After a long period of analysis and comparison, a research group of Nanjing Hohai University selected the FLOWLINE MicroMeTM ultrasonic level transmitter for the Yellow River water level measurement. The most important reasons why the MiniMeTM ultrasonic level gauge was selected are as follows:
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1. High cost performance: The ultrasonic level gauge has an accuracy of +/- 0.2%, a resolution of 3mm, a blind zone of only 10cm-30cm, and high reliability. The price is the lowest of all similar imported products.
2. The most characteristic and other similar products can not be compared with it: its beam width is only 5cm-7.6cm. The beam of a general ultrasonic level gauge is a cone of 8°-15°. The final ray width of the 10 m measurement range is 1.4 m to 2.68 m, while the MiniMe ray width is only 7.6 cm or 0.076 m. It has an incomparable advantage in the measurement of the liquid level of the narrowest storage tank or in the measurement of the river level.
Because in the river, the measurement of the lake liquid level generally requires the construction of a measuring well, the beam width is small, which can greatly reduce the capital cost of the measuring well.
3. The probe material of its outer casing material is high corrosion resistance of PC/ABSFR and PVDF Kynar, and the seal 50_1 of the outer casing reaches IP67. Adaptability to the environment is particularly strong.
4. Built-in non-volatile memory, can reliably save the user's debugging data, and has high reliability.
No more details are described below. In short, it is not surprising that the MiniMETM two-wire ultrasonic level gauge was selected as the measuring instrument for the Yellow River liquid level. With the wide application of river and lake liquid level measuring instruments, we believe that this kind of ultrasonic liquid level meter will play an increasingly important role in flood control and flood control work in China!
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.