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Skysports bendable capacitive probe calibration?

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clivesutton

Joined: 23 Jan 2013
Posts: 187
Location: KENILWORTH

Posted: Wed Jan 25, 2017 6:52 am Post subject: Skysports bendable capacitive probe calibration?

I have fitted the above fuel level sensor into the RH lobe of my fuel tank.  The probe design is the same type sold by Airworld for many years.  



The system already has a 'needle-on-scale' type readout via a VDO-type gauge - but i would also like to connect its signal output on an AUX channel of my EIS4000 engine monitor to display actual figures in Litres



For that to work, the EIS4000 needs a 'scale factor'.  Has anyone done this already - and if so, what SF (and 'offset' value) did you use please?  



I will eventually get some data for my setup during fill/empty cycles - but if you know the approximate voltage outputs from this probe expected at 'empty' and 'full', that data would also be very useful to me at this stage



Looking forward to your replies

Clive Sutton, UK Kit 121

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aspenbuild(at)me.com
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Posted: Wed Jan 25, 2017 10:58 am Post subject: Skysports bendable capacitive probe calibration?

The probes sold by Airworld would not 'talk' to my Dynon and I had to buy genuine ones from an alternative source. Airworld ones look identical but are copies and work in a different way and would only work with their analogue gauges.



Rich S.

CEIW



Sent from my iPad



 	  Quote: 	
		   On 25 Jan 2017, at 14:52, clivesutton <clive.maf(at)googlemail.com> wrote:

 

 

 

 I have fitted the above fuel level sensor into the RH lobe of my fuel tank.  The probe design is the same type sold by Airworld for many years.  

 

 The system already has a 'needle-on-scale' type readout via a VDO-type gauge - but i would also like to connect its signal output on an AUX channel of my EIS4000 engine monitor to display actual figures in Litres

 

 For that to work, the EIS4000 needs a 'scale factor'.  Has anyone done this already - and if so, what SF (and 'offset' value) did you use please?  

 

 If it has not been done already but you know the approximate voltage outputs from this probe expected at 'empty' and 'full', that data would also be very useful

 

 Looking forward to your replies

 

 

 Clive Sutton, UK Kit 121

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=465428#465428

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h&jeuropa

Joined: 07 Nov 2006
Posts: 634

Posted: Fri Jan 27, 2017 1:11 pm Post subject: Re: Skysports bendable capacitive probe calibration?

Clive,



I looked at the Sky Sports website and it appears your probe will output a voltage proportional to the fuel level.  There is apparently a full and empty adjustment screw.  If you are going to continue to use the VDO gauge, measure the voltage at the S terminal of the gauge when it indicates empty and when it indicates FULL fuel.  If they are both less than 5 volts, you can connect directly to your EIS.  If they exceed 5 volts, you will need to make a simple voltage divider with two resistors.



If the voltage is 0 when the tank is empty and 5 volts when the tank is FULL (18 US gal), your SF would be 90 and OFFSET would be 0 using the Forward, Decimal feature of the EIS.  



If your voltages are different or you want other than US gal, I've attached a document that explains how to calculate SF and OFF.  



If you still have questions, please ask.



Jim Butcher

N241BW

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EIS Aux Input Config.docx

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Rick Moss

Joined: 21 Sep 2014
Posts: 96

Posted: Fri Jan 27, 2017 1:38 pm Post subject: Re: Skysports bendable capacitive probe calibration?

Please note that the output of a capacitance sender will differ greatly between Avgas, UL91 and mogas.

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