One. Overview LUGB type vortex flowmeter is to measure the volumetric flow rate of gases, vapors or liquids according to Carmen (Karman) vortex principle, volume flow meter standard conditions of volumetric flow or mass flow, and as flow transmitters for automation control system. The instrument uses advanced differential technology, with isolation, shielding, filtering and other measures to overcome the shock of similar products is poor, small-signal data disorders and other problems, and uses a unique sensor packaging technology and protective measures to ensure product reliability . Products are basic and complex two types, basic single flow measurement signal; composite enabling simultaneous measurement of temperature, pressure and flow. Each type has a whole sub-structure to accommodate different installation environments. II. Body detection probe and the corresponding electronic circuits and other components works vortex flowmeter is generated by the vortex. When the body fluid flows through the vortex, its sides formed two rows of alternating vortex, this vortex is called Karman vortex street. Karman vortex velocity is proportional to the frequency of the fluid. f = St × V / d where: f vortex occurs Frequency (Hz) in both sides of the average velocity (m / s) V vortex St Strouhal coefficient (constant) These alternating vortices formed a series of alternating negative pressure which acts on the sensing probe, will produce a series of alternating electric signal, after converting a preamplifier, shaping, after enlarging processing, and outputs a pulse proportional to the vortex frequency synchronizing signal (or standard signal). Three. Instrument characteristics and uses features: no moving parts, long-term stability, simple structure, easy to install and maintain the use of interference cancellation circuit and vibration sensor head, with a certain resistance to environmental vibration performance using ultra-low power single-chip microprocessor technology, a 3.6 V10AH lithium batteries can be used for more than five years by the software on the instrument coefficient nonlinear correction to improve the measurement accuracy of the pressure loss, wide measuring range of the cumulative traffic using EEPROM power-down protection, the protection of longer than 10 years of use: This instrument can be widely used in large, medium and small variety of drainage pipes, measuring industrial recycling, waste water treatment, oil and chemical reagents as well as compressed air, saturated and superheated steam, gas and a variety of media traffic. Four. Technical parameters Nominal Diameter (mm) 20,25,40,50,65,80,100,125,150,200,250,300 meter Material 1Cr18Ni 9Ti Nominal (MPa) PN1.6MPa; PN2.5MPa; PN4. 0MPa measured medium temperature (℃) -40 ~ + 250 ℃; -40 ~ + 350 ℃ Environmental Conditions Temperature -10 ~ + 55 ℃, relative humidity of 5% to 90%, atmospheric pressure 86 ~ 106kPa accuracy level measurement of liquids: show value ± 0.5 measuring gas or steam: showing the value of ± 1.0, ± 1.5 range than 1:10; 1:15 pressure loss coefficient Cd <2.6 output signal of the sensor: 0.1 ~ 3000Hz pulse frequency signal HIGH LOW ≤1V ≥6V transmitter: two-wire 4 ~ 20mADC current signal sensor power supply: + 12VDC, + 24VDC (optional) Transmitter: + 24VDC site display type: 3.6V lithium battery that comes with the instrument signal transmission lines STVPV3 × 0.3 ( three-wire), 2 × 0.3 (two-wire) transmission distance ≤500m signal line within the interface thread M20 × 1.5 Explosion levels ExdIIBT6 protection IP65 allows vibration acceleration 1.0g