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Pitot heater - current sensor

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johnt(at)comp-sol.com
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Posted: Fri Nov 24, 2006 7:43 am Post subject: Pitot heater - current sensor

Bob,



Say - I noticed diagram PitotHeat.pdf on your website...



This seems like a slick low cost way to know if your pitot heater is actually drawing current.



Could I also use this for a fuel boost pump?



Do you have a picture of a finished unit and how you would wrap the wire around it, heat shrink, etc?



Thanks,



John

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nuckollsr(at)cox.net
Guest

Posted: Fri Nov 24, 2006 8:02 pm Post subject: Pitot heater - current sensor

At 09:38 AM 11/24/2006 -0600, you wrote:



 	  Quote: 	
		  Bob,



Say - I noticed diagram PitotHeat.pdf on your website...



This seems like a slick low cost way to know if your pitot heater is 

actually drawing current.



Could I also use this for a fuel boost pump?



Do you have a picture of a finished unit and how you would wrap the wire 

around it, heat shrink, etc?



Thanks,



John


	


  I've not published any specifics on utilizing reed-switches

  as current sensors. They're used in MANY similar applications

  on our production airplanes. Light ON says system IS powered

  and IS drawing current.



  Reed switches come in lots of sizes and sensitivities.

  Get a 275-232 reed relay from Radio Shack. Remove

  existing excitation coil and rewind with 22AWG for up

  to 10A circuit and 16AWG for up to 20A circuit. Find

  minimum number of turns that will close the relay contacts

  when your electro-whizzie is powered at about 10 volts

  (end of battery life).

http://www.aeroelectric.com/Pictures/Misc/CurrentSense.jpg



http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf



  I've considered packaging calibrated current sensors

  either with reed switches or perhaps more sophisticated

  electronics . . . but the reeds are simple, inexpensive

  and reasonably rugged after installation. You'll need

  to be gentle on these things while working with them.

  After the design is fixed, consider "potting" the

  werks in hot-glue.



  For individual loose reed capsules check out



http://tinyurl.com/yfb3rf



http://mpja.com/productview.asp?product=7459+SW



http://www.goldmine-elec-products.com/prodinfo.asp?number=G13078



http://www.goldmine-elec-products.com/prodinfo.asp?number=G13997



http://www.goldmine-elec-products.com/prodinfo.asp?number=GP57



   It takes some experimentation but the simple-ideas that

   support the invention are sound. We've been doing this

   in GA aircraft for decades.



   Bob . . .

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