentiometer Slidewire 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 INSTALLATION The transmitter is packaged in a general purpose plastic enclosure and available for mounting 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 185 F 25 C to 85 C for satisfactory performance Factory calibrated units are ready for installation Connect unit as shown in Connection Drawing 4501 416 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
6. 875 123 83 1 009 25 40 1 000 ke 25 40 ENCLOSURE DIMENSIONS 4 OPTION DIMPLE PROVIDED FOR DRILLING 0 283 7 19 DIAMETER HOLE 2 PLACES OVER SOLID FRONT FACE 75 19 0 NPT 2 PLACES MICH mY 00 ENCLOSURE 4XDx OPTION o sr 1 1 4501 087 3 Acromag 2 28 sal Ke KG DAE O RING GASKET FRONT FACE MOUNTING SCREWS 2 PLACES 6 32 THD 25 INCH SERIES 2591 TRANSMITTER SHOWN INSTALLED IN ENCLOSURE WITH COVER REMOVED 4 60 116 84 1 09 25 4 9 75 19 05 SERIES 2507 TRANSMITTER 2 PLACES ENCLOSURE ENCLOSURE DIMENSIONS XP OPTION MICH 98 90 TW KG NOTE ALL DIMENSIONS IN INCHES MILLIMETERS ENCLOSURE XP OPTION 094 25 1 4501 4 6 32 THD SERIES 2507 TRANSMITTER WITH DISPLAY OPTION SHOWN IN ENCLOSURE WITH COVER REMOVED SERIES 250T 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 MODU
7. is tested to 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 Terminals Compression type wire size 14 AWG maximum Circuit Board Coating Fungus resistant acrylic conformal coat Mounting Position Position insensitive Case Self extinguishing NYLON Type 6 6 polyamide black thermo plastic UL94 V 2 General Purpose NEMA Type 1 enclosure Series 250 User s Manual Input Potentiometer Slidewire 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 G amp T rails G 32mm 50035 Rail 35mm 50022 Refer to Drawing 4501 080 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed SM General Purpose Housing Surface Mount Refer to Drawing 4501 081 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed ST General Purpose Housing SNAPTRACK Refer to Drawing 4501 081 fo
8. packed 4XD2 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Temperature Display Option D2 Shipping weight 6 pounds 2 7 Kg packed 4XD3 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Engineering Units Display Option D3 Shipping weight 6 pounds 2 7 Kg 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 B C amp D Class II Groups E F amp G Class Ill and NEMA 4 water tight requirements Transmitter is mounted within enclosure at the factory 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 pou
9. 1 449 for a simplified schematic Series 250 User s Manual Input Potentiometer Slidewire These field mounted two wire transmitters support a variety of customer specified mounting configurations The transmitter is available for DIN rail mounting Surface Mounting 3 inch SNAPTRACK plastic 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 This transmitter with the explosion proof enclosure mounting option 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 a three wire potentiometer or slidewire input using constant voltage excitation and convert the input signal to 4 to 20 process current output Wide range zero and span adjustments utilize 22 turn potentiometers which are accessible from the front of the unit The transmitter has various mounting and enclosure options available MODEL SERIES 250T INPU
10. Acromag 4 User s Manual Series 250T Potentiometer Slidewire Input Two Wire Transmitters Table of Contents Introduction List of Drawings Typical Installation amp Simplified Schematic 4501 449 Electrical Connections Pot Slidewire Input 4501 416 6 7 Dimensions DIN Rail Mounting 4501 0800 2 2 5 5 8 9 Dimensions Surface amp Snaptrack Mounting 4501 081 Mechanical Assembly Mounting XP amp 4X Enclosures 4501 082 10 NEMA 4 amp 12 Enclosures 4501 083 11 NEMA 4X Enclosure 4501 086 12 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 1541 FAX 248 624 9234 Copyright 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 508 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 N
11. LE ENCLOSURE DIMENSIONS 0 75 NPT 19 05 0 8 2 PLACES O RING GASKET XPDx OPTION ere 9 pare Eno f cur ENCLOSURE OPTION OPPS 25 _ i 1 4501 085 G
12. Procedure If your transmitter has the display option the display is calibrated separately from the transmitter The calibration of the transmitter should be verified FIRST before verifying the calibration of the display module follow above procedure Refer to Drawing 4501 416 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 specific customer specified range the display Zero DZ and Span DS adjustments are trim adjustments only Display Calibration Example MODEL 250T P XPD1 NCR Input Slidewire 100 to 10 000 ohms Display 0 to 100 0 1 Set the slidewire to its minimum position for your application the Zero point of the transmitter 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 slidewire to its maximum position for your application the full scale point of the transmitter span Adjust the Span DS pot of 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 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 exch
13. T P 100 ohm to 10 000 ohm three wire potentiometer or slidewire Excitation 0 175V DC nominal constant voltage current limited to 2 0mA nominal Adjustments Zero Adjustment 0 to 75 of slidewire resistance Span Adjustment 25 to 100 of slidewire resistance Isolation The input circuit is electrically isolated from the 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 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 representing 4 to 20mA of output current is available at the output terminals see Drawing 4501 416 Power An external loop power supply is required 12V DC minimum 50V DC maximum Under no circumstances must this supply ever exceed 75 volts peak instantaneously Unit has reverse polarity protection Output Limits typical 3 8mA DC to 26mA DC Load Resistance Range Equation R Load Maximum V supply 12 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 Reference Test Conditions Input 100 ohm slidewire with a 100 ohm span Output 4 20mA into 500 ohm load 77 F 25 C
