Anyone Know About Thermocouples.

[sonofsam 5]

Hey All,

 

Been offered a EGT Thermometer gauge, apperantly it runs on power taken from a Thermocouple Tip?!

Any clues as to what this is and how it may get plumbed into a manifold/exhaust appreciated.

 

Cheers

Sam.

[cybernck 402 1 Cars]

EGT sensors/probes are "K-type", they need a temperature-compensated cable

that runs to a K-thermocouple connector and then you need another connector

to wire it to the gauge.

 

 

check these links out:

 

http://shop.vems.hu/catalog/product_info.php?products_id=53

 

http://shop.vems.hu/catalog/product_info.php?products_id=84

 

 

hope this helps .

[gizzmo 3 1 Cars]

yes they all have a different letter of the alphabet which corrosponds to what the material they made from basically they are two different materials fused together called the junction each different thermocouple sences a temp range rs components have varies types i have seen some glued to the area to be sensed as cybernck has stated cable and connectors important as should corrospond to thermocouple type also from rs. could try maplin too

[sonofsam 5]

Thankyou, very helpfull indeed, its for an anologue guage BTW.

[jonnie205 1]

Yep as said, a thermocouple is simply 2 disimilar metals welded together at the tip, you then (accurately) measure the resistance across the junction at different temps and this corresponds to a calibration and therefore temperature

 

another quick point the tip must be electrically isolated from gnd. otherwise you get a dead short and no resistance to measure...

 

very good for egt but have numerous applications

[sonofsam 5]

Thanks again, also found quite a bit on t'internet about them, guess I'll suck it & see:D

 

So does it seriously just get stuck on to a manifold?!

[tom_m 0]

not on to sam, into. the tip of the EGT needs to be in the gas flow; and on a turbo engine for it to be of any use it needs to be in the gas flow BEFORE the turbo.

[pdd144c 0]

Yep as said, a thermocouple is simply 2 disimilar metals welded together at the tip, you then (accurately) measure the resistance across the junction at different temps and this corresponds to a calibration and therefore temperature

 

another quick point the tip must be electrically isolated from gnd. otherwise you get a dead short and no resistance to measure...

 

very good for egt but have numerous applications

 

You don't measure resistance, RTD's are what you are thinking of. Measuring the milli voltage produced across the two wires will allow you to get a temp reading using a simple calculation.

 

The 'tip' has no need for any kind electrical supply. It needs to be attached in a secure thermowell and be completely touch the end, otherwise you will be getting a false reading.

 

The type of thermocouple used depends on the range of temps you will be measuring....

 

I'm unfortunate enough to have to work with the f***ers most days at work when they go wrong!