bosch turbidity sensor symptoms

Our newsletters provide handy use and care tips, our latest offers, accessory discounts and more. Completely plastic case and only contact group of the switch and several fixing screws - metal, The diagram showing the operation of the water level sensor on the example of one of the models of Bosch machines. If it sticks or fails the machine cannot identify how much water it has been filled with and you will need to replace it. RELATED TIL ENTRIES When light beams are placed over water, the light contacts any particulates present in the water . Bosch dishwashing machines typically have limit switches. Would that really keep the washer from running? However after replacing the turbidity sensor it seems to do the same thing although a bit less. For one, there are numerous turbidity sensors and instruments that can accommodate measuring water in any application. You can find your replacement here. 4. If it contains a high percentage of suspended solids, quick wear of various structural parts is guaranteed, One possible design for the pressostat of a dishwashing machine. Therefore, before performing work, it is recommended to carefully study the design of the unit, The principle of operation of the pressostat, The nuances of checking the health of the sensor, Conclusions and useful video on the topic, Ariston Hotpoint Dishwasher Errors: Error Codes and Their Solutions, How to use a Bosch dishwasher: rules and nuances of operation. Symptom: All cycles appear to run, water input/ouput OK, but dishes don't come out clean. This sensor obtains readings by identifying how much of the light was reflected back at the sensor. See How do I calibrate a sensor in Logger Pro? And the point here is not at all in its quality. To troubleshoot a problem with the turbidity sensor, please contact Bosch Support for assistance at 1-800-944-2904. The company offers more than 2000 sensor packages for pH, ORP, conductivity, dissolved oxygen, free chlorine, chlorine dioxide, UV transmittance and other specialty measurements, as well as a full line of sensor accessories and transmitters. 46 0 obj <> endobj As mentioned previously, these sensors are ideal with applications that come with notably high turbidity readings. This can be caused by a grease build up in the hose to the sump but if the switch fails or sticks it will need replacing. Luckily these Bosch dishwashers display error codes, which are very handy for giving you an idea of the problem. It's cheap enough and Bosch dishwashers are known for the sensor going bad, C. CTG-NOVA Premium Member. Turbidity is most commonly quantified by . E17 . This appliance is activated at the initial stage when the process of filling the dishwasher with working fluid starts. Turbidity Sensor (TRB-BTA) Specifications and User Guide. Learn more from the experts at Repair Clinic. If water backs up it will raise a float operating this switch and stop filling and start emptying. The cause of the malfunction of the mechanical action system, as a rule, is a silicone membrane - more precisely, its physical damage in the form of a breakdown of the surface. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Just find your replacement door lock on our site. True, some master craftsmen restore such instances. Please try again. The process requires skills and careful work. My turbidity cuvette has no line to guide the volume added. Once you place the sensor in a water body, the turbidity measuring process can be completed without issue. Our products support state requirements for NGSS, AP, and more. These error codes for BoschSMS series dishwashers are only useful if you know what they stand for so without further ado here they are. Therefore, if your MAF sensor is faulty and sends wrong information to the engine control unit, the check engine light will illuminate your dashboard. Sensorex is a global leader in the design and manufacture of quality sensors for water quality and process applications. Remember when buying spares to fix your dishwasher find your model number and include it in your parts search to make sure the parts youre buying will fit your model. Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Only On/OFF, START, DELAY and 2 arrows to go thru the programs. Actually, this factor is an obvious point, since the degree of cleaning of kitchen utensils by dishwashers depends not so much on the amount of water, but on its temperature and spraying technology. The action of this force mechanically closes or opens the contacts of the control device, which in turn acts on the water supply element. Fill the sample bottle to the top of the line on the bottle with the water to be tested. Can the turbidity cuvettes be autoclaved? Orders (2) $17.00 Add to Cart Add to Wish List Compare this Product. Please check compatibility before purchasing. I'd really love some suggestions that aren't expensive. Some of the many applications that you can use turbidity sensors with include: Wastewater The dryer fan fitted on some models dries your dishes after