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Thermocouple wire near ignition harness

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vicster(at)netvigator.com
Guest

Posted: Sun May 21, 2006 2:12 am Post subject: Thermocouple wire near ignition harness

Hello,

 

I am thinking of routing the thermocouple wires to the ungrounded EGT and

CHT probes along side the ignition harness. I do recall reading in a

previous message that the sensors have a low impedance and do not require

shielding. My installation manual doesn't caution against tying the TC wires

with the ignition harness, but I know of one manual that does. Can I firstly

tie the TC wires along side the ignition harness, and secondly does it need

to be shielded even though the probe is of the ungrounded type. 

 

Thank you

Vic

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Sun May 21, 2006 8:49 pm Post subject: Thermocouple wire near ignition harness

On May 21, 2006, at 3:01 AM, Vic Yerevanian wrote:



 	  Quote: 	
		   

 <vicster(at)netvigator.com>



 Hello,



 I am thinking of routing the thermocouple wires to the ungrounded  

 EGT and

 CHT probes along side the ignition harness. I do recall reading in a

 previous message that the sensors have a low impedance and do not  

 require

 shielding.


	


That is true.



 	  Quote: 	
		   My installation manual doesn't caution against tying the TC wires

 with the ignition harness, but I know of one manual that does. Can  

 I firstly

 tie the TC wires along side the ignition harness, and secondly does  

 it need

 to be shielded even though the probe is of the ungrounded type.


	


If you are using an ungrounded type of thermocouple that is usually  

because the instrument maker opted to save money on the device and  

not use a differential input. Still, one side of the thermocouple  

should be grounded in the instrument which will protect against any  

high-voltages induced in the TC wiring.



And no, no shielding is necessary.



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

 Antoine de Saint-Exupry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

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