the sensing element is connected to the process by pipe work and flexes in proportion to the pressure. the process side of the sensor sees the pressure to be measured while the other side is connected to a reference pressure. the pt can be used to calculate the flow rate through a pipe. many process chemicals will destroy the internals of a pt. the pt is mounted on the other side of the seal. this makes the sensor distort and give a false pressure reading. the sensing diaphragm on which the liquid pressure acts must be kept clean.
the instrument sets up an electric field between the probe and the tank wall using the contents of the tank as a dielectric (a nonconductor that allows an electric field to exist within itself). the position of the change is detected and represents the level of the tank contents. the electric field is set-up between the two probes or the probe and the metal strip. as the level of the tank contents change so does the electric charge between the probe and the wall. (they are not suited to gases) the medium in which the probe sits must not conduct electricity through itself else a short circuit occurs between the probe and wall and prevents the electric field developing. when used to measure the level of solids there must be sufficient moisture content within the solid. the rods are brought to-length and the necessary length must be advised to the supplier.
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