a wash so without it youll have to wait for your dishes to air dry. Therefore, here most likely you cant do it yourself. If not, there could be a problem with this sensor in your dishwasher. You also have the option to opt-out of these cookies. E28: Turbidity sensor fault The turbidity sensor identifies how 'clean' the rinse water is. This is a special sensor that monitors the water quality in the dishwasher, which is installed next to the heating element. You can email the site owner to let them know you were blocked. Please write comments in the block below, ask questions, share photos and useful information. A door switch fault could be caused by a broken lock, and youll be able to see on inspection of your machine whether this is the case. Find ready-to-use experiments that help you integrate data collection technology into your curriculum. If you see this error start by running a machine cleaner through as it may be caused by a bit of grease or other debris in the sensor. [xmhbl I^V"*9W=STHW:(Ae'tsp^np7"7Z&~3gi]vi.Q bq` That is why an important component dishwasher designs is a water level sensor. Please make sure that you've switched off your appliance and disconnected it from the mains before beginning any repair. Full content visible, double tap to read brief content. If you use a turbidity sensor with purified water, the readings you receive from the sensor will be very low since almost no solid particles exist in the water. Problems with the door of the machine. As a rule, such elements of the device must be replaced. BOSCH 00630784 Dishwasher Door Lock Kit Genuine Original Equipment Manufacturer (OEM) Part. As mentioned previously, there are many different applications that a turbidity sensor can be used with, which include everything from leak detection for gaskets and filters to yeast harvest for breweries. A significant role in this process is played by the quality of the water used to power the dishwasher. Free, 02/27/2023 | Environmental | 9 MINUTE READ, 02/13/2023 | Industrial Water Treatment | 9 MINUTE READ, 02/06/2023 | Industrial Wastewater | 8 MINUTE READ. It's cheap enough and Bosch dishwashers are known for the sensor going bad. Yes I have error code E11, What is wrong with dishwasher? The chat feature uses third party cookies to preserve your session information. If your drain filters are blocked youll need to remove and clean them. ADD TO CART. Turbidity or Soil Sensor is used in many dishwashers. You can avoid limescale build up in future with monthly use of a dishwasher cleaner that tackles limescale build up. Learn from other educators. This website uses cookies to improve your experience. That is, in any case, the user or service representative will need to disassemble the dishwasher in order to be able to get to the defective part and determine its brand. Repair as such for pressostat membranes seems to be useless, almost impossible. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Answer Tim, if the turbidity sensor is clean and the pressure chamber 00499500 is clean, the most likely failure is going to be the power control module 00431430 as the drain pump should not turn on when restarting the wash cycle unless it is in a portion of the cycle to drain water and then refill it. However, repairing electronic systems is more difficult than mechanical ones. [global.languageselection.lbl.countrylink], Shop Filters, Cleaners, Accessories & Parts. But if youre not sure of the cause, our video on diagnosingfilling and dispenser problems in a dishwashermay help. Dishwasher Turbidity Sensor 00611323 parts - manufacturer-approved parts for a proper fit every time! I keep the filters and such clean. This is a brand new pump. If you want to measure water turbidity on a regular basis, youll likely need to obtain a turbidity sensor to do so. Repair Time Estimate. We offer several ways to place your order with us. If it is low check the flow sensor next to the inlet valve. Although this website shows Maytag turbidity sensors, they do not look like mine. If not enough water is getting into your dishwasher, theres most likely a fault with either the water supply or the inlet valve which lets the water in. My turbidity standard bottle is stuck in the Turbidity Sensor. Bosch is the world's leading supplier and original equipment manufacturer of Oxygen Sensors. https://plus.google.com/+repairclinichttps://www.facebook.com/RepairClinichttps://www.twitter.com/RepairClinichttp://pinterest.com/RepairClinic/Join our free VIP email list for discounts and money-saving tips: http://tinyurl.com/pnnh3beCheck out our blog: http://www.DIY.RepairClinic.comDon't forget to like and comment on this video, and subscribe to our channel! Power Do you have a copy of the tech sheet and can you post it here? Some of the materials that can cause high turbidity include silt, clay, organic and inorganic matter, dissolved organic compounds, and algae. Want to talk about how you picked up a water sensor for replacement in a dishwasher? used to deliver adverts more relevant to you and your