Answer / aftab ahmed mazari

I agree with Mr. Satyendra Bhai Patel suggestions.
More over please check followings:
1. May be some electric motor starts and its cable routing
is near to your extension cable.
2. Also get check thermocouple,some time,its hot juction
got open and close with the passage of time. Replace
thermocouple.
3. Check loose connections.
4. Check thermocouple any wire being grounded at some time.
5. Any how, do not megger thermocouple extension wire.
Check it with normal multimeter.
aftabmazari@yahoo.com

Answer / satyendra bhai patel

check cable is screened or not ? i think this type of
problem occures when a little bit induction in wire .so
just screen your cable in indicator s terminal.problem will
be solved .
For more details u can contact me on 9005091827

Answer / rana mujahid

I agree with all above answers but I think the most chances
are may be TC hot junction is some time going to open and
close..........need to replace TC

Answer / sreedhar

Just Replace T/C

Answer / abhishek

please check instrument cables are earthen or not with
screened cables.this things only happens when wires are cut
at gland side or terminations are loosed

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