Watson & Sons 520DUN Peristaltic pumps an overview, How they work, Suitable applications

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6 Peristaltic pumps - an overview

Peristaltic pumps are the simplest possible pump, with no valves, seals or glands to clog or corrode. The fluid contacts only the bore of a tube, eliminating the risk of the pump contaminating the fluid, or the fluid contaminating the pump. Peristaltic pumps can operate dry without risk.

How they work

A compressible tube is squeezed between a roller and a track on an arc of a circle, creating a seal at the point of contact. As the roller advances along the tube, the seal also advances. After the roller has passed, the tube returns to its original shape, creating a partial vacuum which is filled by fluid drawn from the inlet port.

Before the roller reaches the end of the track, a second roller compresses the tube at the start of the track, isolating a packet of fluid between the compression points. As the first roller leaves the track, the second continues to advance, expelling the packet of fluid through the pump’s discharge port. At the same time, a new partial vacuum is created behind the second roller into which more fluid is drawn from the inlet port.

Backflow and siphoning do not occur, and the pump effectively seals the tube when it is inactive. No valves are needed.

The principle may be demonstrated by squeezing a soft tube between thumb and finger and sliding it along: fluid is expelled from one end of the tube while more is drawn in at the other.

Animal digestive tracts function in a similar way.

Suitable applications

Peristaltic pumping is ideal for most fluids, including viscous, shear-sensitive, corro- sive and abrasive fluids, and those containing suspended solids. They are especial- ly useful for pumping operations where hygiene is important.

Peristaltic pumps operate on the positive displacement principle. They are particu- larly suitable for metering, dosing and dispensing applications. Pumps are easy to install, simple to operate and inexpensive to maintain.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual

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Contents Watson-Marlow 520DuN IP66/NEMA 4X pumps ContentsPublication history 104 Decontamination certificate 105 Declaration of incorporation Declaration of conformityExceptions Five year warrantyCased pumps, 620 cased pumps and 720 cased pumps ConditionsComponents supplied 520DuN pump, IP66 Nema 4X models When you unpack your pumpPackaging disposal InspectionStorage Information for returning pumpsHow they work Peristaltic pumps an overviewSuitable applications Safety notes Page Pump specifications Analogue control Remote control520DuN, IP66 Nema 4X model Manual controlNema IP Ingress Protection and Nema definitionsPump specifications Other StandardsHarmonised Standards520DuN IP66/NEMA 4X model Unit weights DimensionsGeneral recommendations Good pump installation practiceDo’s and do not’s Page Connecting this product to a power supply Page Page Start-up check list Switching the pump on for the first timeUser trim First-time start-up defaults LanguageAnalogue input SpeedPump is now ready to operate Manual operation Keypad functions in manual modePage Page Keypad beep Keypad lockManual operation and remote digital inputs and outputs Keypad functions in menu screens Main menuMain menu entry PIN-secure process protection Calibrate Tube Head and tubeCalibration dose Page Setup menu SetupTrim Analogue Input 1 speed Program Scaling stroke TrimAlternatively DisplayBaud Pump number18.7 Xon/Xoff Stop bitsFlow units Run time Run / stop General alarmOutputs Parameters arePage Remote stop Page Auto-restart Backlight Set maximum speedLanguage 18.15 ROMBeep DefaultsSecurity code Exit Pin out detailsTo dispense a master dose MemoDoseTo repeat the dose Changing dosing speedExit 22.1 520N module removal and replacement Automatic control wiringTo remove the 520N watertight module To replace the 520N watertight module Wiring up Page Do not strap the control and mains power cables together Speed analogue input Scaling analogue input Tachometer frequency output Speed analogue outputRun / stop input SwitchDirection input Leak detection input Tube monitor 520N module Wire colourAuto / manual toggle input MemoDose inputSupply voltages Outputs 1, 2, 3Important pump status outputs DC Voltage Max load Typical use 22.14 RS485 inputAutomatic control and operation How to get into auto operationHow to get out of auto operation Emergency stop Network control and operation How to get into network operationHow to get out of network operation Command Parameters Meaning 24.1 RS485 command stringsTroubleshooting Error condition Suggested action Error codesDrive spares Drive maintenanceIdentification of parts 520R, 520R2 and 520RE pumpheads520REL/520REM/520REH To reposition the track Pumphead position, removal and replacementRotor removal Rotor replacementOpening the pumphead guard 29 520R, 520R2 and 520RE installation29.2 520R and 520R2 tube loading 29.3 520RE fitting the drain port 2mm and 6.4mm Industrial Sanitary 29.4 520RE Element loading520REL Pressures Up to 2 bar 30 psi Pressures Up to 4 bar 60 psi Up to 7 bar 100 psiPage Industrial quick-release connectors Sanitary 3⁄4in mini-Tri-clamp connectors29.5 520RE Element connection 30 520R, 520R2 and 520RE maintenance General guide to cleaning with solvents 31 520R, 520R2 and 520RE rotor settingsChemical Cleaning precautions 520R/520R2 520REL/520REM/520REH Pumphead sparesPumping conditions Flow rates520R and 520R2 520RE 220rpm Continuous tubingElements Performance curves Page Page Page 6mm wall tubing for 520R pumpheads Tubing and element part numbersInch Chem-Sure Sta-Pure 4mm wall tubing for 520R2 pumpheadsInch Marprene Bioprene Pumpsil 913.A008.024Sanitary Inch Bioprene TM Sta-Pure 4mm wall elements for 520RE pumpheads102 Accessory Description Part code Pump Compatibility 35 520 series pumping accessories103 Publication history Trademarks104 RGA number Signature Your position Date Decontamination certificate105

520DUN specifications

Watson & Sons 520DUN is a state-of-the-art model that has garnered attention for its exceptional performance and innovative technologies. Designed for agricultural applications, this machine combines durability, efficiency, and ease of use, catering to the needs of modern farmers.

One of the standout features of the 520DUN is its robust engine. Equipped with a high-performance diesel engine, it offers impressive horsepower, allowing it to handle a variety of demanding tasks with ease. This engine is designed for fuel efficiency, ensuring that operators can complete their work without frequent refueling. The powertrain is complemented by an advanced transmission system that enables smooth gear shifts, enhancing operator comfort during long hours of operation.

The 520DUN also boasts a remarkable load capacity, making it an ideal choice for transporting heavy materials. Its rugged build quality ensures that it can withstand the rigors of daily use, providing a reliable solution for farmers and contractors alike. The robust chassis and reinforced components were designed to maintain stability and control, especially when navigating uneven terrain.

Incorporating cutting-edge technologies, the Watson & Sons 520DUN features precision farming capabilities. With GPS integration, operators can efficiently manage their fields, optimizing planting and harvesting processes. This technology not only increases yield but also minimizes inputs, making farming more sustainable and economically viable.

User ergonomics were a significant consideration in the design of the 520DUN. The operator's cabin is spacious and well-equipped with intuitive controls, providing a comfortable working environment. Operators will appreciate the advanced display panel that offers real-time data on performance metrics, fuel consumption, and maintenance reminders. This allows users to keep the machine in peak condition and react to any issues promptly.

Safety is also paramount in the design of the 520DUN. It features reinforced safety measures, including roll-over protection systems and visibility enhancements, ensuring operator safety during operations.

In summary, the Watson & Sons 520DUN represents the pinnacle of agricultural machinery with its powerful engine, remarkable load capacity, precision technology, and ergonomic design. It is tailored for those who seek reliability and efficiency in their agricultural endeavors, making it a noteworthy choice in today's competitive market.
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