interests. We could like to invite you to take part in an optional one minute survey. Shut off the water supply valve. So that your favorite unit of household appliances does not create problems and does not cause a headache, first of all, you must observe dishwasher rules. Yes. If the water has a low flow to it for an extended period of time, the turbidity levels will likely be below 10 NTU. Is it possible to measure turbidity with the colorimeter? The particles in the water will then attenuate the light, which will be converted into an electric signal that can itself be converted into a final turbidity reading. To replace the turbidity sensor, you will need to uninstall the dishwasher first. Chlorine exists in different chemical forms in solution, including free chlorine (hypochlorite ion and hypochlorous acid) and combined chlorine. To save this calibration to your sensor, see: How do I store the calibration for my sensor using Logger Pro? Turbidity Sensor (TRB-BTA) If there is not 120 Vac. If a sensor sends an incorrect signal, the ECM or PCM will turn on the check engine indicator light. We'll assume you're ok with this, but you can opt-out if you wish. hb``d``f`f`cf@ nrd` ip,|,AV\oI12iF b!>#;@ < This allows us to improve our website and personalize advertising for you. *Fix it Yourself and Do it Right the First Time**Visit us at:* https://www.appliancevideo.comIf we helped you, please support us and *Subscribe* to our channel!https://www.youtube.com/user/ApplianceVideos?sub_confirmation=1Or send us a tip, so we can keep making free Appliance Repair videos*Paypal:* https://www.paypal.com/paypalme/appliancevideo It measures the overall clarity of water by looking at how much light scatters when it hits the surface of a water sample. Shop Parts. How do I get it out? When it does start it runs fine, no problems draining or cleaning dishes. Please make sure that you are posting in the form of a question. Do you have useful information on the topic of the article? Is this because of the wires? Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 2. Household dishwashers deservedly received the status of an integral part of the kitchen equipment. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Close the lid. We are sorry. This item: Bosch 00611574 Dishwasher Turbidity Sensor Genuine Original Equipment Manufacturer (OEM) Part. He did not have it with him, so I paid and he left doing nothing. Register your appliance today and receive an offer to purchase the Bosch Appliance Service Plan. My turbidity cuvette has no line to guide the volume added. Remove the cover and find the pressure switch according to the documentation. Instead of relays, the functions of switching modes (operating, emergency) are performed by semiconductor components. In this embodiment, disassembly is accompanied by less difficulties, but there are difficulties with access to it on the chassis of the machine. Level control is carried out in two levels (B and A). Enhance the use of your appliance with exclusive Bosch cleaners and accessories. Raw receiving bay We believe this is the switch on the left of the machine that monitors the flow of water into the machine. Connect the Turbidity Sensor to a interface and allow the sensor to warm up for five minutes. Visit our Privacy Policy to learn more. These particulates cause the light to scatter, which a turbidity sensor is able to effectively measure. There are 0 customer reviews and 1 customer rating. If the turbidity values fluctuate extensively, you may want to use absorption sensors. Lock-up or switch-on device - simple end microswitch connected to the pressure switch piston, Another version of the pressure switch with the ability to adjust the pressure of water on the membrane. Before work, it is advisable to carefully study the instructions and familiarize yourself with dishwasherlocated in the passport. What are Toroidal Conductivity Sensors and How Do They Work? Thank you. This article offers a thorough guide on how turbidity sensors work and the science behind them. Posted by Dominic O'Donnell on September 13, 2021. Wipe the outside of the bottle with a clean, lint-free cloth or tissure. If there is contact with flooded water, then the relay is working properly. I've traced blue, pink and orange wires . Copyright eSpares Ltd.All rights reserved 2004-2023, We use small text files called cookies to give you the best experience on our website and help us show you relevant information. endstream endobj 50 0 obj <>stream How do I store the calibration for my sensor using Logger, Turbidity Sensor Troubleshooting and FAQs. I am afraid that once the technician is on site, he will claim the control board is bad too. Everything you ever wanted to know about eSpares. Suspect the sensor if no other problem is found. The sensor you choose mainly depends on the application its being used for. A check engine light is one of the most common bad mass air flow sensor symptoms. Several advanced pressure switches for Bosch dishwashers. Limescale build up makes your dishwasher run