Global Process Automation Market (2013 – 2018) august 2014 | Page 17

by the unit. This transit time is calculated from the sensor to the target and back to the sensor.
Applications that may have steam, foam, or high variances in the concentration of the process
material generally do not use ultrasonic level transmitters. Low radio frequency is used in the
capacitive units. These units are used to measure the conductivity of current in a closed circuit.
Level of the application proportionally varies the current in the closed circuit. Capacitance is a
function of the dialectic constant of the fluid, the

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