Siemens SITRANS FC410, Руководство по эксплуатации, Страница: 27 / 160

Description
3.4 Features
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
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3.4 Features
● The SITRANS FC410 can be used as Modbus slave in stand-alone or parallel operation
on Modbus or third party automation systems
● Compact sensor design
● NAMUR conforming sensor built-in lengths (on request)
● High immunity against process noise
● Fast response to step changes in flow
● High update rate (100 Hz) on all process values
● Measurement of:
–
Massflow
– Volumeflow
– Density
– Process media temperature
● Independent low flow cut-off settings for massflow and volumeflow
● Automatic zero-point adjustment (initiated by host system)
● Process noise damping using digital signal processing (DSP).
● One totalizer for summation of massflow. The totalizer is reset on loss of power.
● Empty pipe monitoring
● Simulation of process values:
–
Massflow
– Volumeflow
– Density
– Process media temperature
● Troubleshooting and sensor checking
● Use in hazardous locations according to specification
3.5 Theory of operation
The Coriolis principle of measurement
The flow measurement is based on the Coriolis law of motion. Particles moving in a rotating /
oscillating system will resist imposed oscillations in a manner consistent with their mass and
velocity (momentum). Oscillation produced by a Coriolis flowmeter where the process media
is accelerated around bends results in phase distortions of the measuring tubes.
The SITRANS F C sensors are energized by an electromagnetic (voice coil) driver circuit
which oscillates the pipes at their resonant frequency. Two pickups are placed symmetrically
on either side of the driver to provide position signals for digital processing.