LRF-3000S Ultrasonic Transit-time Flow meter
4
1.
Product Overview
1.1.
Introduction
LRF-3000S is a wall-mount, clamp- on type ultrasonic flow meter which uses the transfer time technology. Clamp
on type ultrasonic flow meter is easy to install and no need to cut off the pipe that saves you lots of troubles and
cost. At the same time LRF-3000S has our unique calculate software to ensure the high accuracy and low velocity
response.
LRF-3000S ultrasonic flow meter widely application in oil industry, water treatment, pure water, chemical and
etc.
LRF-3000S could add the RTD model and temperature sensor become an energy meter to monitoring the energy
use, help to save the energy.
1.2.
Features of LRF-3000S
Comparing With other traditional flow meter or ultrasonic flow meter, it has distinctive features such as high
precision, high reliability, high capability and low cost, the Flow meter features other advantages:
1.
With ARM COMA chip, low power consumption, high reliability, anti-jamming and outstanding benefits.
2.
User-friendly menu designed. Parameters of pipe range, pipe material, pipe wall thickness, output signals, etc
can be conveniently entered via the windows. British and Metric measurement units are available.
3.
Daily, monthly and yearly totalized flow: Totalized flow for the last 64 days and months as well as for the
last 6 years are may be viewed. With the SD Card, 512 files can be stored; the time interval can be within 1
second.
4.
Parallel operation of positive, negative and net flow totalizer with scale factor and 7 digit display. Internally
configured batch controller makes batch control convenient.
The flow meter ensures the higher resolution and wider measuring range by the 0.04ns high resolution, high
linearity and high stability time measuring circuit and 32 bits digits processing program.
1.3.
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
•
=
2
sin
Remarks:
V
Medium Velocity
M
Ultrasonic frequency of reflection
D
Pipe Diameter
θ
The angle between the ultrasonic signal and the flow
T
up
Transit time in the forward direction
T
down
Transit time in the reverse direction
ΔT = T
up
– T
do
Downstream Transducer
Upstream Transducer
Flow
D
T
down
T
up
