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How to Use?
Steps
- Attach the magnet to the device you want to test
- Align the Hall sensor to the magnet and connect the sensor to the module
- Connect the module to the power supply, and you can start the test.
Please Notes
- The Hall switch is an NPN normally open switch with a diameter of 12mm;
- The magnet cannot be installed on the metal iron material, it will interfere with the detection;
- Please pay attention to the front and back when installing the magnet;
- Mechanical switches are not recommended.
Description
Features
- The proximity sensor is accurate and the speed measurement is reliable
- High speed measurement range
- It is an AC controller
- It is simple and convenient to install
- It has a long service life
- LED digital screen display
Incorrect Usage and Solutions
- Incorrect Usage: The eccentric turntable shakes up and down when rotating, resulting in inaccurate speed.
- Solution: Replace the eccentric turntable with a circular turntable that rotates along a circular trajectory to ensure accurate speed measurement.
- Incorrect Usage: The magnet is not secured, leading to inaccurate detection.
- Solution: Ensure that the magnet is firmly fixed on a level surface to improve detection accuracy.
- Incorrect Usage: Please do not hold the Hall switch or motor while taking measurements.
- Solution: Securely fix the Hall switch and motor to ensure stable measurements.
Rob
Reviewed in the United States on February 28, 2025
Works awesome on my mill.Response is a little slow but it's good for my application.
Charles m R.
Reviewed in the United States on January 3, 2025
Added two to the 3in1 I picked up used because it didn't have the speed chart for belt arrangement, so these help alot they're really consistent with the results and are easy to install
mcollect
Reviewed in the United States on January 28, 2025
What a great product! BTW to tell if the magnet is in the correct orientation but it under the sensor and the light will go from dull to bright when it is correct. And don't listen to people saying you can't attach the magnet to metal because that is where mine is and it works perfectly
Pat
Reviewed in the United States on August 2, 2024
This tach works great on the lathe. Attaching the magnet to the change-gear end of the spindle lets me know what the true spindle rotation speed is. It is simple to make a small bracket to hold the sensor under the gear cover. I mounted the display on a plastic project box with a small switch for power. I chose this tach because it was AC powered and didn't need an extra power supply. Very happy with this product.
RSW
Reviewed in the United States on July 21, 2024
The product was priced right and looks like it would be a good choice for checking the rpm of a piece of machinery. It is fairly intuitive on how it should be wired but there were no directions included... no specifications for the distance the pickup should be from the magnet, or that the magnet polarity is important for the unit to work. I learn this information from You tube. My unit powered up but didn't read the RPM and just blinked "HHHH" on the read out. I sent it back for a replacement and I am waiting to see if the next unit will work. The good thing is that Amazon has a great return policy.
Ron
Reviewed in the United States on October 16, 2024
It worked fine the first time I used it. The second time I powered it up, it would not count. It just displays HHHH all the time. Tried different speeds, checked all wiring. Will not work now.
nwagh76
Reviewed in the United States on May 15, 2023
Put this on my lathe to monitor speed since the lathe only had a printed dial. I did compare this to another device and it was off by 10 rpm at 1000 rpm speed. For this purpose, more than accurate enough. You will have to figure out how to mount the sensor, and how to mount the unit in a box or panel. Uses 120VAC so do not use it without it being enclosed. Mounting will require some tool capability, but otherwise it is brain dead easy to wire up. More that great for the price!
David P.
Reviewed in the United States on January 29, 2023
I saw this tachometer design in a machinist video. I liked that it uses mains input, in my US location this is 120V but the input can be 240V. The board converts this to whatever DC voltage is needed for the Hall effect sensor and display.I installed the supplied magnet in a balancing hole that was machined into the underside of my quill pulley. A piece of thin scrap wood holds the Hall effect sensor.I could have made a box out of thin plywood, but instead I designed a box and lid in a CAD program and then 3D printed the box and lid. Makes for a nice installation.It takes a few rotations for the sensor to stabilize, but then the display shows a stable reading.I would buy this again.
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