Regarding pressure thermometers?
Thread Content
A pressure-type thermometer consists of a bulb, a capillary tube, and a Bourdon tube pressure gauge. It generates pressure in a sealed space due to the volume expansion of the temperature-sensitive fluid. The longer the capillary tube in a pressure-type thermometer, the slower its response time. Is this true? I believe that the length of the capillary tube in a pressure-type thermometer has no relation to its response time. Is that correct? I would appreciate guidance from those with more expertise.
Its temperature measurement principle relies on the volume expansion of the temperature-sensitive fluid, which generates pressure in a sealed space; the transmission of this pressure is independent of the length of the capillaries, so I agree with the original poster’s view
A pressure-type thermometer detects signals by utilizing the expansion or changes in pressure that occur when a liquid, gas, or steam inside a sealed container is heated. Based on the working medium used, pressure-type thermometers can be classified into liquid-type, gas-type, and steam-type. The longer the capillary tube in a pressure-type thermometer, the slower its response time. This statement is correct; although liquids have very low compressibility, the length of the capillary tube still affects the instrument’s response time.
Agree with the opinion from Floor 4: time:
What was said on the 4th floor is right; there should still be some impact
I think the longer the capillary, the lower the accuracy of the measurement!
Although there is an impact, it is almost negligible. It’s really tough for the original poster; such behavior is very rare in the market these days.
The transmission of pressure should have nothing to do with volume or length.
Theoretically, there is no impact, but in practical use it can still cause lag in the instrument.