Opinion

[Bruce of MN]

I only knew of Bourdon tubes being for pressure, but maybe for temperature, too.

https://mechlesson.com/bourdon-pressure-gauge/

 

[Y-Blockhead]

I only knew of Bourdon tubes being for pressure, but maybe for temperature, too.

https://mechlesson.com/bourdon-pressure-gauge/

You maybe correct, I may be mixing up my terminology. I thought gas filled temperature gauges used a Borden (Bourden) tubes in the gauge. When the gas expands in the bulb, the Bourden tube straightens and moves the needle.

 

[Y-Blockhead]

I only knew of Bourdon tubes being for pressure, but maybe for temperature, too.

https://mechlesson.com/bourdon-pressure-gauge/

You maybe correct, I may be mixing up my terminology. I thought gas filled temperature gauge used a Borden (Bourden) tubes in the gauge. When the gas expands in the bulb, the Bourden tube straightens and moves the needle.

 

[Bruce of MN]

There are glycerin (and other liquids) filled and sealed temperature instruments. They work because the liquid is incompressible and passes any volume increases from being heated directly on to the Bourdon tube. A gas filled system would just compress the gas and not pressurize the tube as much.