We have installed more than 10 of these on Fuel/Oil delivery trucks. These are mainly expensive new delivery trucks and we must stand behind them - so far no problems at all. We have supplied our own rectangular magnets to fit our purpose better: 1/8" x 1/4" x 1/2" that we install in an existing keyway, or we mill a 1/4" keyway into an accessible part, then epoxy in place. The sensor is installed in an existing part by drilling and tapping a 12mm x 1.0 thread (tap purchased from McMaster-Carr), or we fabricate a bracket and use the double nut method. The magnet must have North & South on the big flat side, and South must be out. We buy the magnets from K&J Magnetics (Part# B842), and they have a nice little iPhone and Android app available for identifying North and South. If the app gets confused, the magnet is probably not "pole"ed correctly. The wiring colors make it less than perfect for hooking it up, but the diagram included is correct. The tach reads 1 to 1: 1 magnet sensed = 1 full turn. No setup or programming required.
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This item: DIGITEN 4 Digital Red LED Tachometer RPM Speed Meter + Hall Proximity Switch Magnet Sensor NPN for Lathe Conveyor Belt
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Just What I Needed
Saw a lot of questions on this tach so I thought I would review it and hopefully answer some of the many questions but before I get too far along remember the old adage "You get what you pay for" most of the time. This is a very inexpensive device, something you could pay several $100 for if it were a laboratory grade piece of electronics so keep that in mind if you buy one.The Review:I needed an RPM meter for a grinder I am building on the CHEAP. It will be a 2x72 belt grinder made mainly from a couple of used treadmills. I am using the treadmill motor to drive the belt and needed to know the speed of the belt so I figured a tach on the motor shaft would give me a good idea of belt speed. Bought this inexpensive kit and am very well pleased with it. If it had had some wiring instructions(pic attached) I would have given it 5 stars. I deducted a star for having to figure it out myself. I am powering it with a 9VDC AC-DC converter that plugs into a wall receptacle, one of the little devices that power our calculators and laptops, charge our phones etc. They are commonly referred to as "WALL WARTS". I have about 20 of the things thrown in a box form over the years. This one is "rated" at 9VDC at 210ma(mili amps). Some of the pics show it hooked up to two meters and the tach kit. If you look at the meters closely you will see that the digital is reading 11.87VDC, the no-load voltage for this WW(wall-wart) is 13.2DC by my measurement. Electronics folks will understand this but for the non-electronics folks, when the power supply is loaded the voltage drops, per the rating data if it had a 210ma load it would drop to 9VDC. That brings me to the actual load, note the old analog meter, it is set on the 60mili amp scale and is reading about half scale or about 30mili amps. That means that the tach kit is only loading the WW to ~30ma there by only dropping the output voltage to the 11.87VDC Based on this the minimum rated WW could be as low as 9VDC at 50ma, a very small WW indeed. The take away here is that most any 6-9VDC WW would do the job. I am saying 6-9 and not 8-15 because of the low loading effect the tack has on the WW power supply. I say start with 6 because I have four 6VDC WWs and all of them show a no-load voltage of 8VDC or more. One of my 12VDC WWs has a no load voltage of 17.8VDC. You would not want to apply that much voltage to this unit. Check out the pics for answers to other questions such as how to wire it up.Finally I highly recommend this and the similar other color tachs for non-critical applications. Great inexpensive hobby stuff.
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- Reviewed in the United States on September 9, 2024
- Reviewed in the United States on August 25, 2022
- Reviewed in the United States on March 7, 2016
It works fine and everything was as advertisedI bought this for my Logan lathe. It works fine and everything was as advertised. The wiring diagram was correct and easy to follow. The unit requires 9-15 volts DC but it does not mention how much current the power supply has to supply. I first used a 9V battery with clip leads and it worked fine with the provided magnet. However with a 15V 200mA power supply, the magnet wasn't strong enough. So I ended up using a 9V 300mA power supply and it works fine. I just had to mount the magnet very close to the sensor. I used an ABS plastic sleeve with a counterbore and glued the magnet in. Then glued the sleeve to the spindle on my lathe. I was going to zip tie it on, but the zip tie interfered with the sensor.
Reviewed in the United States on March 7, 2016
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- Reviewed in the United States on November 13, 2024
- Reviewed in the United States on December 10, 2024
- Reviewed in the United States on July 26, 2019
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hmwh1357Reviewed in Japan on April 30, 2023
コストパーフォーマンス高い！
ネオジュウム磁石は高速の回転体に取付けるので固定用のビス穴があるほうがいいですね！私は別途センター穴の開いた磁石を別途調達しました。コストパーフォーマンス高い！hmwh1357
Reviewed in Japan on April 30, 2023
追伸：動作確認したところ表示器の数字が0のままで確認したところ写真の雲マークの4本足の素子が半田不良で外れてました。半田をやり直すと無事表示しました。
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