Ron-
If you were using thermal grease long in the past, it may have been a
silicone-based grease. The stuff is notorious for migrating easily, getting
into switch contacts and other places causing malfunctions.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
"Ron Pickard" <[email protected]>@majordomo.ieee.org on 04/28/2003
10:39:27 AM
Please respond to "Ron Pickard" <[email protected]>
Sent by: [email protected]
To: [email protected]
cc: [email protected]
Subject: RE: Thermocouple glue
Hi Brian,
My use of the thermal grease, as I had indicated, was in the past. I have
not used it for a long
time.
But, I'm curious. What were the reasons that these people/entities gave to
you for not using the
thermal grease? Why wasn't it acceptable for them? Surely, they should have
given reasons for their
positions. Please advise. (BTW, I'm not trying to be contentious. I'm just
trying to know their
reasoning)
Best regards,
Ron Pickard
[email protected]
[email protected]
Sent by: To:
[email protected]
owner-emc-pstc@majordo cc:
mo.ieee.org Subject: RE:
Thermocouple glue
04/28/2003 09:55 AM
Please respond to
boconnell
My use of thermal grease was discontinued several years ago by request of
various agency engineers
reviewing test data/technique. And more recently, during my ISO 17025
audit, the NCB auditor
explicitly directed me to never use thermal grease for thermocouple
application. And auditors from
other NRTLs/NCBs have emphasized, at least verbally, that thermal grease is
not acceptable.
R/S,
Brian
From: Ron Pickard [mailto:[email protected]]
Sent: Friday, April 25, 2003 10:19 AM
To: [email protected]
Subject: Re: Thermocouple glue
To all,
I'm surprised that no one hasn't mentioned this yet.
In the past for this application, the securement that I was introduced to
was fiberglass tape and
that white thermal grease. The tape exhibited high thermal stability and
was used to secure the
thermocouples, but left adhesive residue when removed after a temperature
test. The thermocouple was
inserted into the grease which offered excellent thermal conduction from
the measurement point to
the thermocouple. The downside to this grease, as anyone who's used this
grease would say, is that
the grease is "messy to the extreme" and it generally could not be
completely removed from any
surface that it came in contact with. And, it always found a way to get
onto unintended surfaces
including clothing. But, as a plus, the thermal grease would stay put
physically over a very wide
temperature range.
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