Is it possible to use a inductive sensor for rpm measure? Like this one
Okay thanks. Like this one?
Why I'm asking you about this is because l need a sensor in range of m4-m10 so it will fit the brake. so l can't use your sensor.
Do you know where l can buy a good sensor ?
Ok. I'm gonna use it inside the water brake as they do originally! It's a old dynamite 9" straight vane absorber.
If l remember correct it will be 12 teeth per revolution and the material is aluminum! That should work?
I think this one Will be perfect But do you know if l should use use no, nc or nc+no for the sensor?
For that sensor I think the npn is the correct type. It was a bit hard to judge from the picture ;-).
For the original sensor there must be magnets embedded in the aluminium, no sensor senses alu that I know of. But double check that it really is 12 of them. You should calculate the number of pulses per second, it should be minimum 200. For 12 triggers per revolution it means that it will work fine over 1000RPM. It works below too, but then you should turn off inertia compensation (normally not super important on an engine dyno).
Alternatively you can do what we did on our water brake, we just added a trigger wheel and the standard RPM sensor. You can see it in the water brake videos in our youtube channel.
Thanks. I'm gonna read more about the sensors but I'm quite sure it will work on aluminum. I have seen a distance chart for another sensor with different kind of materials. and the maximum distance was way lower with aluminum than for steel. So it should work .
I have disassembled the brake so I'm going to check how many vanes it is before I'm put it back again.
I'm going to try and see it it will work before I'm making a trigger wheel.
The RPM sensor should read the brake RPM. You do not need an engine RPM sensor, engine RPM is calculated from the brake RPM and the gear ratio.
You can add an engine RPM sensor or use OBD2 in addition to the brake RPM sensor if you want. This will automatically calculate the gear ratio. All systems need a brake RPM sensor in any case, the brake RPM as the basis for all calculations.