DIGITEN 4 Digital Green LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN

中古の籾摺り機を購入しましたが、回転計が壊れたため、交換用に購入しました。 回転表示部は、ほぼ同じ大きさで四隅をやすりで少し削るだけで簡単に取付ができました。 センサー部は、配線が短く細いため、既存の配線と接続に手間取りましたが、何とか取付できました。

Ho acquistato questo contagiri per completare la mia fresa a controllo numerico. occorre fare attenzione ai collegamenti del sensore di hall perché se alimentato al contrario si brucia. Il magnete in dotazione non è particolarmente potente, volendo una distanza di misura di 5 o 6 millimetri ho usato al suo posto un N50 rettangolare 10x5 mm. Attenzione al fissaggio perché un magnetino da un grammo se messo in rotazione a 10000 giri produce una forza centrifuga di diverse centinaia di grammi e schizza via e può far male.

Good product. Works well and appears very accurate

Dies ist schon der zweite Tacho, den ich in meine Maschinen eingebaut habe, lief alles bisher sehr gut.Die Spannung zur Versorgung ist so variabel, daß sie mit der Ausgangsspannung meiner 2 VFDs (Lenze und Parker) ohne Probleme betrieben werden kann. Der Anschluss ist denkbar simpel. Bei dem Sensor muss man nur drauf achten, daß der Magnet recht direkt am Sensor vorbeizieht (max 1mm). Ein stärkerer Neodyn-Magnet hat da bei der kleinen Maschine geholfen, auf der grösseren ist der Radius der Welle grösser, und man kann den Magneten besser positionieren. Ich wollte keine 4 Wochen warten, deswegen die deutsche Bestellung, 4 Tage sind OK, dafür gebe ich gerne etwas mehr aus.

This is a solid budget tachometer which comes with everything you need to properly measure RPM. I would say the only downsides are if you can't use the included L bracket to mount the sensor, and you must affix a magnet. For my use case, this was going onto a milling machine I was converting to run on a VFD with a modern controls system. I wanted to have an accurate tachometer, so I knew what the spindle speed was. This has worked well. Here's a tip when installing this. Power it up and before you install the magnet, move it over the sensor. If you don't get a reading, flip the magnet and retest. Mark the side which needs to be affixed to whatever you're trying to measure the RPM of, so that you ensure you keep the magnet orientated properly. I didn't do this and unfortunately it didn't work, so I had to break the adhesive loose, and redo it. I wish the magnet was marked out of the box so you knew this up front. I'm not going to knock it down, but I do wish this had a wider voltage range of say 8-26V. I am running a 24VDC control system and had to use a small 24 -> 12 volt step down converter to power only this tachometer. That was my oversight and there are other similar devices available with a wider voltage range. Other than it hanging onto the RPM for a bit after the spindle stops, I've found it to be quite reliable and accurate. The camera shutter speed is what causes the display to be difficult to photograph, but in person it's easy to read with no issues.