10
SFIDK.PS.028.S2.02
3.5
Mode of operation
The flow measuring principle is based on coriolis law of movement.
The flowmeter consists of a sensor type FC300 and a transmitter MASS 6000.
The FC300 sensor is energized by an electromechanical driver circuit which oscillates the pipe
at its resonant frequency.
Two pick-ups, 1 and 2, are placed symmetrically on both sides of the driver. When liquid or gas
flows through the sensor, the coriolis force acts on the measuring pipe and causes a pipe
deflection which can be measured as a phase shift on pick-up 1 and 2. The phase shift is
proportional to the mass flow rate.
The amplitude of the driver is automatically regulated via a „Phase Locked Loop“ to ensure a
stable output from the two pick-ups in the region of 80 to 110 mV.
The temperature of the sensor is measured by a Pt1000, in a Wheatstone configuration (4-wire).
The flow proportional signal from the two pick-ups, the temperature measurement, and the driver
frequency are fed into the MASS 6000 transmitter used for calculations of mass flow, volume
flow, fraction flow, temperature, and density.
Содержание SITRANS F C MASSFLO
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