ZUT Intelligent Displacer Liquid Level Transmitter0 pages

ZUT Intelligent Displacer Liquid Level Transmitter

Summary
ZUT intelligent displacer level transmitter adopts stress measuring method
by applying the lever principle to acquire the signals being consistent with
fluid level change and being measured through high precision spectacles
cantilever stress sensor. Via being processed by A/D converter, MPU and
D/A converter, the measured signals are transferred into 4-20mA analog
signals and digital signals that are conformity with HART PROTOCOL and
are superimposed on the analog signals, and then the processed signals are
output. The transmitter has the functions of highly accuracy for linearity
treatment, strong interfere-resistance, remote configuration, checking,
maintenance and adjustment. It can work together with the other equipment
being in conformity with HART protocol in the field bus so as to realize the
digital two-way communication, process checking and automatic
controlling. It is compatible with the analog meter and features itself pretty external appearance with its
fashionable housing structure design. This structure makes each chamber separately to make the meter more
reliable and safe. Also the meter is added a precise static pressure adjustment device so as to keep high precision
and reliability. Both housing structure design and the static pressure adjustment device have been granted the
national patents.
The patent number for external appearance design: 99 3 21507.6;
The patent number for static pressure adjustment device: 99 2 23728.9;

Principle of Operation
A displacer is hung on the end of the lever. A buoyancy force F1 that changes consistently with the level change
applies on the displacer. Then F1 is transmitted and applies on lever 1 (see the schematic diagram). Lever 1 with
the shaft gland diaphragm (which functions both as the levers’ supporting point and as a gland seal) as a
supporting point transmits the F1 to lever 2 then produce F2. Another end of the lever 2 is connected with a
weighing sensor that converts F2 into electric signal. Via being processed by A/D converter, MPU, D/A converter,
the signal is transmitted out.
.(See figure 1, figure 2)
H angi rod
ng

F2

Lever 2

Lever 1

Sensor

M em brane
supportpoi
nt

D i acer
spl

Si na ltrea t ent
g
m
a nd co nversi
on
ci t
rcui

Rf

+ 24V D C
4

20m A

Bu oyan cy F1

Figure 1
Add: No..10 Huanghai Street, Zhenxing District, Dandong City, Liaoning Province, P.R. China
P.C.: 118000
E-mail: davidsong@ddtop.com
Tel: +86-415-6227343
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