Geo :
The bulb mounted in the Tstat housing contains a very volatile liquid (which
I believe is diethyl ether), whose vapor pressure is proportional to it's
temperature. The gauge is then basically a pressure gauge that reads the
vapor pressure. Since the vapor will condense (giving off considerable
heat) if it touches a cooler surface, the entire capillary tube (and the
guts of the gauge) wind up being heated very close to the same temperature
as the bulb. (This is the same principle used to cool sodium filled exhaust
valves.)
Randall
59 TR3A
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Geo Hahn
> Sent: Wednesday, September 29, 1999 1:47 PM
> To: TR
> Subject: Re: TR3 Temp Gauge
>
>
>
> This from someone who believes they understand how television
> works & has a
> rudimentary grasp of what the 4th dimension would be like...
>
> It occurs to me that I really don't know how the capillary
> tube/temp gauge
> works. Does coolant actually flow up to the gauge? If so,
> wouldn't it be much
> cooler when it got there? Or does the tube itself conduct
> the heat? I give
> up....
>
> Geo Hahn
> 59 TR3A
>
>
|