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Pitot heat relays

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flylists(at)dbarrett.net
Guest

Posted: Wed Feb 10, 2010 7:35 am Post subject: Pitot heat relays

I've been looking at relays for pitot heat and landing lights, and have

found several that look to me like they might work. 20A should be sufficient

but the 40A version has mounting tabs to secure them behind the panel.  Here

are representative specs:



http://www.azettler.com/pdfs/az977.pdf

http://www.azettler.com/pdfs/az973.pdf

http://www.azettler.com/pdfs/az9731.pdf

http://www.azettler.com/index.php?id=electromechanical_relays_other2



Are there specific things I should be concerned about when specifying relays

for this application? Is a sealed relay recommended in the cockpit?

Resistors/diodes across the coil are available but not generally in stock.

(I can add the diode if necessary here.) The cost is < $2 in single units

from:

http://www.onlinecomponents.com

http://www.onlinecomponents.com/buy/AMERICAN-ZETTLER/AZ9731-1A-12DC1/

They have a $35 minimum order, but I'm sure I can find other things to fill

out the order.



David Barrett

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sprocket(at)vx-aviation.c
Guest

Posted: Wed Feb 10, 2010 9:42 am Post subject: Pitot heat relays

These are standard automotive relays.  If you don't want to place the 

minimum order, pick one up at your favorite auto parts store.

I use devices that have internal resistors (or diodes) because it saves a 

bit of wiring-- but have 14 of them in my aircraft [another long topic about 

switch failures vs relay reliability].



You can also purchase relay sockets that make installation a bit easier, if 

you wish.



Vern Little

Vx Aviation



--------------------------------------------------

From: <flylists(at)dbarrett.net>

Sent: Wednesday, February 10, 2010 7:26 AM

To: <aeroelectric-list(at)matronics.com>

Subject: Pitot heat relays



 	  Quote: 	
		   



 I've been looking at relays for pitot heat and landing lights, and have

 found several that look to me like they might work. 20A should be 

 sufficient

 but the 40A version has mounting tabs to secure them behind the panel. 

 Here

 are representative specs:



 http://www.azettler.com/pdfs/az977.pdf

 http://www.azettler.com/pdfs/az973.pdf

 http://www.azettler.com/pdfs/az9731.pdf

 http://www.azettler.com/index.php?id=electromechanical_relays_other2



 Are there specific things I should be concerned about when specifying 

 relays

 for this application? Is a sealed relay recommended in the cockpit?

 Resistors/diodes across the coil are available but not generally in stock.

 (I can add the diode if necessary here.) The cost is < $2 in single units

 from:

 http://www.onlinecomponents.com

 http://www.onlinecomponents.com/buy/AMERICAN-ZETTLER/AZ9731-1A-12DC1/

 They have a $35 minimum order, but I'm sure I can find other things to 

 fill

 out the order.



 David Barrett


	


 	  Quote: 	
		  

 Checked by AVG - www.avg.com

 07:35:00

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pestar

Joined: 11 Apr 2007
Posts: 61
Location: Auckland, New Zealand

Posted: Wed Feb 10, 2010 1:07 pm Post subject: Re: Pitot heat relays

Vern



What manufacturers relays are you using where the diodes are built in?



Thanks

Peter Armstrong

Auckland, New Zealand

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Thu Feb 11, 2010 6:19 am Post subject: Re: Pitot heat relays

Both Digikey and Mouser have diodes and relays.  Search their websites for this part number: G8JN-1C6T-F-DC12 made by Omron.  It has a metal one-hole mounting bracket and is weather proof.  Here is the data sheet:

http://www.components.omron.com/components/web/PDFLIB.nsf/0/39018354E59A56C985257201007DD68C/$file/G8JN_0607.pdf

I thought it interesting that the normally open contacts have a higher current rating than the normally closed contacts, maybe because magnetism closes contacts quicker and tighter with less bounce than a spring does.

Joe

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_________________
Joe Gores

dfritzj(at)yahoo.com
Guest

Posted: Thu Feb 11, 2010 6:55 am Post subject: Pitot heat relays

I got mine from Waytek. I think they were Bosch.



Dan

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pwmac(at)sisna.com
Guest

Posted: Thu Feb 11, 2010 9:02 am Post subject: Pitot heat relays

Ford uses N2 filled, diode internal relays used for the glow plugs. A 

handy source. I would have to check, but I bet NAPA sells the 

identical part for less $$??

Paul

========

At 06:19 AM 2/11/2010, you wrote:

 	  Quote: 	
		  



Both Digikey and Mouser have diodes and relays.  Search their 

websites for this part number: G8JN-1C6T-F-DC12 made by Omron.  It 

has a metal one-hole mounting bracket and is weather proof.  Here is 

the data sheet:

http://www.components.omron.com/components/web/PDFLIB.nsf/0/39018354E59A56C985257201007DD68C/$file/G8JN_0607.pdf

I thought it interesting that the normally open contacts have a 

higher current rating than the normally closed contacts, maybe 

because magnetism closes contacts quicker and tighter with less 

bounce than a spring does.

Joe



--------

Joe Gores





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 85935#285935

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sprocket(at)vx-aviation.c
Guest

Posted: Thu Feb 11, 2010 2:11 pm Post subject: Pitot heat relays

Here's what I'm using:  Digikey 255-2161-ND

They have the built-in resistors.



Standard automotive type.  Not having to wire in the diodes/resistors is a 

big bonus.  Also, the coils are polarity insensitive when using resistors 

rather than diodes, if that matters.



Vern

--------------------------------------------------

From: "pestar" <peter(at)reivernet.com>

Sent: Wednesday, February 10, 2010 1:07 PM

To: <aeroelectric-list(at)matronics.com>

Subject: Re: Pitot heat relays



 	  Quote: 	
		   



 Vern



 What manufacturers relays are you using where the diodes are built in?



 Thanks

 Peter Armstrong

 Auckland, New Zealand





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=285873#285873






	


 	  Quote: 	
		  

 Checked by AVG - www.avg.com

 07:35:00

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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