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  #11  
Old 09-02-2021, 09:19 AM
rapid_ascent rapid_ascent is online now
 
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Ok. Then I stand corrected.
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  #12  
Old 09-02-2021, 09:20 AM
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ppilotmike ppilotmike is offline
 
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Default Question for Garmin?? G3X Guy??

Perhaps the G3Xpert will chime in here. I used the Vans capacitance plates setup. Since they are just plates, as Ray said above, they need some sort of electronics to input a voltage across the capacitor and read the output. At the time I built my tanks with capacitance plates, I bought the 5 point set princeton "converters" because I was told by Todd that this would cover all bases, with respect to the EFIS I ultimately decided on. The question for Garmin is "Can the G3X system input a voltage into the plates and provide the reading too, so in effect act as the converter itself?"
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  #13  
Old 09-02-2021, 09:30 AM
rapid_ascent rapid_ascent is online now
 
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It looks like there are more variations of the "probe" than I realized. Some with internal electronics and some that require an external converter module. Either way my original post is in regards to the Vans plates.
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  #14  
Old 09-02-2021, 09:50 AM
FinnFlyer FinnFlyer is offline
 
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I doubt that the Garmin (or any other EFIS product) will accept input from from Van's (or any other passive) capacitor "probes".

I'm saying that because I think a coax cable from the probes to the EFIS will probably have more capacitance than the probes.

That is the reason the capacitance-to-voltage (or capacitance-to-frequency) converters are mounted so close to the probes.

If Princeton converters are not available, there was a guy here that was prototyping capacitance-to-voltage converters. Might want to search for that thread (capacitive fuel senders) and contact him.

Finn
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  #15  
Old 09-02-2021, 10:01 AM
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airguy airguy is offline
 
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I have a pair of the original Van's converters from my wing tanks, if you can't find the Princeton ones.

Princeton converters were superior to the Vans converters, in my opinion, but it's better than none.
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  #16  
Old 09-02-2021, 10:23 AM
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Thermos Thermos is offline
 
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Quote:
Originally Posted by ppilotmike View Post
Perhaps the G3Xpert will chime in here. I used the Vans capacitance plates setup. Since they are just plates, as Ray said above, they need some sort of electronics to input a voltage across the capacitor and read the output. At the time I built my tanks with capacitance plates, I bought the 5 point set princeton "converters" because I was told by Todd that this would cover all bases, with respect to the EFIS I ultimately decided on. The question for Garmin is "Can the G3X system input a voltage into the plates and provide the reading too, so in effect act as the converter itself?"
I'm not Garmin but I'll chime in anyway. Capacitors (which is what our capacitive plate/fuel dielectric combinations are) block DC. They pass AC in proportion to the value of the capacitor, or in our case, the amount of fuel which acts as the dielectric. That's why we use AC at some frequency to measure fuel level with capacitive plates.

So if I'm interpreting your question correctly, the GEA-24 can provide a limited amount of power through the +5v sensor power line (50 mA, IIRC) but connecting that line to the Van's plates to a converter like your Princeton boxes will do nothing to provide a fuel measurement

HTH

Dave
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Last edited by Thermos : 09-06-2021 at 12:25 PM.
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  #17  
Old 09-02-2021, 10:27 AM
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Walt Walt is offline
 
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You might check with Electronics International, I have the Van's plate installed and they supplied a simple converter to work with their system, no problems in 20 yrs.

From the G3X manual:

For capacitive fuel quantity measurement, a third-party capacitance-to frequency
or capacitance-to-voltage converter is required; the G3X system
does not support direct connection to capacitive fuel tank probes.

Fuel quantity transducers that convert capacitance to a frequency of up to 50 kHz may be used. Examples
of this type of transducer include the Princeton, Vision Microsystems, and EI P-300C units.
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Last edited by Walt : 09-02-2021 at 10:32 AM.
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  #18  
Old 09-02-2021, 10:45 AM
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Thermos Thermos is offline
 
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Quote:
Originally Posted by Walt View Post
You might check with Electronics International, I have the Van's plate installed and they supplied a simple converter to work with their system, no problems in 20 yrs.
Does Dynon still sell converters? They did when I bought my Princeton boxes a few years back.

ds
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  #19  
Old 09-02-2021, 11:41 AM
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MarkW MarkW is offline
 
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If I remember correctly, my Garmin GDU-370 using the Van's plates has the Princeton converters that I bought from Dynon. That was back in 2013.
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  #20  
Old 09-02-2021, 01:42 PM
rapid_ascent rapid_ascent is online now
 
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I think Dynon has their own converter from my searches here on VAF. My impression from before was that these converters were not as accurate as the Princeton, but maybe that is incorrect.
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2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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