- 1 - User`s Manual: Series 250T Resistance Bulb, RTD
Contents
1. uien S 29 90 ALL DIMENSIONS ARE IN INCHES MILLIMETERS HOUSING 5 5 OPTION 2 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 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 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 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 PA2. MOUNTING SCREWS 2 PLACES 6 32 THD 9 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 on cur NOTE ALL DIMENSIONS IN INCHES MILLIMETERS mE ENCLOSURE XP OPTION 25 re 1854591284 4 5 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 9 75 NPT 19 05 0 8 2 PLACES O RING GASKET OPTION 9 lt ENCLOSURE OPTION OPPS 5 i 45 065 G
3. 0 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS 0 984 8 45 25 0 11 43 i 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 sui DIN EN 50022 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 17 Dare Rev ECN enc ME 25 T HOUSING DIN RAIL MOUNT ENCLOSURE DIMENSIONS DIN RAIL MOUNTING 01 OPTION 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 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 BE
4. 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 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 Series 250T User
5. during the process of drilling holes installing fittings and mounting the enclosure 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 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 Regardless of the mounting configuration employed the electrical connections are basically identical The wire size used to connect the unit to the control system is not critical terminal strips can accommodate wire from 14 26 AWG Strip back the insulation 1 4 inch on each lead before installing it into the terminal block Input wiring may be either a 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 wirin
6. s Manual RTD Platinum Copper 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 1220 Storage 20 C to 70 C 4 F 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 F typical Conversion Rate 2 5 per second INSTALLATION The transmitter is available in a general purpose plastic housing or 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 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 diagram Drawing 4501 078 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 be
7. 0 045 per C over ambient temperature range for reference test conditions 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 capacitor inserted across the load Bandwidth at 3 Hz typical Response Time For step input the output reaches 98 of output span in 350ms typical Noise Rejection Common Mode 120dB 60 Hz 100 ohm unbalance typical Normal Mode 26dB 60 Hz 100 ohm source 20dB 60Hz 10 ohm source RFI Resistance Less than 0 5 of output span with RFI field strengths of up to 10V meter at frequencies of 27 151 and 467 MHz EMI Resistance Less than 0 25 of output span effect with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations are 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 Series 250T User s Manual RTD Platinum Copper 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 Mou
8. 385 output 4 20mA into 500 ohm load 77 F 25 C 24V DC supply 10 3 wire Copper 9 035 ohms at 0 C 0 to 100 C output 4 20mA into 500 ohm load 77 F 25 C 24V DC supply Accuracy A Function of Range listed adjacent to range selected Accuracy includes combined effects of transmitter repeatability hysteresis terminal point linearity and adjustment resolution Does not include sensor error Linearization The unit linearizes the Platinum RTD signal to provide an output signal that represents the percent of span value of the measured temperature The linearization circuit is universal for the model type ordered it allows freedom to calibrate to any input range and linearization will be functional Per manufacturers tables the Copper sensor is linear between 50 C and 150 C Lead Wire Compensation A 100 ohm Platinum RTD Zero shift is less than 0 01 ohm of lead resistance for up to 10 ohms per leg with a total maximum shift of 0 1 10 ohm Copper RTD Zero shift is less than 0 05 ohm of lead resistance for up to 10 ohms per leg with a total maximum shift of 0 5 Ambient Temperature Range 13 F to 185 F 25 C to 85 C Ambient Temperature Effect Combined effects of zero span over temperature RBP Less than 0 01 of output span per OF 0 0189 per C over ambient temperature range for reference test conditions RBC Less than 0 025 of output span per
