SL1188P Ultrasonic transit-time flowmeter
Revision
：
2.0.0
Page 51 of 81
8.
Product Overview
8.1.
Introduction
The Flowmeter PORTABLE Ultrasonic Liquid Flow Meter consists of a flow sensor (two ultrasonic transducers),
a flow transmitter and a Personal Digital Assistant (TPC).
The Model Flowmeter PORTABLE Ultrasonic Flowmeter is a state-of-the-art universal transit-time Flowmeter
designed using SLSI technology and low-voltage broadband pulse transmission. While principally designed for
clean liquid applications, the instrument is tolerant of liquids with the small amounts of air bubbles or suspended
solids found in most industrial environments.
8.2.
Features of Flowmeter
Easy data acquisition and processing. By using the TPC data acquisition and processing program of the Flowmeter
PORTABLE, you can perform data acquisition and processing conveniently. Using the TPC, you can also perform
such operations as browsing the collected data, making statistical analysis, displaying graphs, etc. The PC
applications of the Flowmeter PORTABLE make it even easier to implement the above operations or print data
tables.
With distinctive features such as high precision, high reliability, high capability and low cost, the Flowmeter
features other advantages:
Low consumption power, high reliability, anti-jamming and outstanding applicability.
Clear, user-friendly menu selections make Flowmeter simple and convenient to use.
U.S., British and Metric measurement units are available. Meanwhile, almost all-universal measurement units
worldwide may be selected to meet customer
’
s requirements.
Daily, monthly and yearly totalized flow: Totalized flow for the last 64 days and months as well as for the last 5
years are may be viewed.
You can be convenient to use the high capacity memorized SD card for long time data logging on the scene.
Clear, user-friendly operating interface. The fully-windowed software supplied with this instrument allows users
to set parameters or types easily, including British or Metric measurement units, pipe size, pipe material, wall
thickness, fluid type, output signal, etc. The setup guide of the TPC makes it more convenient for users to
configure the setup parameters, display settings and output settings. Instead of memorizing a large number of
commands, you can complete these configurations simply by following the instructions on the screen. Different
settings can be saved as different files that can be recalled easily.
Power on/off function: allows the viewing of time and flow rate as power is switched on and off 64 times. Also,
the Flowmeter has manual or automatic amendment during offline sessions.
Self-contained signal output, including relay, open collector, frequency and 4~20mA current loop analog outputs,
etc.
Parallel operation of positive, negative and net flow totalizes with scale factor (span) and 7 digit display, while the
output of totalize pulse and frequency output are transmitted via relay and open collector.
8.3.
Theory of Operation
When the ultrasonic signal is transmitted through the flowing liquid, there will be a difference between the
upstream and downstream transit time (travel time or time of flight), which is proportional to flow velocity,
according to the formula below.
down
up
T
T
T
MD
V
•
∆
×
=
θ
2
sin
Remarks:
V
Medium Velocity
