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1.5.2. Design
The block diagram of flow meter AFLOWT BUF M of BUF-310 ver-
sion is shown in Fig.3.
Fig.3. Block diagram of flow meter
The BUF-310 flow meter consists of a primary converter (CP) and a
secondary converter.
The primary flow converter is a pipeline section (pipe section with
pipe connections for PEA installation and flanges for pipe connection)
with two PEAs installed on it (Fig.A.1 of Appendix A).
The PEA operates in two modes: radiation, when the electrical pulse
signal from the secondary converter is converted into ultrasonic vibra-
tions, and reception, when the ultrasonic vibrations of the liquid are con-
verted into an appropriate electrical signal.
The secondary converter contains a processing module that acts as
a meter and calculator as well as a display module. The processing mod-
ule controls the electro-acoustic sounding, processes the measurement
signals from the PEA and performs the secondary processing of the
measurement information and ensures the storage of the measurement
results.
External communications of the flow meter are provided by means
of universal and logic outputs available on the processing module as well
as optional RS-485 serial interface modules, M-Bus interface or Wireless
M-Bus interface installed in the processing module.
The measuring information is displayed on a graphical liquid crystal
display (LCD) located on the display module. LCD provides output of two
lines of alphanumeric information at 16 characters per line. The infor-
mation output is controlled by means of an optical button located on the
front panel next to the LCD.