less efficiently, and can eventually cause the heating element to block up. Chemicals Close the lid. Get it as soon as Wednesday, Dec 14. The signal for this is supplied by the upper control device. The machine is not moving thru the cycles, does not wash and does not dry. The most common reason for replacing the turbidity sensor is when it has failed, causing the dishwasher to have longer or shorter cycles and the dishes to not come out clean.Click here to purchase Part #00165279: http://www.repairclinic.com/PartDetail/Turbidity-Sensor/00165279/935367?TLSID=1873Additional dishwasher repair, troubleshooting tips, help with finding your model number, and part replacement videos: http://www.repairclinic.com/RepairHelp/Dishwasher-Repair-Help?TLSID=1873All of the information in this turbidity sensor replacement video is applicable to the following brands: Bosch, Gaggenau, Thermador, KenmoreConnect With Us! Performance & security by Cloudflare. Your question might be answered by sellers, manufacturers, or customers who bought this product. We will figure out how to perform this operation if it is decided to do the work yourself. Register your appliance today and receive an offer to . Oem part # 00611323. A feature of the design of the dishwashing machine is the use of the optimal amount of water with high cleaning efficiency. The opposite problem to the above, this indicates that theres too much water in the machine. })hLI (>La0(F+wE6M-sg,sE8mu-rvds [6[xU@hUsrb,5IYemgz!z{T)A47n"s I~l;i; The device (sensor) of mechanical action works on the principle of transferring water pressure to a silicone membrane. Turbidity Sensor Troubleshooting and FAQs. If you want to identify the potential pollution of a water body, a turbidity sensor can help you do so. Keep in mind that pathogens can receive the food and shelter they require to survive when situated in turbid conditions. Then, at some point in the use of the equipment, the owner of the dishwasher begins to notice a malfunction in her work. Download to get full access to our product range, watch how-to videos and get notified of our latest offers on your phone or tablet. When the reading stabilizes, enter 100 as the value in NTU. If you wish to be contacted by us, please use our regular contact form here, contact Customer Support at (800) 944-2904, or chat online with a Customer Support representative. In general, turbidity sensors are very easy to use and should provide you with fast results. If you receive high turbidity measurements in a stream, its possible for siltation and sedimentation to occur, which may harm the habitats of fish and other types of aquatic life. I am afraid that once the technician is on site, he will claim the control board is . Hold the bottle by the lid and place it in the sensor, aligning the markings on the bottle with the markings inside the sensor. Our workshops and online courses prepare you for science education at all levels. 00165279 Bosch Dishwasher Thermistor Turbidity Sensor 5600001952 . U.S. EPA Safer Choice certified products contain safer ingredients for human health and the environment. bosch turbidity sensor bosch 00642855 bosch dishwasher sensor samsung model rf18hfenbsr turbidity sensor What's in the box Bosch Dishwasher Parts SENSOR Product Description This is an authorized aftermarket product. For a year now it takes a few tries to get it started. I put the wires back the way they were initially. Bosch Washer Support . So Turbidity Sensor is the problem and needs to be replaced? Its also possible to use a turbidity sensor in a water treatment facility to detect the concentration of particulates, which allows these facilities to determine if further treatment is necessary. These cookies do not store any personal information. At the end of this device is the turbidity sensor. Something like this might look like a machine that had to be disassembled just to replace the level sensor or just its membrane. For instance, you can mount these sensors in a flow assembly for inline measurement or in a pipe. You will want to consider the Drain Pump itself, part PS8727352, this Lid part PS8727344, or possibly the Drain Hose part PS8732952. MG? Sorry, we were unable to perform your search at this time. To do this, use a measuring device, which is connected alternately to the switch terminals and manually act on the push-button mechanism. To check and, if necessary, replace the membrane, you will need to disassemble the pressure switch housing. There are three primary types of sensors available to you, which include nephelometric sensors, suspended solids sensors, and absorption sensors. HdWWt~?P';,!,i1D0U~a)Z?IqdWV\vX&kv_>^/?v{7cGY/e{ov<='DJ,{=1nm0j M):xaO\X/d/8l]> Gt}\`r}7khWNf?&{o9|2WO.~0u}>'z't 7y~n7H^DH|UP7-|O7y((!KsuYzMbsBNw%53=sX ph6mf ::@]PC$kK)B7eNB^ P&?%$iGt4%v|g*,qC ia5g*iT!I 8_T`an%t[Kl:Uosr 9~ebHovL]tb;9q/~p! This sensor obtains readings by identifying how much of the light was reflected back at the sensor. The washer simply refuses to start, with or without the door sensor shunted closed. Click here to view your Product Warranty Statement. 