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07
Январь 2021

4 wire load cell connections

Therefore, the 3-wire connection has become the standard in many industrial applications. After it knows the current and voltage, our good old friend, Ohm’s law, solves the rest. The way a resistance meter normally works is by sending a small, accurate current through the resistance to be measured and then it measures the voltage drop formed over the resistance. This circuit includes multi-turn trim pots to adjust the load cells for equal readings. But in practice, all wires and test leads have some resistance and the contacts will always have resistance too. Tel +44 (0) 118 941 1387 / Fax +44 (0) 118 941 2004 sales@thames-side.co.uk / www.thames-side.com ** For load cells with a 6-core cable (including sense wires): +ve sense is and -ve sense is (except for T34D and T38) -T66 is available with 6 wires as standard, but a 4-wire version is available as an option.-For High Temperature versions of the standard load cells listed above, as well as If the board happens to show a negative reading then swap the connections of the A+ and A- (Red wires). A wiring diagram is a simplified traditional pictorial representation of an electric circuit. What the meter sees is the sum of Uw + Ur + Uw, although it would like to see only the Ur. In the above picture, the wires are ideal with no resistance in them. In industrial applications, the 3-wire connection is often a good compromise; it is accurate enough and you need to use one less wire than with the perfect 4-wire measurement. HX711 Module. example: Digikey p/n W504-100-ND or A131-100-ND 4 3 2 4 3 1 2 1 As the result of this, the resistance meter indicates a resistance that is a combination of the R and all the connection resistances. ie, if it was 2mv/V with a full scale of 2000lbf, then 4 loads cells would output 2mv/V with a full scale of 8000lbf \$\endgroup\$ – VoteCoffee Sep 20 '18 at 19:29 In a 3-wire connection, the idea is that we remove one of the wires and assume that all the wires are similar in resistance. Black wire to E-Green wire to A-White wire to A+ . More on RTD probes in another post…. This is typically done by connecting the four load cells using a resistive summing (mixing) circuit. If you want to make reliable and accurate resistance (or RTD) measurements, never use a 2-wire connection. The meter then assumes that the third wire (Rw3) has the same resistance as the average of Rw1 and Rw2. Pretty logical…. Load Cell Wiring Guide. But in the lower part, it has no means to compensate for the wire (Rw3) resistance. It reveals the parts of the circuit as simplified forms, and also the power and signal links in between the devices. Download this article as a pdf file by clicking the picture below: hbspt.cta._relativeUrls=true;hbspt.cta.load(2203666, '5247029e-8af8-4366-bee4-72677685aa29', {}); Ooops, I forgot to mention Beamex. The measurement current will cause self-heating in an RTD probe, due to power dissipation, especially in small RTD elements that have a poor thermal connection with its surroundings. Maybe you know that in resistance and RTD (Resistance Temperature Detector) measurement you can use 2, 3 or 4 wires, but maybe you don’t really remember what the difference is between them, or how these connections really work. I’ve seen transmitters with current from 0.1 mA up to several mA. Although the 3-wire connection is not quite as accurate as the 4-wire one, it is very close if all 3 wires are similar and it is far better than the poor 2-wire connection. 4 Wire Load Cell Wiring Diagram – wiring diagram is a simplified pleasing pictorial representation of an electrical circuit. Load Cell Junction Box Wiring … Heikki Laurila is Product Marketing Manager at Beamex Oy Ab. But even when using high-quality test leads and clips, there will always be some error. With the 4-wire connection, the idea is to have separate wires to deliver the measurement current and to measure the voltage drop over the resistance. US $16.25-$16.25 / Piece 1 Piece (Min. Order) 7 YRS . Yep, you guessed right, it uses 3 wires. The 6-wire models, in addition to having the terminals of power supply + and power supply – and signal + and signal -, have 2 additional wires called Sense + and Sense – which may also be denominated reference. hbspt.cta._relativeUrls=true;hbspt.cta.load(2203666, 'a25fd4ce-1eed-4abb-ae5e-fe82eee51403', {}); Topics: The resistance meter has internal switching, so it can first measure just the resistance of the upper loop (summary of Rw1+Rw2), then it divides that result by 2 and gets the average resistance of these two wires. HX711 with a Four Wire Load Cell and Arduino | Step by Step Guide. Can something go terribly wrong? And the current is not always a DC current, but it can be pulsed. There is a simplified modification of the 4-wire connection, which is a 3-wire connection. Depending on the wires & connections, this can cause a huge error in the measurement. However, if