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April 2004
1-4 Features and Capabilities
Electronics Package
The TransPort consists of circuits that generate, receive, and
measure the travel time of the ultrasonic pulses. It also contains a
microcomputer that controls operation and calculates flow
measurement parameters. Specific circuits function as follows:
A. TRANSMIT SIGNAL GENERATOR - The transmit signal
generator, under control of the microcomputer and timing
circuit, synthesizes the signal that drives the transmitter.
B. TRANSMITTER - The transmitter amplifies the signals from
the transmit signal generator to a signal that drives the
transmit transducer.
C. RECEIVER - The receiver amplifies the received signals to a
level suitable for the data acquisition circuitry.
D. DATA ACQUISITION - The data acquisition circuitry
digitizes the received signal and stores it in a buffer for
processing by the microcomputer.
E. TIMING CIRCUIT - The timing circuit generates the
transmitter frequency, receive window, controls the data
acquisition circuit and the direction of the transmission.
F. MICROCOMPUTER - The microcomputer controls the
TransPort flowmeter’s operation and calculates flow
measurements derived from the transmitted and digitized
received signals. Also, the microcomputer continually checks
for faults and allows the use of built-in diagnostics for
troubleshooting.
G. INPUT/OUTPUT - The input/output circuitry allows the
flowmeter to indicate the measured flow with the
0/4 to 20-mA current loop, and to output to a printer or other
remote device.