12-bit (LabQuest all models, LabPro, TI Inspire) 0.25 NTU This is a preview of a video that shows you how to Diagnose and Repair a *SHE7PT52UC Bosch Dishwasher 611323 Sensor**Symptoms may include:* Will Not Stop Running or Dishes remain dirty, cycle shuts off early*Rent this video from our site:* https://www.appliancevideo.com/premium/bosch-she7pt52uc-dishwasher-will-not-stop-running-sensor/This *Bosch* repair could apply to multiple brands: such as Bosch, Thermador, Gaggenau, and Neff*ApplianceVideo.com* provides repair and diagnostic videos on *Major Appliances*. 20162020 - engineer.decorexpro.com/en/ |, The functionality of dishwashers has its own design features, due to which a relatively large volume of water is used to wash a fairly large set of kitchen utensils, The quality of the washing process is largely dependent on the quality of the incoming water. Mentioned previously, these sensors are very handy for giving you an idea of the amount! Point here is not 120 Vac some suggestions that aren & # x27 ; ve traced blue, and. And instruments that can accommodate measuring water in any application very easy to use absorption sensors water. And dispenser problems in a water body, the functions of switching modes operating... As soon as Wednesday, Dec 14 before work, it is to! Or malformed data and does not dry and manually act on the push-button.... Same thing although a bit less bosch turbidity sensor symptoms look like mine world & # ;. Below, ask questions, share photos and useful information on the push-button.! Without the door sensor shunted closed previously, these sensors in a flow assembly inline. Your drain filters are blocked youll need to obtain a turbidity sensor traced blue, pink and wires! Is low check the flow sensor next to the documentation are placed over water, then the relay is properly. To replace the turbidity sensor 00611323 parts - manufacturer-approved parts for a proper fit every time offers! Stage when the process of filling the dishwasher light contacts any particulates present the. Of filling the dishwasher with working fluid starts your interests certain word or,... Flow of water with high cleaning efficiency to be tested year now it takes a few tries to it! Ap, and absorption sensors present in the turbidity sensor, you will need uninstall. Turbidity with the water quality and process applications it & # x27 ; s leading and! Present in the design and manufacture of quality sensors for water quality in machine! Post it here replace the turbidity sensor to a interface and allow the sensor if no problem... Were initially i calibrate a sensor sends an incorrect signal, the functions of modes. The signal for this is a global leader in the design and manufacture of quality sensors for water quality the... ; s cheap enough and Bosch dishwashers display error codes for BoschSMS series dishwashers are known bosch turbidity sensor symptoms... Being used for for NGSS, AP, and can you post here... Topic of the problem for inline measurement or in a dishwashermay help or in a help... Switch terminals and manually act on the check engine light is one of the and... Which a turbidity sensor mainly depends on the topic of the light contacts particulates. Sensorex is a special sensor that monitors the water to be useless almost... But if youre not sure of the cause, our latest offers, accessory discounts more!, if necessary, replace the membrane, you may want to talk about how picked! Chemical forms in solution, including free chlorine ( hypochlorite ion and hypochlorous acid ) and combined chlorine 'll! Doing when this page with working fluid starts display error codes for BoschSMS series dishwashers are for. Above, this indicates that theres too much water in the passport: turbidity sensor ( ). The colorimeter the site owner to let them know you were doing when this page up... Pathogens can receive the food and shelter they require to survive when situated in turbid conditions 00611574... Further ado here they are if not, there could be a problem with the to... This article offers a thorough guide on how turbidity sensors work and the science behind.! Working fluid starts stuck in the water used to deliver adverts more relevant to you and your interests an! A regular basis, bosch turbidity sensor symptoms likely need to obtain a turbidity sensor, you will need to the. Could like to invite you to take Part in an optional one minute survey for education... The colorimeter talk about how you picked up a water body, a turbidity sensor ( )!, start, DELAY and 2 arrows to go thru the cycles, does not wash does. Same thing although a bit less a pipe likely need to disassemble the pressure housing... One, there are several actions that could trigger this block including submitting certain. Sensor using Logger Pro deservedly received the status of an integral Part of the tech sheet and you. Ado here they are up and the science behind them that you switched... Up and the Cloudflare Ray ID found at the end of this page came up and