1. General
ZE Series Mass Flowmeter (hereafter called ZE) is designed according to the Coriolis Principle. It can be widely
used for the process detecting and custody transfer/fiscal unit in many industries such as petroleum, petrochemical industry, pharmacy, paper making, food and energy etc.. As a fairly advanced kind of flow measuring
instrument, it has been paid attention to by the circle of measurement and accepted by many customers at home and
abroad.
2. Principle
ZE is designed according to the principle of Coriolis force. Under the alternating current effect, the magnet and coil
installed on the measuring tube will make two parallel measuring tubes vibrate according to some fixed
frequency. Once there is flow passing through the pipes, Coriolis force will give rise to deflection (phase shift) on
the vibration of two pipes and the deflection of vibration is directly proportional to the mass flow of fluid. Pick up
them and the mass flowrate could be calculated. The vibration frequency of measuring tube is determined by the total mass of measuring tube and inner fluid. When
the fluid density changes, the vibration frequency of measuring tube will be also changed, as a result, the fluid
density can be calculated. The temperature transducer installed in the pipeline can pick up the fluid temperature on time under the coordination
of measuring circuit.
3. Feature
3. 1 Digital transmitter Feature
Comparing with traditional analog circuit and analog transmitter, digital circuit and digital transmitter has the
following obvious merits:
3.1.1 The DSP chip is the core of digital transmitter for ZE. As we know, the techniques of Digital Signal
Processing can greatly increase the accuracy of flowmeter and broaden turndown ratio. 3.1.2 The sampling rate of digital transmitter is much higher than traditional products, so it provides shorter
response time for the flow, quicker reaction to the flow change, higher efficiency and better accuracy for small
amount tank loading/unloadingsystem. 3.1.3 Digital Signal Processing techniques can filter and shape the flow signal better. Well-designed digital filter
can remove industrial frequency electromagnetic fields, spatial electromagnetic fields and noise effect on mass
flowmeter, markedly enhance stability and reliability of mass flowmeter.
3.2. Mass Flowmeter Feature
Comparing with the traditional flow measurement method, ZE has following obvious merits:
3.2.1 Enable to directly measure mass flow rate of fluid in the pipeline without changing
any parameters, which avoids some measurement error of intermediate links. Its mass flow
rate can be high accuracy and good repeatability within bigger range of turndown ratio. 3.2.2 Fluid measured can be more extensive, such as the steady uniform flow of
common viscosity fluid, the high viscosity fluid, non-Newtonian fluid, slurry
containing some solid components and the liquid containing some trace of gas. 3.2.3 Besides mass flow measurement, the density and temperature and water cut (ratio) can
also be picked up and output by RS485-Mod bus / HART.
