Introduction - Echotrek SG-300 Series Installation And Programming Manual

1. INTRODUCTION

Application
The EchoTREK compact ultrasonic level transmitters from NIVELCO are an
excellent tool for the level measurement of liquids.
Level measurement technology based on the non-contacting ultrasonic
principle is especially suited for applications where, for any reason, no
physical contact can be established to the surface of the material to be
measured.
Such reasons may include corrosive attack by the process medium against
the measuring device material (acids), possible contamination (sewage) or
particles of the process medium adhering to the measuring device
(adhesive materials).
Principle of Operation
The ultrasonic level metering technology is based on the principle of
measuring the time required for the ultrasound pulses to make a round trip
from the sensor to the level to be measured and back. The sensor emits an
ultrasonic pulse train and receives the echoes reflected. The intelligent
electronic device processes the received signal by selecting the echo
reflected by the surface and calculates from the time of flight the distance
between the sensor and the surface which constitutes the basis of all output
signals of the EchoTREK
Minimum measuring distance (X
extended by programming in order to avoid disturbing effects of possible disturbing echos coming from fixed objects. (Close-end Blocking).
Maximum measuring distance (X
conditions. The maximum measuring distance of the actual application (H) must not be greater than X
SE/SG-300 series two-wire compact ultrasonic level transmitters
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) is determined by the design of the unit within which the measuremnt is not possible (Dead Zone). This distance can be
m
) is the greatest distance (determined by the design of the unit) which can be measured by the unit under ideal
M
A Total beam angle
of 5°-7° at –3 dB as is featured by most of Nivelco's
SenSonic transducers ensuring a reliable measurement in narrow silos with
uneven side walls as well as in process tanks with various protruding
objects. Furthermore, as a result of the narrow beam angle - the emitted
ultrasonic signals have an outstanding focusing - deep penetration through
gases, vapour and foam is ensured.
X
1 m
2 m
5 m
10 m
15m
r r
D
Dead Band is a feature common to all ultrasonic level meters.
It is specified as "Minimum measuring distance" in the Technical Data
Table. Measurement within this range can not be interpreted.
.
M
D
0,21 m
0,3 m
The Diameters
0,56 m
corresponding to
1 m
5° beam angle.
1,45 m
1