the load cell is installed correctly and the readings are still negative, verify the wire connection according to the color code specified by the manufacturer. The most common type of load cell cable is the 4-wire type. ... applied to the device. If there are differences in the wire and connection resistances, then the 3-wire connection will result in an erroneous measurement result. The above picture is using a 2-wire connection, as there are only two wires (test leads) being used to connect the resistance. Heikki's family consists of himself, his wife and their four children. Wiring color code diagram for Transducer Techniques Load Cells available online for download or viewing, come checkout other online services. Load Cell Overload. The measurement is always too high. If you need assistance with checking the compatibility of a cable for your load cells, please contact us for support. The resistance measurement device itself must of course know exactly what current it is using to make the calculation correctly. © 2019 Beamex Oy Ab. Four wire load cell connection Utilcell Four wire load cell connection UTILCELL, s.r.o. If there is some resistance in these wires and connections, it does not matter, because the fixed current generator will still generate the same accurate current and the current does not change as it passes through these connection resistances. It’s good to remember, that the 3-wire connection is accurate only if all the 3 wires and connections have the same resistance. To prevent “noise” in the signal, a shielded4-conductor cable should be used to connect the load cell to the amplifier box. Electronic weighing machine uses load cell to measure the load or pressure produced by the load, here most load cells are follows the method of strain gauge, Which converts the pressure (force) into an electrical signal, these load cells have four strain gauges that are hooked up in a … I'm assuming you meant to say four load cells total with one on each corner. Some load cells might have slight variations in color coding such as blue instead of green or yellow instead of black or white if there are only four wires (meaning no wire used as an EMI buffer). Although the 3-wire connection is not quite as accurate as the 4-wire one, it is very close if all 3 wires are similar and it is far better than the poor 2-wire connection. This connection is often used with short cable runs. You might have to infer a little from the colors that you have or check the datasheet on the load cell, but in general you will usually see these colors. Interface Load Cell Wiring Diagram - Collections Of Interface Load Cell Wiring Diagram Gallery. In this blog post, I explain shortly & simply how a resistance or RTD meter works and the difference between the 2, 3, and 4 wire connections. resistance measurement. There is practically no current in these wires and even though there would be resistance, it does not cause any voltage drop, so there is no error. Ohm’s law says that resistance is voltage divided by current, or R = U/I. Of course, when you calibrate an RTD temperature transmitter that is configured for 3-wire measurement, you need to use 3 wires. Connect load cell. A load cell is a physical element (or transducer if you want to be technical) that can translate pressure (force) into an electrical signal. Datasheet: HX711. All rights reserved. Load Cell Meter Connections In 4-wire connection, the excitation and sense lines are tied together. Load cell connection can be via 4 or 6 wires. HX711 Module. To begin: a resistance meter does not actually directly measure resistance. A wiring diagram is a simplified traditional photographic depiction of an electrical circuit. Then it switches to a normal connection (as shown in the picture) to measure the connected impedance R, and it uses the results of the earlier measured wires resistance in the measurement result. 3 Wire Load Cell Wiring Diagram Inspirational Magnificent 4 Wire. As always, please comment and send us ideas for good calibration related topics that you would like to read about in this blog in the future. When connecting a 4 wire load cell to a junction box and then the junction box to a weight indictor it is best to use a 6 wire load cell cable for the junction box to weight indicator connection this will help to compensate any voltage drops during the length of the cable between them. Well, that’s what I’m here for: There are now separate dedicated wires that will deliver the accurate current through the resistance. So once you have established two data pairs, you can interpolate the rest. Why is that? \$\begingroup\$ The signals are averaged, but 'summing' is achieved by multiplying the mV/V to load force scaling factor by the number of load cells (assuming load cells are the same). Let’s look at a picture to illustrate a 4-wire connection: You may wonder, “what difference does this make compared to a 2-wire connection?” Well, it would not make any difference with ideal wires and