Need 2000 psi sender to measure gear system pressure?

[kevineldredge]

Best recommendation for use with my SV ems system?

 

[Rhino]

The EMS itself doesn't measure pressure, so you'd just need to determine what pressure sensor would give you the correct voltage range for whatever widget or indicator you plan to use. Are you planning to actually display a pressure measurement number, or just create a go/no-go indicator when it's at the proper level?

 

[kevineldredge]

Thank you. I actually have a UMA sender that will give me a 5 volt range, I guess I assumed you must have the sensor "map" in SV? Can I create my own map for a sender to display value on SV?

 

[jakej]

Although you have a 0-5 volt output is the sensor you have rated for 0-2000psi ?

 

[Rhino]

Thank you. I actually have a UMA sender that will give me a 5 volt range, I guess I assumed you must have the sensor "map" in SV? Can I create my own map for a sender to display value on SV?

Generally speaking, yes. There may be some limitations and other considerations, which I think is what Jake was getting at. You can start looking on page 7-84 of the install manual for more information, though I imagine your particular situation is going to require some serious tinkering. For example, though you may have a 2,000 PSI sensor, you may not actually be looking for 2.000 PSI as a good indication. That's a huge range to indicate with just 5 volts. It may be some other number in that range you're looking for. So, you'll have to decide if you want an actual PSI reading, or simply a go/no-go indicator. You likely won't get an accurate PSI reading with a range of just 5 volts. Either way, you have to decide what voltage equals those amounts, and configure your EMS widget to use that number. It can get pretty complicated. There's more steps after that, and likely a lot of trial and error.

 

[GKC Aviation]

You likely won't get an accurate PSI reading with a range of just 5 volts

I use some Honeywell MLH series sensors on an AirTractor that give pretty precise pressure indications on the 5000psi hydraulic system using 0-6 volts. These, by the way, look exactly like the Kavlico sensors.

 

[jakej]

OK - try this Honeywell MLH02KPSB06A = 0 - 2000 psi. you'll find a data sheet.
There are 6 output options & 1 is 1-5volt - I'm going to try 1 on a Glasair in the next 2-3 months.

 

[Rhino]

I use some Honeywell MLH series sensors on an AirTractor that give pretty precise pressure indications on the 5000psi hydraulic system using 0-6 volts. These, by the way, look exactly like the Kavlico sensors.

Yes, the sensor may be accurate, but a little widget on your screen may not give a very accurate picture. It's a wide range of pressure being depicted with a small range of voltage. A change of 100 psi is only represented by a quarter of a volt, assuming it's linear. Small changes will be harder to see, and it doesn't take a lot to influence minor voltage in aircraft wiring. If all you're looking for is a comfortable margin above a certain point, you should be fine. But if you want accurate pressure readings, it could get more complicated.

 

[jakej]

My musings - is to maybe make up a 'rig' using a calibrated gauge & the MLH sensor, inject ~5 volts into the sensor power (connect the ground of course) & measure the output volts at the particular psi for say the 'green' range, you could also work out other 'range' points. Then set up your widjet ? seems simple or I could be smoking too much stuff

 

[Rhino]

That's what I was thinking, so maybe we're smoking the same stuff.

 

[djones]

We have this one already characterized in the sensor file. If you use another one, you will have to have a custom sensor file.