thermocouple tester

[desrob]

i have a thermocouple tester it comes in handy on the job, but when testing the type of thermoccouple with a lead coming from the bottom of thermocouple and another coming from were thermocouple is connected to the gas valve,what mv am i looking for to determine if ok,...50mv.????

 

[mikegas]

25-30 mv open circuit test

12-15 closed circuit test

 

[desrob]

25-30 mv open circuit test

12-15 closed circuit test

how can establish that the thermocouple is faulty or ok,while heating the tip i took a reading of leads and i got 50mv,am i to assume that it is ok even if it is a little higher than what you are saying

 

[Billy Bob Bob]

never used my thermocouple tester 99% time its easier to stick a new thermocouple in,after all you have to disconnect one end to use the tester and if after fitting the new thermo the pilot still wont establish the gas valve (or hl stat if fitted) is knackered

 

[mikegas]

never used my thermocouple tester 99% time its easier to stick a new thermocouple in,after all you have to disconnect one end to use the tester and if after fitting the new thermo the pilot still wont establish the gas valve (or hl stat if fitted) is knackered

i just stick a new one in to test as well

 

[desrob]

never used my thermocouple tester 99% time its easier to stick a new thermocouple in,after all you have to disconnect one end to use the tester and if after fitting the new thermo the pilot still wont establish the gas valve (or hl stat if fitted) is knackered

the leads of this thermocouple plug into a pcb, and it looks like thermocouple comes as a complete piece oxy pilot etc,obviously i'll try the oxy pilot assembly first but i've got a feeling this one could run on ..i'm getting sick of fires they seem nothing but trouble for little reward.

 

[gasmarc]

I never change a thermocouple unless it a quick swap . the price of some of these old one is well expensive

 

[desrob]

I never change a thermocouple unless it a quick swap . the price of some of these old one is well expensive

if i am getting 50mv is it ok to use and the fault must be some were else

 

[gasmarc]

if the pilot light is not staying on it could be a blocked injector , or the over heat stat if there is one fitted or the gas valve unlightly i would have thought

 

[desrob]

if the pilot light is not staying on it could be a blocked injector , or the over heat stat if there is one fitted or the gas valve unlightly i would have thought

on this model the thermocouple leads go into a pcb,so it could be that aswell,if i'm getting 50mv would suggest the thermocouple is fine and the problem is else were

 

[gasmarc]

i think you would have to check the MI . To avoid an expensive mistake perhaps

 

[Billy Bob Bob]

on this model the thermocouple leads go into a pcb,so it could be that aswell,if i'm getting 50mv would suggest the thermocouple is fine and the problem is else were

what is it your working on?thermo leads in to a pcb? HL stat on there or flue stat?(ttb)

 

[desrob]

what is it your working on?thermo leads in to a pcb? HL stat on there or flue stat?(ttb)

it's a legend vantage gas fire, just priced the pcb nearly 200 quid

 

[gasmarc]

ouch that is one you dont want to make a mistake on ,good luck