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ZTD smart displacer level (interface) transmitter0 pages
ZTD Series Smart Displacer Level (Interface) Transmitter
Summary
ZTD series smart displacer level (interface) transmitter is
produced by Dandong Top Electric Instrument Co. Ltd,
cooperating with Fisher Controls Company. We import
the original DLC3000 series smart level controller, other
parts are designed and manufactured by ourselves. ZTD
is suitable for level, interface or density measurement
with standard output signal 4~20mA DC + HART. By
using HART Communicator which is compatible with
DLC3000 series smart level controllers, not only can you
check, configure, calibrate, or test the smart level
transmitter, but also you can receive the messages from a
single controlling loop and download the information
from site into control system.
Operation principle
ZTD series smart displacer level (interface) transmitter
consists of imported original DLC3000 series smart level
controller and measuring chamber, measuring mechanism,
displacer and torque tube, etc. The liquid level changing
triggers the change of the buoyancy of displacer, then it will
be transferred into the torque tube unit. This makes the torque
tube and core axle rotate synchronously.
At the same time, the magnetic steel parts that fixed at the
core axle of the torque tube turn rotary displacement. The
Hall-effect sensor senses the magnetic field change and
converts the magnetic signals into current signals. DLC3000
series smart level controller measures process variables with
a controller and relative electronic circuit, supplies current
output to drive LCD and support HART communication.
Controller receives the electric signals that have been
temperature-compensated and linearised. Meanwhile,
compensates the liquid density change caused by the change
of the process temperature, then supplies 4~20mA current
output signals. LCD can indicate analog output, process
variables, process temperature (if RTD is installed), degrees
of the torque tube rotation and percent range of variable, etc.
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