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WIKA Operating Instructions - Ultrasonic Flowmeter FLC-UFL
81500908.01 08/2020 EN
EN
4. FLC-UFL Series description
4. FLC-UFL Series Product description
4.1 Principle of operation
The FLC-UFL series ultrasonic gas flowmeters operate according to the transit time difference measurement.
Measured ultrasonic signal transit times t
up
and t
dn
are defined by the sound and gas velocity. Gas velocity V is proportional
to the difference between the signal transit times. Changes in the sound velocity caused by pressure or temperature
fluctuations do not affect the calculated gas velocity with this measurement method. The FLC-UFL series ultrasonic gas
flowmeter calculates the volume flow rate based on the gas velocity and the Flowbody internal diameter.
4.2 System components
4.2.1 Signal Process Unit
The Signal Processing Unit (SPU) consists of a mainboard
that contains all the electronic circuits for operation of the
unit. In addition to the mainboard, two additional boards
can be placed for extra functionality such as pressure and
temperature sensor interfaces and additional Input/Output
interfaces. The mainboard interfaces to the transducers
and controls the complete measuring process. All interfaces
are intrinsically safe, except the USB service port.
4.2.2 Flowbody
The Flowbody is used to install the FLC-UFL series
flowmeter in the pipeline. It is available in various pipe sizes,
pressure ratings and flange types.
2
1
3
4
5
1
SPU
2
SPU nameplate location
3
Meterbody nameplate
4
Eyebolt
5
Meterbody
The FLC-UFL series comprises of a Signal Processing Unit
(SPU), Flowbody with transducers, nameplate with essential
information and eyebolts for lifting purposes.