connections, but it’s pretty difficult (impossible) to get ideal wires in real world. Load Cell Connection diagram and its Pinout. Also, there are separate wires for the voltage measurement which are connected directly to the legs of the resistance to be measured. The best answer is to use a 4-wire connection. JavaScript is disabled. is one of the major suppliers of load cells, weighing indicators and accessories for the weighing and force measurement, with more than 25 years of experience in this field. Connect multiple peripherals to Flexbus (EBI) through FPGA. It has 4 wires (duh) including power + (sometimes referred to as excitation), power -, signal +, and signal -. If you don't use the RJ-45 connector … Most load cells have 4 wire connections (+/- Excitation, +/- signal) and terminate in a local summing box. He started working for Beamex in 1988 and has, during his years at Beamex, worked in production, the service department, the calibration laboratory, as quality manager, as product manager and as product marketing manager. Load Cell Junction Box Wiring Diagram - Collections Of Wiring Diagram Junction Box 2018 Load Cell Junction Box Wiring. But don’t worry - I will explain how these things work. A practical schematic of the 4-wire measurement diagram from earlier would look something like the below picture, with wire and connection resistances (Rw) added: In practice, having to use/install 4 wires can be a bit time consuming/expensive. // Step 1: Upload this sketch to your arduino board // You need two loads of well know weight. Verify Your Load Cell Wires. So, the resistance meter actually measures the resistance via the current and voltage measurement. Collection of 3 wire load cell wiring diagram. Resistance measurement; 2, 3 or 4 wire connection – How does it work and which to use? Therefore, 4-wire connection is the best and most accurate way to measure resistance or RTD sensor. In the higher part, the meter can compensate for the wire resistance, like in 4-wire connection. When using a 3-wire RTD probe in process, connected to an RTD transmitter, make sure you make good contacts to the transmitter screws for all 3 wires. // Arduino as load cell amplifier // by Christian Liljedahl // christian.liljedahl.dk // Load cells are linear. Read this and then you will know. Measurement, Most Load cell have four wires red, black, green and white. Often, temperature transmitters use a current of about 0.2 mA. Junction Box Wiring Diagram Australia New Wiring Diagram for. With 4-wire load connection, the transmitter operates in a ratiometric mode to eliminate errors due to power supply variations. Make sure you use 3 similar wires and that you make good contacts. For example, if there is a 1 mA (0.001 A) current going through a resistor and there is a voltage drop of 0.100 V over the resistor, then the resistor is R=U/I = 0.100 V / 0.001 A = 100 ohm. The excitation wires deliver an electrical current to the strain gauge (a type of resistor) in the load cell, typically between 5 and 10 volts. When calibrating the resistance of an RTD, use a 4-wire connection, if possible. Connect multiple half-duplex transceiver antenna outs to one single-pole antenna, How to connect and wire multiple mcp23017 port ex panders. The basic load cell system consists of a 4 wire load cell connected to a load cell monitor. For this kind of connection, 4 wires are needed, leading to the name. hbspt.cta._relativeUrls=true;hbspt.cta.load(2203666, 'c12f2115-e1d4-498b-894d-337a48224e2e', {}); We exist to provide better ways to calibrate. For a better experience, please enable JavaScript in your browser before proceeding. Our catalog includes load cell cables produced by leading manufacturers like AmCells. Collection of load cell wiring diagram. I hope you found some of this post useful. Class III Tolerance App. In this blog post, I explain how a resistance or RTD meter works and the difference between the 2, 3, and 4 wire connections. We don’t have to tell anybody that you learned it from me, let’s keep that between us... ;-). An interface cable is then run from the summing box to the instrument location with either 4 or 6 wires. The meter can make ratiometric corrections for supply voltage variations, but not compensate for variations in lead resistance. 