JC- LUGB vortex flowmeter to measure gas according to Carmen (Karman) vortex principle, volumetric flow meter steam or liquid volume flow, standard condition volume flow or mass flow. And as flow transmitters used in automation control system.
The instrument uses advanced differential technology, with isolation, shielding, filtering and other measures to overcome the shock of similar products and poor, small-signal data disorders and other problems, and uses a unique sensor packaging technology and protective measures to ensure product reliability The product has two basic and complex forms, basic measuring single flow signal; complex can be achieved simultaneously measure temperature, pressure, flow of each form has a whole sub-structure, in order to adapt to different installation environment.
Second, the principle
Vortex flowmeter is when the body fluid flows through the vortex, its sides formed two rows of alternating vortex body, detection probe and the corresponding electronic circuits and other components in the flow field by the design of the vortex., Which Species vortex is called Karman vortex Strouhal on the basis of Karman vortex theory proposed the velocity is proportional to the frequency of Karman vortex fluid, and gives the frequency and velocity relationship:
f = St * V / d where:
Vortex frequency of f (Hz)
The average flow rate in both sides (m / s) V vortex
St Strouhal coefficient (constant)
These alternating vortices to form a series of alternating negative pressure; the pressure acting on the detection probe; they produce a series of alternating electrical signal; after preamplifier conversion; shaping; after the enlargement process; output and synchronized into a vortex proportional pulse frequency signal (or standard signal).
Third, the instrument characteristics and uses
· No moving parts; long-term stability; simple structure, easy installation and maintenance;
* Use interference cancellation circuit and vibration sensor head, with a certain resistance to environmental vibration performance;
· Ultra-low-power single-chip microprocessor technology Section 1 3.2V10AH lithium battery can use more than 5 years;
· By software on the instrument coefficient nonlinear correction, improve the measurement accuracy;
Pressure loss, wide range;
Adopt EEPROM cumulative traffic brownout protection, protection longer than 10 years;
The instrument can be widely used in large, medium and small variety of pipes for drainage, industrial recycling, waste water treatment, oil and chemical reagents as well as compressed air, saturated and superheated steam metering, gas and a variety of media traffic.