⎝⎛星力捕鱼⎞⎠

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technical article
Accurate measurement and easy installation
2012-2-21 9:21:44

具有结构简单、工作可靠、适用范围广、测量准确、安装方便等特点,具有耐高温、耐高压、DEC-LZ系列金属转子流量计有普通型和防腐蚀型,以上两种类型均分为现场指示型(DEC-LZZ-)和电远传型(DEC0LZD-)、普通型流量传感器、仪表材料为(1Cr18Ni9Ti)、防腐型为(1Cr18Ni9Ti)内衬PTEF。 The metal rotor flowmeter has the characteristics of simple structure, reliable operation, wide application range, accurate measurement and convenient installation. It has high temperature resistance, high pressure resistance, and the DEC-LZ series metal rotor flowmeter has ordinary and anti-corrosion types. They are divided into on-site instruction type (DEC-LZZ-) and electric remote transmission type (DEC0LZD-), ordinary flow sensors, instrument materials (1Cr18Ni9Ti), and anti-corrosion type (1Cr18Ni9Ti) lined with PTEF. If the medium measured by the metal rotor flowmeter contains ferromagnetic particles, a magnetic filter should be installed at the inlet of the flowmeter. Its material should be the same as the corresponding flow meter.
Main technical parameters: (1) Basic measurement range: water (20 ℃) 2.5-150000L / h
Air (20 ° C, 0.1013MPa) 0.07-4000Nm3 / h
Range ratio: 10: 1
Accuracy: 1.5 / 2.5
Working pressure: ≤6.4MPa
Working temperature: -40 to 350 ° C (fluoroplastic lining -10 to 80 ° C)
Ambient temperature: -20 to 80 ° C
Medium viscosity: DN15≤5mPa.S
DN25 ~ DN150≤250mPa.S
Body material: 1Cr18Ni9Ti, 316L, lined with PTEF, etc. Process connection: flange, or according to user's request. Steam ferrule: flange, DN15 / PN1.6, or according to user (2) remote transmission device ① SK5W1-1 angular displacement Basic error of transmitter: 1.5% FS
Output signal: 4 ~ 20mA
Load impedance: 350Ω
Power supply voltage: 24VDC
Ambient temperature: -30 to 80 ° C
Outlet: M20 × 1.5
Explosion-proof mark: ExibIICT4
② Power effect of DECE-HD transmitter: <0.1% (not including digital resolution [70μA)
Load effect: <0.1% (excluding digital resolution [70μA)
Current loss: 4 to 21.6 mA, relative to 0% of the measured value
Load impedance: 0 to 800
Working voltage: 12.8 ~ 30VCD
Two-wire system Rext [KΩ] = (Power supply [V] -12.7) / 22mA
Output signal: 4 ~ 20mA
Ambient temperature: -25 to 80 ° C
Outlet: M20 × 1.5
Explosion-proof mark: ExibIICT6

In the inter-plant measurement of our factory's energy and power, the primary detection element is mainly the orifice plate. Due to the small amount of some users, there has always been a problem that small signals cannot be accurately measured. 已稳定运行数月,取得了良好的测量效果。 In order to solve this problem, we started to try to use the metal rotor flowmeter produced by Yuyao in Zhejiang as a primary detection element for small flowmeters, and applied it in special steel plant argon gas metering system, medium-sized plant oxygen metering system and machinery plant oxygen metering system. Among them, in the medium-sized plant oxygen metering system, the metal rotor flowmeter has been running stably for several months, and has achieved good measurement results. The following briefly describes the characteristics, selection and use of metal rotor flowmeters. I. Measurement principle and characteristics of metal rotor flowmeter
The measurement part of the metal rotor flowmeter consists of an orifice plate and a cone-shaped float. When the fluid flows upward through the tube, the cone-shaped float moves upwards and reaches a certain position equilibrium. At this time, the ring gap between the float and the orifice plate remains constant, and The area of the ring gap is proportional to the height of the float, and a certain height of the float represents the amount of flow. When the float moves up and down, it is transmitted to the external indicator in the form of magnetic coupling, so that the pointer of the indicator follows the displacement of the float. And with the help of the cam plate, the pointer linearly indicates the amount of flow. Features: The metal rotor flowmeter has a simple structure, reliable operation, wide application range and high range ratio, generally 10: 1. Second, the selection of metal rotor flowmeters; when measuring liquids, metal rotor flowmeters are generally marked with water in a standard state (20 ° C); when measuring gases, they are measured in a standard state (20 ° C, absolute pressure 0.1013MPa). Air scale. Therefore, when selecting an instrument for a certain measurement fluid, its flow range should be converted into the water or air flow under standard conditions, and then the selected range should be selected against the standard scale of the metal rotor flowmeter according to the converted flow range.


能得到广泛应用是与其特点密不可分的,首先,此种仪表在相同口径低流速的测量中有明显优势。 The widely used metal tube rotor flowmeter is inseparable from its characteristics. First of all, this instrument has obvious advantages in the same caliber low flow velocity measurement. For example, the DN15 caliber can achieve a minimum flow rate of 10 l / h and an accuracy of 1.0. Compared with the electromagnetic flowmeter of the same caliber, the domestic production line is generally 0.5m / s (318 l / h), and the imported electromagnetic field is generally 0.1. At m / s (63.6 l / h), the accuracy is about 1.5. When the flow rate is lower than 0.1m / s, there are no specific parameters to check, but it is obvious that the accuracy is not as good as that of the metal tube rotor. The metal tube rotor can also work under industrial control conditions such as high temperature and high pressure, which is also an advantage unmatched by other instruments.
Our company has mass-produced the rotor flowmeter. In terms of this instrument, we have the following advantages:
1. International market procurement of important core components. Such as rotary bearings imported from Germany. Problems rarely occur during use. If domestically produced ones are used, rotation inflexibility often occurs, especially during field use. Problems often occur, which affects measurement accuracy.
2. The machining parts are processed in batches using numerical control processing equipment. This processing mode has higher processing accuracy and efficiency than traditional ordinary machine tools, which saves costs and greatly improves the consistency of the instrument and ensures the linear scale of the instrument. To improve the accuracy of the meter.
3. The application of the traditional water tower type water flow calibration device makes the water flow rate and flow rate stable and the pressure constant during the calibration process. Professional measurement and verification personnel make the measurement accuracy of the meter more reliable.
Our rotor flowmeter pays more attention to the cost performance of the product, and achieves a lower price under the premise of ensuring the accuracy and reliability of the product.