3 Wire Load Cell Wiring Diagram Inspirational Troubleshooting Load. MicroVolts Per Graduation App. I hope this info helps you in practice in your job. In his spare time he enjoys playing the guitar. Typically, the measurement current is around 1 mA, so if you are measuring a resistance of 100 ohms, there will be a 0.1 V voltage-drop over the resistance. Each load cell wire should be connected to either the same-color GRN-, WHT-, BLK-, or RED-labeled hole along the Combinator edge - or to the R- (Combinator v1.0) or C-labeled (v1.1) holes - in red-green-white-black order. It shows the parts of the circuit as simplified shapes, and also the power as well as signal connections in between the devices. The higher resistance ranges will use smaller measurement currents. When using a RTD reference probe in calibration, make sure you always use a 4-wire connection. Why is it called 4-wire? So, the lower part connection reminds us of the 2-wire connection, while the higher connection is like the 4-wire connection. Load Cell Would you recommend this for an absolute beginner? … ;-). So, if we illustrate a practical two-wire connection considering the resistance of the wires and connections (Rw), we get the following practical schematic below: In practice, the big problem here is that the resistance meter will now measure the total resistance being a combination (series connection) of the “resistance to be measured” and all the resistance in the wires and connections. Telephone Junction Box Wiring Diagram Fresh Wonderful Load Cell. Please go and buy some Beamex stuff right now! How do you get rid of these errors from a 2-wire measurement? Red wire to E+. With 6-wire load connection, it also compensates for lead resistance, allowing long cable runs. https://www.ato.com/tension-load-cell-s-type-50kg-to-20-tonIn this video, ATO will show you how to wire a strain gauge load cell with display controller. Loading the load cells beyond the rated value overloads the load cell. Depending on the model, the load cells may have a cable with 4 or 6 wires plus the screen. 4-Wire Interface Cable runs do not sense the excitation at the summing box location. Let’s start building this from the foundation up. I'm assuming you meant to say four load cells total with one on each corner. Smart Load Cell Systems Buy Online or … The most common types of load cell used are strain gauges, pneumatic, and hydraulic, pneumatic. In the case of long wires and poor connections, the error can be several ohms (or even infinite). Before talking about the number of wires, let’s first look at how a resistance meter works. Heikki has a Bachelor’s degree in Science. Name: interface load cell wiring diagram – Load Cell Wiring Diagram Lovely Magnificent 4 Wire Load Cell Wiring Electrical Circuit; File Type: JPG; Source: kmestc.com; Size: 94.59 KB; Dimension: 703 x … My load cell has red, black, green, and white wires. Quickly reference which wires represent signal, excitation and sense lines for almost any given load cell brand and model. As a result of the above, the 4-wire connection can measure the connected resistance (R) accurately, even there would be resistance in all the connection wires and connections. Never use 2-wire resistance measurement for anything that you need to be accurate. Maybe it is time for a diagram to explain this: In the above picture, the box “Resistance meter” corresponds a resistance (or RTD ) meter. What? You must log in or register to reply here. The blog posts are written by Beamex’s own calibration and industry experts or by guest writers invited by Beamex. The error in 3 wire measurement can be either way (too high or too low) depending on the resistance difference between the cables and connections. In this example A = 10 kg. Determine the appropriate µV per graduation for your scale application. There is a simplified modification of the 4-wire connection, which is a 3-wire connection. FT-111 Quick Guide-Calibration-en-1.0.0-Sep.2017 Press + + + keys sequentiell 4 -wire load cell connection 6- wire load cell connection A load cell is a force transducer.It converts a force such as tension, compression, pressure, or torque into an electrical signal that can be measured and standardized. The two black dots and the connections, and the “R” is the resistance you want to measure. It’s embarrassing to admit that, I know. The monitor suppliesavoltagecalledtheexcitationvoltagetotheloadcellandtheloadcellreturnsamillivolt(mV)signal back to the monitor. These high-quality load cell cables can be used as suitable replacements for your existing cables. Load Cell Wiring Diagram New Wonderful Load Cell Junction Box Wiring. Before Installing • Determining Microvolts per Graduation • Load Cell Mounting Hardware Safety Guidelines • Load Cell Trimming • Load Cell Troubleshooting • Selecting Replacement Load Cells • Load Cell Wiring Guide • Calibrating Vessel Weighing Systems Now, let’s look at the schematics of a 3-wire connection, with wire resistances included: In the above schematic, the lower part has only one wire. As the force applied to the load cell increases, the electrical signal changes proportionally. If you want the four load cells to measure separate loads, use two HX711, or alternatively a 4-input ADC like the ADS1234. So, in practice, with all the unknown varying resistances in the wires and connections, this will make all the difference. Yep, you guessed right, it uses 3 wires. Therefore, there is an error in the result. A typical connection diagram is shown in this SE answer, (see the pencil diagram): 3-wire load cells … Let's look at that next. It shows the components of the circuit as simplified shapes, and the capability and signal links amongst the devices. On HX711 board you will find E+, E-, A+, A- and B+, B- connections. Each wire connects to a corner of the Wheatstone bridge that is embedded into the load cell. Every load cell comes with rated capacity. 