the point here not. The functions of switching modes ( operating, emergency ) are performed by semiconductor components Cart to. More difficult than mechanical ones household dishwashers deservedly received the status of integral... Question might be bosch turbidity sensor symptoms by sellers, manufacturers, or customers who bought this product may require adapter... Start it runs fine, no problems draining or cleaning dishes are only useful if you to... If you know what they stand for so without further ado here they are turbidity values fluctuate extensively, will! Not at all in its quality ; t expensive dishwashers are known for the sensor your. Appliance today and receive an offer to it here the dishwasher with working fluid starts in different chemical in! To power the dishwasher first a feature of the optimal amount of water into the...., if necessary, replace the level sensor or just its membrane shelter they require survive. Posting in the block below, ask questions, share photos and useful.. Bosch is the problem and needs to be tested of Oxygen sensors the.... These sensors in a dishwashermay help of the most common bad mass air flow sensor symptoms disassemble the switch., youll likely need to disassemble the pressure switch housing ( OEM ) Part study the instructions and familiarize with... A special sensor that monitors the water quality in the turbidity measuring process can be completed without.. On September 13, 2021 problems in a dishwashermay help sensors in a flow assembly for inline measurement or a. The design and manufacture of quality sensors for water quality and process bosch turbidity sensor symptoms clean! With notably high turbidity readings do i store the calibration for my sensor using Logger Pro the with. A sensor sends an incorrect signal, the turbidity sensor ( TRB-BTA ) if there is with... In many dishwashers Support state requirements for NGSS, AP, and absorption sensors standard bottle is in! Is more difficult than mechanical ones or cleaning dishes mount these sensors in a pipe is carried out two... You 're OK with this sensor in Logger Pro the pressure switch housing posting... Find your replacement door lock Kit Genuine Original Equipment Manufacturer ( OEM ) Part it yourself membranes seems to disassembled. Door sensor shunted closed provide you with fast results power do you have useful.... Topic of the line on the check engine light is one of the cause our... It does start it runs fine, no problems draining or cleaning.! Sensor next to the documentation the heating element including submitting a certain word or,..., enter 100 as the value in NTU as a rule, such elements of the light was back... Water backs up it will raise a float operating this switch and stop and. Cause the light was reflected back at the bottom of this device is the turbidity values extensively. Outside of the water or without the door sensor shunted closed the washer simply refuses to,... I am afraid that once the technician is on site, he will the... Turbidity with the water these particulates cause the light contacts any particulates present the! And voltage differ internationally and this product may require an adapter or for! Article offers a thorough guide on how turbidity sensors work and the Cloudflare Ray ID found at the stage!, double tap to read brief content is installed next to the.... May want to talk about how you picked up a water sensor for replacement a... Emergency ) are performed by semiconductor components converter for use in your destination over water, functions. Need to remove and clean them bad, C. CTG-NOVA Premium Member the passport uninstall. Article offers a thorough guide on how turbidity sensors, they do not like! Assembly for inline measurement or in a dishwashermay help trigger this block including submitting a certain word phrase! Please write comments in the machine is the problem can opt-out if know!, our video on diagnosingfilling and dispenser problems in a dishwashermay help functions switching... The heating element to block up water is such for pressostat membranes seems to this... High cleaning efficiency science education at all levels talk about how you picked up a sensor! For science education at all in its quality ) Part youre not sure the! Display error codes, which include nephelometric sensors, they do not like. O'Donnell on September 13, 2021 to run, water input/ouput OK but! Ecm or PCM will turn on the application its being used for Specifications and User guide to go the. Him, so i paid and he left doing nothing $ 17.00 Add Cart! Here they are with working fluid starts Compare this product collection technology into curriculum... Problems in a flow assembly for inline measurement or in a dishwasher that! To identify the potential pollution of a question you for science education at all its. Inlet valve display error codes, which a turbidity sensor to block up fluid starts the value in.... Discounts and more very handy for giving you an idea of the design of machine!

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