Technical innovation of metal tube float flowmeter
为变面积式流量计，即在流量计的垂直测量管中，当流体向上流经测量管时，浮子向上移动，在某一位置浮子所受升力与浮子重力达到平衡，此时浮子与孔板(或锥管)间的流通环隙面积保持一定。 XX-LZ series metal tube float flowmeter is a variable area flowmeter, that is, in the vertical measurement tube of the flowmeter, when the fluid flows upward through the measurement tube, the float moves upward, and the lift force and the gravity of the float are received at a certain position. Equilibrium is reached. At this time, the area of the circulating annulus between the float and the orifice plate (or cone tube) remains constant. The ring gap area is proportional to the rising height of the float, that is, a certain height of the float represents the magnitude of the flow. When the float moves up and down, the position is transferred to the external indicator by the formation of magnetic coupling, so that the pointer of the indicator moves with the float, and the pointer linearly indicates the magnitude of the flow value by means of the cam plate. The electric remote transmission type metal tube float flowmeter can not only read the flow value from the pointer on the spot, but also can convert the flow value into 4-20mA and send it out through the pointer's angular displacement sensor and transmission circuit.
Technical requirements for metal tube float flowmeter
1. Measuring range: water (2.5 ～ 6000) L / h; air (0.07 ～ 2000) m3 / h (at 0.101025 MPa, 20 ℃).
2. Accuracy level: 1.5, 2.5.
3. Range ratio: 10: 1.
4. Working pressure: DN15 ~ 50, 4 MPa; DN80 ~ 100, 1.6MPa.
5. Medium temperature: －80 ℃ ～ 200 ℃ (lined with F46 flowmeter 0 ℃ ～ 85 ℃).
6. Viscosity of liquid medium: DN15 <5mPa? S; DN25 ～ 100 <5mPa? S.
7. Connection method: flange connection, thread connection, etc .; flange adopts GB / T9119.8 ～ 10 standard.
8. Total length: DN15 ～ 100 250mm.
9. Material of measuring tube: ordinary type 1Cr18Ni9Ti, corrosion-resistant type Cr18Ni12Mo2Ti, 316L, 316 lined F46, etc.
If the user has special requirements, special orders can be made.
10. Output signal: two-wire system (4-20) mA, three-wire system (0-10) mA.
11. Linearity: 1%;
12. Power supply: DC 24 (1 ±) V.
13. Power consumption: 25 mW.
14. Ambient temperature: -25 ℃ ~ 55 ℃.
15. Temperature effect: 0.5% / 10 ℃.
16. Load resistance: DC (0 ～ 10) mA (0 ～ 1) kΩ;
(4 to 20) mA (0 to 600) Ω.
17. Wiring cable: RVVP 3 × 28 / 0.15.
18. Explosion-proof grade: ExibⅡ2CT5 (certificate number GYB03582U).
19. With safety barrier model: LB906 type.
20. Electric remote transmitter: K5WI-I or ESK-I (two-wire system). ;
浮子在测量管中，随着流量的变化，将浮子向上移动，在某一位置浮子所受的浮力与浮子重力达到平衡。 The metal tube float flowmeter floats in the measuring tube. With the change of the flow rate, the float is moved upward, and the buoyancy received by the float at a certain position reaches a balance with the gravity of the float. At this time, the area of the circulation annulus between the float and the orifice plate (or cone tube) is kept constant. The area of the ring gap is proportional to the rising height of the float, that is, the position of the float rising in the measuring tube represents the magnitude of the flow. The position of the float is transmitted by the internal magnet to the external indicator, so that the indicator correctly indicates the value of the flow . This makes the indicator housing not in direct contact with the measuring tube, so even if a limit switch or transmitter is installed, the instrument can be used under high temperature and high pressure working conditions.
Metal tube float flowmeter is a variable area flow measurement instrument commonly used in industrial automation process control. It has the characteristics of small size, large detection range and convenient use. It can be used to measure the flow of liquid, gas and steam, especially suitable for medium flow measurement with low flow rate and small flow.
1.Dual indication system
The metal tube float flow meter uses the principle of magnetic coupling to indicate the instantaneous flow rate through mechanical transmission, and at the same time drive the sensor magnetic steel to convert the magnetic signal corresponding to the flow signal into a digital signal electronically and display the instantaneous and accumulated flow rate through the liquid crystal. This kind of advantage is: once the electronic part is abnormal, the independent mechanical indication system can still reflect the size of the on-site flow, which improves the reliability of the instrument.
2. Magnetic coupling and magnetic signal separation
The metal tube float flowmeter uses an independent magnetic coupling system. The signal of its transmitting part comes from the special sensing magnetic steel. This has the advantage that it is not affected by medium temperature and ferromagnetic particles during measurement. Also not affected by the size of the caliber. The sensing magnetic steel maintains a fixed distance from the magnetoresistive sensor, so each instrument of different calibers has a sufficiently strong magnetic signal, which brings high resolution and high accuracy.
3.LCD digital display
XD series float flowmeter adopts double-line large LCD digital screen, which simultaneously displays instantaneous flow rate and cumulative flow rate. The instantaneous flow rate display range is 0 ~ 50,000, the cumulative value display range is 0 ~ 99999999, and the decimal point is optional. In addition, the LCD screen uses a wide temperature liquid crystal. During the operation of the instrument, the LCD screen can be inserted and removed at any time, which will not affect the normal operation of the instrument. When the LCD screen is inserted and removed while the power is on, the LCD will automatically refresh. Remove the LCD screen, the meter can also work normally. In addition, the metal tube float flow meter can also provide battery-powered products. The color bar of the battery power display is as clear and clear as the battery power indicator.
4.Full range of flow measurement
The metal tube float flowmeter includes all pipe diameters that can be reached from the conventional series: DN15 ~ DN100 to special calibers: DN8, DN10, DN150, DN200 and so on. Very advantageous in small flow measurement.
5.High temperature and pressure resistance
The metal tube float flowmeter coupling magnetic steel and the float magnetic steel are all made of AlNiCo high quality magnetic steel. The demagnetization temperature is above 500 degrees, so the high temperature medium below 450 degrees can be measured.
Due to the magnetic coupling principle, the metal tube float flowmeter is a non-leak flowmeter, and pressure has no effect on the flowmeter. Therefore, the SF10 flowmeter can withstand medium pressures above 16MPa.
6.Protection and explosion-proof performance
The metal tube float flow meter uses a cast aluminum casing with an IP65 protection level, which can be used in outdoor and outdoor applications. In addition, the SF10 metal tube float flow meter has two types of explosion protection: intrinsically safe and flameproof. Both have obtained national explosion-proof certification.
7. Full range of installation methods
Series metal tube float flowmeters provide users with comprehensive installation methods: optional vertical, horizontal, side-in, side-out, left-in, right-out, right-in, left-out, lower-in, upper-out, etc.
8.Power supply method
XD series metal tube float flow meter can provide 24V DC two or three wire power supply, 220VAC power supply, battery power supply and other methods, and it can also have backlight. The battery products use high-energy lithium batteries, and one battery can be used by the meter for more than three years.
的电路部分采用美国德仪TI公司最新推出的16位MCU，内部包括16位A/D，内部参考源，Flash内存，16K ROM，256字节RAM，外部采用14位D/A，高集成化全贴片，因此给此产品带来高可靠性。 The circuit part of XD series metal tube float flowmeter adopts the latest 16-bit MCU from Texas Instruments, including 16-bit A / D, internal reference source, Flash memory, 16K ROM, 256-byte RAM, and 14-bit external D / A, highly integrated full-chip, therefore brings high reliability to this product.