RPM Sensor

[Pegaz]

Can you confirm if the RPM sensor Honeywell GT1 is compatible with the Skyview. For infomation, this sensor is proposed by MGL. Is that you possibly have another sensor RPM to advise me.
Thank you
http://sensing.honeywell.com/index.php?ci_id=50369
http://www.aircraftspruce.com/catalog/inpages/1105725.php

 

[dynonsupport]

That should work, although it matters how many teeth your gear has. SkyView has a limit of about 200 pulses per second on the RPM inputs. This is enough for 12,000 RPM on a rotary engine, but if you have hundreds of teeth on a gear, even 60 RPM could be an issue.

What are you trying to measure?

 

[Pegaz]

You write "SkyView has a limit of about 200 pulses per second on the RPM inputs"

==> it is 200 pulses per second or per revolution ?.
On our engine (Wilksh Wam100) we have to read 113 teeth on the gear ( 113 pulse per revolution), maximum speed 2800 RPM
So we have 113 X 2800 =316400 pulse/mn ==> 5273 pulse/second !

 

[dynonsupport]

It's 200 pulses per second. This is why I brought this up. Our RPM input is designed to get pulses from things like spark plugs that go off a few times per revolution, not hundreds.

Gear tooth sensors are generally used on things like helicopter rotors that are much slower than the engine. I'm not even sure that sensor itself will work at that speed. Notice the datasheet shows a 3,600 RPM limit on a 4" wheel with 0.5" tooth spacing, which is only 25 teeth. So they may not be able to handle more than 1,500 pulses a second.

I see you have a diesel engine, so no ignition. In these cases, you are better off to try and sense just one pulse per revolution. You can use the same kind of sensor, but instead of detecting gear teeth, you can detect a protrusion on the flywheel. Either a magnet or a bolt that is attached to the flywheel, or a cast-in bump. You can have two per revolution if you want one on each side of the flywheel for balance.

I see the CAD drawing on your site shows some holes in your flywheel- these sensors can also detect those holes. If you have 5-6 holes, you may be able to get away with using that.

 

[Pegaz]

What is included in the setup > Engine information Pul/Rev?example: is the number of teeth of the wheel to be indicates ex 113 teeth?
In my case of the fly wheel, there are 6 holes, or 2800 x 6/60 = 280 pulses / second.
It must pass less than holes to stay under 200 P/s?
If I take 2 holes = 94 P/s max, how to program the set?
Thanks for your help

 

[dynonsupport]

You should set the pulses/rev to how many pulses per revolution your sensor puts out. If you were using a gear tooth sensor, you would set this to 113, if you used a flywheel sensor, you would set it to 6, and if you were using a 2 hole sensor, it would be 2.

We have good news for you though. I had the frequency limit in my head from our previous line of products, not SkyView. SkyView can support up to 160,000 pulses per second. So you can actually use the gear tooth sensor, and just set pulses/rev to 113.

Sorry for the confusion!

 

[Pegaz]

Thanks for the good information, I'll try this weekend and give you news.
We build 2 aircrafts with this diesel engine, and my friend to a Dynon D180. I think that the D180 cannot read 113 teeth but only 6 or 8 maximum?
It is accurate?

 

[dynonsupport]

The D180 is the product limited to about 200 pulses per second. You also can't set the pulses per revolution to a high number like 113.

 

[Pegaz]

We have realized an electronic module to interface between the origin of the Wilksch engine sensor and the SV and it works well with 113 teeth / pulse.
We must now find a solution for the D180.
Thank you for your collaboration.