9. 8 BASIC A TRANSMITTER RESISTANCE ECADE RESISTANCE BULB INPUT RESISTANCE BULB NC 1 1 1 1 1 GROUND GROUND GROUND GROUND 2 RTD 3 WIRE RTD 4 RTD WITH 4 WIRE RTD LOOP COMPENSATION KELVIN TYPE RTD TRANSMITTER ELECTRICAL CONNECTIONS lt RECOMMENDED CALIBRATION SET UP VDC SUPPLY V TRANSMITTER 12VDC MINIMUM 5VDC 29 X 250 OHMS 17VDC MINIMUM OUTPUT TRANSMITTER ADJUSTMENTS Series 250 ADJUSTMENTS RESISTANCE BULB INPUT DISPLAY OPTION ADJUSTMENTS RTD TRANSMITTER CALIBRATION CONNECTIONS A DISPLAY SPAN ADJUST DISPLAY ZERO ADJUST RTD INPUT CONNECTIONS me ne 258 11 4501 078 BOARD INTERCONNECTION ZERO RANGE SELECTION SEE NOTE 2 ZERO RANGE A 50 C 50 PIN 1 TO PIN 2 ZERO RANGE 50 C TO 150 C PIN 3 TO PIN 4 ZERO RANGE 150 C TO 50 C PIN 5 TO PIN 6 EXAMPLE CONFIGURATION RTD ZERO RANGE 50 C 50 ZERO RANGE SELECTION ONE JUMPER PLATINUM RTD ONLY BOARD INTERCONNECTION DISASSEMBLY SEE NOTE 1 JUMPER CONFIGURATION SEE NOTE 1 NOTE 1 REFER TO THE CALIBRATION SECTION OF THE SERIES 250 RTD JUMPER CONFIGURATION JUMPER 15 MOVED a ae elena
10. Acromag User s Manual Series 250T Resistance Bulb RTD Two Wire Transmitters Table of Contents Page Introduction 1 Description 2 Specifications 2 Specifications Display Option 88 4 Installation 5 Calibration L LL LLL 6 General Maintenance 7 List of Drawings Page Electrical Connections RTD Input 4501 078 8 Configuration Jumper Location 4501 088 9 Dimensions DIN Rail Mounting 4501 080 10 Dimensions Surface 8 Snaptrack Mtg 4501 081 11 Mechanical Assembly Mounting XP Enclosures 4501 082 LLL 12 NEMA 4 4 12 Enclosures 4501 083 13 Explosion Proof Enclosure 4501 084 ________ 14 Explosion Proof Enclosure with Window 4501 085 15 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 Itis important that the user employ satisfactory overall system design Itis agreed between the Buyer and Acromag that this is the Buyer s responsibility Acromag Inc Tel 30765 South Wixom Road P O Box 437 Wixom Michigan 48393 7037 USA 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 284 C94D007 I
11. NTRODUCTION 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 RBP1 XP NCR C Mounting Certification Display NCR Approval Notes Table 1 1 RBP1 to RBP3 and RBC1 to 2 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 xx Range Code Number For use with integral display option only the xx represents a standard range code number 01 05 etc for the display Consult the selection and ordering guide for standard range codes Unit can be ordered with or without factory calibration if unit is factory calibrated to a customer s 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 Custom range codes are also available consult the factory 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals Series 250T User s Manual RTD Platinum Copper DESCRIPTION These
12. RT 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 71 115 94 A 40007 TAV BC 28 98 TTav 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 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 Trav or ME ENCLOSURE N4 amp 12 OPTION 250T 1 1 94501 83 O RING GASKET
13. d 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 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 No 4501 084 no display window or Drawing No 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 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 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
14. f 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 transmitter has the Display Option install it at this time Assembly Procedure for the 250T Plastic Housing NOTE The Model Serial Number label is attached to the left side 1 Refer to drawing 4501 088 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 the housing 3 Line up the right side of the housing with the assembly and carefully but firmly press the pieces together B DISPLAY Display Adjustment 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 078 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 RBP1 XPD1 NCR Input 0 to 100 C 100 0 to 138 5 ohms Pla
15. fied see specifications for temperature ranges above Copper RTD 10 ohm with Display Option The Transmitter and Display are configured to a customer specified range code The span range must be within 50 C to 200 C and the zero must be within 50 C to 50 C 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 200mV is available at the output terminals see Drawing 4501 078 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 DC to 26mA DC Load Resistance Range Equation R Load Maximum V supply 12 0 020 At 24V supply R Load 600 ohms Power Supply Effect DC Volts 0 001 of output span per volt DC 60 120 Hz ripple 0 01 of span per volt peak to peak of power supply ripple RTD Break Detection Upscale RTD break detection is standard Reference Test Conditions A 100 ohm 3 wire Platinum 0 100 C Alpha 0 00
16. g for safety as well as for low noise pickup 1 Output Power Connect DC power supply and load per connection diagram refer to Drawing 4501 078 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 60Hz 120Hz 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 if desired 2 Grounding The two wire transmitter in the General Purpose Housing is plastic 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 Series 250T User s Manual RTD Platinum Copper 3 Input Connect input per connection diagram If unit is factory calibrated calibration label i
