ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Thought this was funny
by Ronny - 12/03/20 06:08 PM
From an outsider- How does tipping work?
by gfretwell - 12/02/20 02:38 PM
Happy Thanksgiving
by Trumpy - 12/02/20 04:11 AM
Where is Everyone?
by Trumpy - 12/02/20 03:51 AM
What does your work place look like?
by Trumpy - 12/02/20 03:42 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
1 registered members (Ronny), 25 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
thermocuople test #51760 05/09/05 02:34 PM
Joined: Oct 2004
Posts: 26
Z
zero76 Offline OP
Member
I'm wondering how i can test a thermocouple and a uv flame sensor with a DMM. I've got both on a seed dryer that i'm trying to troubleshoot. I'm meeting the gas man down there tomorrow to look at it together. Any help?
Thanks in advance.

[This message has been edited by zero76 (edited 05-09-2005).]

Work Gear for Electricians and the Trades
Re: thermocuople test #51761 05/09/05 07:49 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
I know nothing about the flame sensor...but, for the TC...

A TC works by generating a small voltage, in proportion to it's temperature. This voltage can only be generated if there is a sharp change from one materiel to another. Over time, this 'seam' degrades.
First check the TC fo continuity. If good, than check for a steady voltage between the leads. If the voltage fluctuates, or the meter cannot seem to settle on a value, then the TC is probably bad. Ditto if the read-out on a TC meter bounces all over the place.

Re: thermocuople test #51762 05/09/05 08:24 PM
Joined: Oct 2004
Posts: 26
Z
zero76 Offline OP
Member
thanks for the reply, So if i understand correctly: if i remove it from the ckt. it generates it's own voltage? what approximate value would it read? It's a type J tc.

BTW i can spel thermocouple but i couldn't figure out how to change the topic in edit mode. z.

[This message has been edited by zero76 (edited 05-09-2005).]

Re: thermocuople test #51763 05/09/05 09:21 PM
Joined: May 2001
Posts: 376
F
frank Offline
Member
I believe it's called Constantin or something like that and a typical furnace thermocouple used to generate 15mv and drop the gas valve coil out around 5mv.This was ten years ago on older furnaces,now LEDs flash a code.The tip should be cleaned of soot with steal wool when testing/suspecting or even seeing one IMHO.

[This message has been edited by frank (edited 05-09-2005).]


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
RH1
RH1
California
Posts: 22
Joined: August 2009
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 20
Popular Topics(Views)
272,207 Are you busy
206,095 Re: Forum
194,097 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3