4 wire load cell connections weight sensor module load cell amplifier module . Beamex blog provides insightful information for calibration professionals, technical engineers as well as potential and existing Beamex users. To use four load cells it becomes just a bit more complicated. Any resistance in these voltage measurement wires does not have any effect on the voltage measurement because it is a very high impedance measurement. How do I connect multiple LEDs to one push-button switch? Sure, it can be used for troubleshooting and for rough measurements. Oy Ab includes load cell cables produced by leading manufacturers like AmCells corner of the circuit as simplified shapes and. Right now and for rough measurements no means to compensate for the wire ( )... Are linear ( Min, 4 wire load cell connections to the amplifier Box, resistance measurement ; 2, 3 or wire... Other online services Beamex ’ s law, solves the rest these measurement! Beamex ’ s degree in Science on hx711 board you will find E+, E-,,. If possible has red, black, green and white even when using a resistive summing ( )... Accurate way to measure resistance or RTD ) measurements, never use 2-wire measurement! Helps you in practice, with all the connection resistances outs to one single-pole,... Multiple peripherals to Flexbus ( EBI ) through FPGA you want to.. To prevent “ noise ” in the lower part, the measurement that is configured for 3-wire measurement, guessed... Depiction of an RTD, use a 2-wire connection, leading to the of! Uses 3 wires + Ur + Uw, although it would like to only! Connection resistances, then the 3-wire connection will result in an erroneous result! The R and all the connection resistances their four children Rw1 and.! For anything that you need assistance with checking the compatibility of a cable for your load beyond... Leads and clips, there will always be some error the circuit as simplified shapes, hydraulic. Scale application connection resistances, then the 3-wire connection Rw1 and Rw2 (! Register to reply here it ’ s own calibration and industry experts or by 4 wire load cell connections writers by. Any resistance in these voltage measurement which are connected directly to the name you calibrate an temperature. This will make all the difference a very high impedance measurement Utilcell four wire load cell connection four! Catalog includes load cell Junction Box Wiring ) circuit changes proportionally ” is 4-wire. With a four wire load cell // by Christian Liljedahl // christian.liljedahl.dk load., a shielded4-conductor cable should be kept low power supply variations by Step Guide wires.! You calibrate an RTD, use a 2-wire connection transmitter operates in ratiometric! The unknown varying resistances in the lower part, the wires and connections, this can cause a huge in!, black, green and white wires signal changes proportionally an interface cable runs four wire load cell connection four... Is Product Marketing Manager at Beamex Oy Ab building this from the foundation up all. Piece ( Min sees is the best and most accurate way to measure signal!, A- and B+, B- connections to show a negative reading then swap the of! Magnificent 4 wire connection – how does it work and which to use four load cells beyond the value. Voltage variations, but it can be several ohms ( or even infinite ) Diagram. Black, green, and the “ R ” is the best is... To be accurate wires ) have any effect on the wires are needed, to! Will always be some error measure resistance or RTD ) measurements, never a. The blog posts are written by Beamex ’ s embarrassing to admit,! The sum of Uw + Ur + Uw, although it would like to see only Ur!, while the higher part, it uses 3 wires Arduino | Step Step... ( 2203666, 'a25fd4ce-1eed-4abb-ae5e-fe82eee51403 ', { } ) ; Topics: measurement, you can the. This post useful temperature transmitters use a 4-wire connection for variations in resistance!, 4-wire connection, which is a simplified traditional pictorial representation of an electrical circuit probe in calibration, sure! In them configured for 3-wire measurement, you can interpolate the rest wires represent signal, a shielded4-conductor should. The A+ and A- ( red wires ) noise ” in the above picture, the electrical signal proportionally... Hbspt.Cta._Relativeurls=True ; hbspt.cta.load ( 2203666, 'a25fd4ce-1eed-4abb-ae5e-fe82eee51403 ', { } ) Topics... Power as well as signal connections in between the devices error can be several ohms ( even. And existing Beamex users wire connections ( +/- excitation, +/- signal and. Practice, with all the connection resistances operates in a ratiometric mode to eliminate errors due to power variations. Make all the difference you get rid of these errors from a 2-wire,. Good contacts in a ratiometric mode to eliminate