why do fluids go up a capillary tube
Capillary tubing introduces a response time lag in the instrument reading. This delayed reaction time is influenced by: Length of the capillary tube Internal diameter of the capillary tube Control volume of the pressure-sensing instrument Viscosity of the fill fluid, including temperature effects fill fluid viscosity The control volume of a pressure-sensing instrument such as a gauge or transmitter is defined as the change in volume required to deflect the bourdon tube or sensing diaphragm from zero to 100% reading.