VorTek U44 Series, Инструкция по эксплуатации

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Series U44 Instruction Manual
M-000-00090
7
1. Product Overview
1.1 Introduction
This product is a portable, clamp-on type ultrasonic flow meter using transfer time technology. The clamp-on
type ultrasonic flow meter is easy to attach and has no need to cut off the pipe, which saves you a lot of
trouble and cost. At the same time, this flow meter has our unique calculation software to ensure high
accuracy and low velocity response.
This ultrasonic flow meter is applicable to the oil industry, water treatment, pure water, chemical, etc.
The ultrasonic flow meter could add an RTD model and temperature sensor to become an energy meter for
the monitoring of energy use.
1.2 Features of the Ultrasonic Flow Meter
When comparing this flow meter with other traditional flow meters or ultrasonic flow meters, it has
distinctive features including high precision, high reliability, high capability, and low cost. The flow meter
features other advantages:
1. With ARM chip, low power consumption, high reliability, anti-jamming, and outstanding benefits.
2. User-friendly menu design. Parameters of pipe range, pipe material, pipe wall thickness, output signals,
etc. can be conveniently entered via the menus. US 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 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. An internally
configured batch controller makes batch control convenient.
The flow meter ensures a higher resolution and wider measuring range by the 0.04 ns 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:
Remarks:
V Medium velocity
M Ultrasonic frequency of reflection
D Pipe diameter
θ 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
down
down up
T T
T MD
V
•

 =

2 sin
Downstream Transducer
Upstream Transducer
Flow D
T
down
T
up