14. WIRE POT SLIDEWIRE POT INPUT INPUT SLIDEWIRE TRANSMITTER POTENTIOMETER INPUT SERIES 250 DISPLAY OPTION SERIES 250 SLIDEWIRE POT INPUT ELECTRICAL CONNECTIONS Acromag 1 OPTIONAL MICH GROUND rev INPUT CONNECTIONS D sr NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 0 45 25 9 11 43 2 1 WIRE INSERTION CLAMPS 6 PLACES 1 1 a RAIL DIN MOUNTING RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE 3 DIN EN 50035 32mm DIN EN 59022 35mm 0 RAIL DIN MOUNTING SHOWN HERE DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm 3 11 79 0 1 55 1 55 4 39 4 89 4 NOTE ADJACENT UNITS CAN BE MOUNTED 2 89 ON 1 0 INCH 25 4mm CENTERS 73 41 3 35 85 09 3 55 90 17 SCREWDRIVER 510 FOR REMOVAL FROM RAIL 5 6 e Dare Rev enc fa ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING OPTION NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS 19 1 4501 080 5 B I ral D I F NOTE PLASTIC ENCLOSURE SNAPS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS TOGETHER AT SEAMS WIRE INSERTION SCREWDRIVER WIRE INSERTION LOCATION 2 PLACES LOCATION 2 PLACES MOVAL
15. ange 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 4 20 POWER SUPPLY 1 OPTIONAL 5 DIGIT GROUND Y TYPICAL SERIES 259T PROCESS LOOP TRANSMITTER ADJUSTMENTS REVERSE POLARITY DVM TEST SIGNAL PROTECTION 40 200mv EXCITATION 9 14 25ppm 4 20 ZERO SPAN SUPPLY AND ADJUST ADJUST I LIMITER OUTPUT AMPLIFIER SIGNAL AMPLIFIER SIGNAL OPTIONAL DISPLAY PREAMP AND FILTER SLIDEWIRE POT INPUT SLIDEWIRE POT INPUT GROUND RECOMMENDED CALIBRATION SETUP TRANSMITTER INPUT POWER INPUT SUPPLY SUPPLY SLIDEWIRE POWER POTENTIOMETER ISOLATION SERIES 2501 SIMPLIFIED SCHEMATIC OPTIONAL GROUND Atomag INPUT CONNECTIONS wens ME SIMPLIFIED SCHEMATIC TYPICAL INST p 2sat p 1 118 4501 449 TRANSMITTER RIPPLE FILTER ADJUSTMENTS OUTPUT CURRENT SENSE 1uF TYPICAL NOTE A 10 OHM SERIES RESISTOR IS BUILT IN 0 1 25ppm MEASUREMENT RANGE IS 40 200mV FOR 4 20mA DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST Series 2501 SLIDE
16. 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 can be mounted to either the T or G Rail Installation of the transmitter to the rail depends on the type of DIN rail used 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 and twist to release the unit from the track while tipping 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 re
17. moved from the enclosure during the process of drilling holes installing fittings and mounting the enclosure 5 NEMA 4X 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 the two screws securing it to the bottom of the enclosure Install the transmitter into the enclosure after the enclosure is installed 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 input signal wiring for safety as well as for low noise pickup 1 Outpu
18. nds 2 7 Kg packed DISPLAY OPTION The Display is available 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 xxD2 Temperature Display Option D2 Not applicable 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
19. r outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed 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 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 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 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 enclosure at factory Water Tight Enclosure Non corrosive NEMA 4X Window Shipping weight 5 pounds 2 3 Kg packed 4XD1 Water Tight Enclosure Non corrosive NEMA 4X With Window Includes the Standard Display Option D1 Shipping weight 6 pounds 2 7 Kg
20. t Power Connect a DC power supply and load per Connection Drawing 4501 416 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 the 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 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 in the General Purpose plastic housing does not require an earth ground connection 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 3 Input Connect input per connection diagram Note The input circuit is electrically isolated from the output power circuit allowing the input to operate at up to 250V AC or 354 DC off ground on a continuous basis Series 250 User s Man
21. ual Input Potentiometer Slidewire CALIBRATION A TRANSMITTER The calibration example below is used for reference Calibration is essentially the same for units with other input spans Transmitter Adjustment Procedure Connect the transmitter as shown in the Calibration Connection Drawing 4501 449 Calibration should be performed with the actual slidewire or potentiometer used in the end system 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 05 accuracy or better for proper results The Zero and Span adjustments are accessible on the front panel of the transmitter see Drawing 4501 449 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 P DIN NCR Input Slidewire 100 to 10 000 ohms Output 4 to 20mA DC 1 Set the slidewire to its minimum position for your application Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set the slidewire to its maximum position for your application Adjust the Span S pot 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 be checked to verify proper operation of the transmitter B DISPLAY Display Adjustment
22. umber Format 250T Input Mounting Display Certification B Typical Model Number 250T P XPD1 NCR Certification NCR Series Mounting Display Notes Table 1 1 Unit cannot be factory calibrated to customer specifications no suffix required 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION These two wire transmitters condition a direct three wire potentiometer or slidewire input and convert the wiper rotation or position to a high level process current output The transmitter provides constant voltage excitation to the sensor and allows the use of potentiometers or slidewires with values from 100 ohms to 10K ohms Applications for this device include the manual control of valves position sensing for actuators level sensors and test equipment Input circuit isolation is standard The unit has wide range zero and span adjustments These transmitters are RFI protected operate over a wide temperature range and feature excellent temperature coefficients which minimize effects from harsh plant environments Following basic two wire design the output signal and DC power share the same twisted pair of wires The transmitter acting similar to a variable resistor in series with the load and DC supply provides an output loop current proportional to the input sensor signal See Drawing 450
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