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Target flowmeter selection considerations

Target flowmeter selection considerations target flowmeter structure
A simplified Schematic TCF structure is shown in Figure 16.2.
It consists of several parts of the measuring device force converter and signal processing display. The measuring device comprises a target plate and a measuring tube, the force converter is a strain gauge type sensor, and the signal processing display can directly display or output a standard signal in situ.
The structure diagram of the force sensor is shown in Figure 16.3. The force sensor consists of a barrel elastomer and a force strain gauge. It can be divided into two types: internal and external. When the elastomer is working
Deformation occurs underneath, which destroys the balance of the bridge composed of force strain gauges, producing an electrical signal that is squared with the flow. The signal transmission system is shown in Figure 16.4.

main feature
1) The sensing member is a non-movable component, and the structure is firm and simple;
2) Wide range of application and adaptability, fluid medium in general industrial process, including liquid, gas and steam, caliber range (D/V15 or above), working condition (pressure, temperature) can be applied, it can be said that it is the most A wide range of orifice flowmeters have the same range of use;
3) High precision, the total measurement is up to 0.2% R;
4) wide range, 4:1~15:l;
Target external type
6.2 strain gauge target flow sensor structure tube diagram
L-end the board;}_密封腔i卜{No;4_{arm;
S-sensor; 6-target; 7-nut; Yueyi shell; 9_~shield; io_ called e-plate; Il-strain gauge; 12-junction box
5) It can solve difficult flow measurement problems, such as measuring dirty fluids containing impurities (fine particles): crude oil, sewage, high temperature residual oil, caustic soda, asphalt, etc.;
6) It can be used for small caliber (DN15-DN50), low Reynolds number (Reo=icf-5x icf) fluid, which makes up for the difficult application of standard throttling device;
7) It can adapt to high-parameter fluid measurement, the pressure is up to tens of MPa, and the temperature can reach 4500C;
8) The flow rate of the bidirectional flowing fluid can be measured;
9) The pressure loss is low, about half of the standard orifice plate;
10) The anti-upstream obstruction has strong interference ability, and the length of the upstream straight pipe section is generally 5-10D;
11) Dry (hanging method) calibration can be used to bring convenience to user cycle check;
12) Direct-reading instruments do not require external energy, are clear and easy to operate, and can output standard signals (pulse frequency or electricity)
13) The price of the instrument is moderate, and the performance price ratio is high;
14) The high flow velocity impacts the target plate, and then the vortex street is generated, and the output signal will oscillate, which affects the stability of the signal, so
High flow rate measurement objects should be used with caution.

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