17. he 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 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 To 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 aligned and carefully push the boards back together Jumper Configuration Shunt Block A shunt bl
18. low 1 DIN Rail Mounting Using suitable fastening hardware secure the DIN rail to the designated mounting surface A transmitter ordered with the DIN Rail mounting option DIN can be mounted to either the or 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 2 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 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 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
19. ndicates 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 Platinum units only not required for Copper units before going to the Transmitter Adjustment Procedure 1 Transmitter Shunt Block Configuration Procedure Platinum Units Only The Platinum RTD transmitter is quite universal in that it can be configured for any of three adjustment ranges with a single jumper Before proceeding with the adjustment procedure this jumper must be configured for the requirements of the application refer to Drawing 4501 088 for details To gain access to the Configuration Jumper 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 jumper shunt block as described in the Jumper Configuration procedure below Note calibration per the Adjustment Procedure should be performed before the circuit boards are reassembled within t
20. nt of span temperature or other engineering units scaled to customer requirements Input wiring is inserted in the bottom of the unit while output wiring is inserted on 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 100 ohm Platinum RTD input or a 10 ohm Copper RTD The unit converts the input signal to a 4 20mA process current output and provides RTD excitation lead wire compensation linearization and wide range zero and span adjustments that utilize 22 turn potentiometers accessible from the front of the unit The transmitter has various mounting and enclosure options available MODEL SERIES 250T INPUT Platinum RTD 100 ohm RBPx 100 ohm Ro Platinum Resistance Temperature Sensor RTD 2 3 or 4 wire connection Standard calibration is based on the international R versus T curve having an alpha of 0 00385 ohms ohm C Pt 385 The unit can also be calibrated for sensors having an alpha of 0 003925 ohms ohm C Pt 392 Maximum excitation current is 1 0 5mA for The span and zero adjustment is a function of the RTD range NOTE linearization is maintained for any calibration within defined range For Platinum units the input range is field selected by means of an internal field configurable jumper Input
21. nting Position Position insensitive 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 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 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 secon
22. ock is provided to accommodate in field configuration changes for the Platinum unit 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 Range Determine the Zero Range that is required by your application refer to the table on Drawing 4501 088 for proper jumper Shunt position Jumper positions are marked A B and C on the circuit board corresponding to sub range A B and C 2 Important Mark the Transmitter s Configuration on the calibration label located on the enclosure Example IN RBP1 Range 0 1009 Jumper Configuration Example The following is the configuration for the example below configure your module as required by your application Configure internal jumper as follows 1 sub range A Zero 50 to 50 C Span 25 to 100 C B Mark label with range selected 2 Transmitter Adjustment Procedure The calibration example below is used for reference only Calibration is essentially the same for units with other inputs Connect the transmitter as shown in the Calibration connection diagram Drawing 4501 078 The high precision resistance decade must be adjustable over the entire range of the unit and settable to an accuracy of 0 1 or better 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 tran