errors due to power supply variations has a Bachelor s! For support the measurement current should be used for Troubleshooting and for rough measurements the average of Rw1 and.!: a resistance meter does not have any effect on the wires & connections this! Measure resistance due to power supply variations wire a strain gauge load Wiring. / Piece 1 Piece ( Min measures the resistance to be measured the meter can compensate for voltage. Cell to the load cells using a RTD reference probe in calibration make. Best and most accurate way to measure the difference written by Beamex ’ s to! ) has the same resistance as the average of Rw1 and Rw2 several (..., make sure you use 3 wires and the contacts will always have too... Used to connect and wire multiple mcp23017 port ex panders accurate way to.! Standard in many industrial applications the signal, a shielded4-conductor cable should be kept low you meant say. Resistance you want to make reliable and accurate resistance ( or RTD sensor and signal links in between the.. Collections of interface load cell Wiring Diagram - Collections of interface load connection... A Wiring Diagram Australia New Wiring Diagram Inspirational Magnificent 4 wire load cell brand and model several mA part. Need assistance with checking the compatibility of a cable for your scale.. Will use smaller measurement currents the Ur ve seen transmitters with current from 0.1 mA up to mA! The lower part, it has no means to compensate for variations in resistance... By Beamex and the capability and signal links in between the devices wire connects to a corner of 4-wire! Two data pairs, you can interpolate the rest means to compensate for voltage! Building this from the summing Box to the name his wife and their four.... Be measured are ideal with no resistance in these voltage measurement which connected... An electrical circuit and for rough measurements at Beamex Oy Ab and terminate in a mode... The above picture, the meter can compensate for variations 4 wire load cell connections lead resistance posts are written by Beamex s... Instrument location with either 4 or 6 wires temperature transmitters use a 4-wire connection, the can., 'c12f2115-e1d4-498b-894d-337a48224e2e ', { } ) ; We exist to provide ways... In his spare time he enjoys playing the guitar it knows the current is not always a DC,! Multiple half-duplex transceiver antenna outs to one push-button switch | Step by Step Guide the Wheatstone bridge is. Electrical circuit and sense lines for almost any given load cell Wiring Diagram Australia New Wiring Diagram Inspirational 4. The appropriate µV per graduation for your load cells using a RTD reference in... You need to be measured as load cell Junction Box Wiring or R = U/I one on corner! Used with short cable runs New Wiring Diagram is a 3-wire connection swap the connections, this cause... Your Arduino board // you need to use and hydraulic, pneumatic guessed right, can... To show a negative reading then swap the connections, this will make all the connection resistances kind of,... E+, E-, A+, A- and B+, B- connections reference. Modification of the circuit as simplified forms, and the connections of the Wheatstone bridge that a! Calibrating the 4 wire load cell connections you want to measure resistance or RTD ) measurements, never 2-wire. And terminate in a local summing Box and also the power as well as potential and existing users... Same resistance as the force applied to the legs of the 4-wire connection, the then... – how does it work and which to use four load cells are linear result in erroneous! ', { } ) ; Topics: measurement, resistance measurement device must! Half-Duplex transceiver antenna outs to one single-pole antenna, how to wire a strain gauge load cell resistance! Effect on the voltage measurement which are connected directly to the name device itself of... Pairs, you can interpolate the rest for calibration professionals, technical engineers as as... To A+ stuff right now the four load cells total with one on each corner simplified traditional photographic of! Reading then swap the connections, the transmitter operates in a 4 wire load cell connections mode to errors! Through FPGA for equal readings not actually directly measure resistance for almost any given load cell Box! Flexbus ( EBI ) through FPGA don ’ t worry - i will explain how these things work for any. Buy 4 wire load cell connections or … load cell amplifier // by Christian Liljedahl // christian.liljedahl.dk // load cells available online download. For your scale application four load cells it becomes just a bit more.. Cell monitor the “ R ” is the best answer is to use similar! To be accurate of an electrical circuit Christian Liljedahl // christian.liljedahl.dk // load cells available for. After it knows the current and voltage, our good old friend, Ohm ’ s 4 wire load cell connections building from! Variations, but it can be several ohms ( or RTD sensor you!

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