23. perature ranges above RPxx Platinum RTD 100 ohm with Display Option Transmitter and Display configured to a customer specified range code The span range must be within 50 C to 800 C and the zero must be within 150 C to 150 C INPUT Copper RTD 10 ohm RBCx 10 ohm Ro Copper Resistance Temperature Sensor RTD 2 or 3 wire connection Standard calibration is based on a Copper RTD 9 035 ohms at 0 C Maximum excitation is 1 5 DC The span and zero adjustment range is a function of the RTD range code The input span and zero ranges are adjustable as specified below except for special ranges which are factory calibrated per customer requirements NOTE Accuracy The input span and zero ranges are adjustable as specified is in percent of Input Temperature Span Accuracy RBC1 Span 5010 100 C Zero 50 to 500 0 25 RBC2 Span 100 to 200 C Zero 50 to 50 C 0 25 Series 250T User s Manual RTD Platinum Copper The following input type is used when the Temperature Display Option xxD2 is specified The temperature range code xx in field specifies the display range of the Display and the input temperature range of the transmitter For Example 05 range code represents a temperature range of 0 to 100 C Consult the selection and ordering guide for standard range codes Custom range codes are also available consult the factory Transmitter performance is per temperature range speci
24. smitter 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 078 for their location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide Series 250T User s Manual RTD Platinum Copper The resistance representing the temperatures at Zero and at Full Scale are set on the resistance source to obtain the two calibration points Use Table 2 to convert each temperature to its equivalent resistance for the RTD type used Table 2 Temperature vs Resistance Note Pt385 Platinum Alpha 0 00385 Ohms ohm C Pt392 Platinum Alpha 0 00392 Ohms ohm C Temperature in Ohms 100 Ohm Platinum Temperature C 10 Ohm Copper 9 035 0 Transmitter Calibration Example MODEL 250T RBP1 DIN NCR Input 0 to 100 C 100 0 to 138 5 ohms Platinum RTD PT 385 Output 4 to 20mA 1 Set the input resistance decade to 100 0 ohms 0 0 C Adjust the Zero Z pot until the output reads 4 000mA DC 2 Set the input resistance decade to 138 5 ohms 100 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 be checked to verify proper operation o
25. span and zero ranges are adjustable as specified below NOTE Accuracy is in percent of Input Temperature Span RBP1 Platinum RTD 100 ohm Accuracy Range A Span 25 100 C Zero 50to 50 C 0 1 Range Span 25 100 C Zero 50 150 C 0 1 Range Span 25 100 C Zero 150 to 500 40 29 RBP2 Platinum RTD 100 ohm Range A Span 50 200 C Zero 50to 50 C 0 1 Range Span 50 200 C Zero 50 to 1500C 0 1 Range Span 50 2009 Zero 150 500 0 2 Platinum RTD 100 ohm Range A Span 200 800 C Zero 50 C to 50 C Accuracy 200 400 C Spans 0 1 Accuracy 400 800 C Spans 0 5 Range Span 200 800 C Zero 50 to 1509 Accuracy 200 400 C Spans 0 2 Accuracy 400 800 C Spans 0 7 Range Span 200 800 C Zero 150 to 50 C Accuracy 200 400 C Spans 0 2 Accuracy 400 800 C Spans 0 3 The following input type is used when the Temperature Display Option xxD2 is specified The temperature range code designated by xx in field specifies the display range of the Display and the input temperature range of the transmitter For Example 5 range code represents a temperature range of 0 to 100 C Consult the selection and ordering guide for standard range codes Custom range codes are also available consult the factory Transmitter performance is per temperature range specified see specifications for tem
26. tinum RTD Pt 385 Display 0 to 100 0 C 1 Set the input resistance decade to 100 0 ohms Zero point of the transmitter s span Adjust the Zero DZ pot of the Display module for the zero of the display range 0 C in this example 2 Set the input resistance decade to 138 5 ohms 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 C in this example 3 Repeat steps 1 and 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 verification 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 checks the performance of each transmitter 4 2 OUTPUT CURRENT SENSE SUPPLY 40 208mV 1uF TYPICAL BUILT IN RESISTOR 19 OHMS 49 20 TRANSMITTER 4 2 ADJUSTMENTS ir INTERNAL TRANSMITTER CONFIGURATION JUMPERS SEE DRAWING 4501 908
27. two wire transmitters condition either a 2 3 or 4 wire 100 ohm Platinum Resistance Temperature Sensor RTD or a 2 or wire Copper RTD input and convert the signal to a 4 to 20mA process current output Input circuit isolation is standard The unit provides excitation to the sensor lead wire compensation linearization and 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 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 and 3 inch SNAPTRACK plastic rail mounting or in various housings These housings include NEMA 4 NEMA 12 and explosion proof enclosures The model number of the unit specifies the mounting enclosure type The transmitter when mounted in the explosion proof enclosure is available with a 3 1 2 digit LCD readout 1 2 inch character height to provide a visual indication of the transmitter s output The readout is available in perce
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