Power plant demineralized water flow meter correct selection method

Project Overview

　　Currently on the market in the power plant demineralized water flowmeter manufacturers are very many, each manufacturer's on-site selection capabilities are also different, it is very important to choose an engineer with extensive experience to help select the type.

　　Without further ado, the main parameters to be confirmed for the selection of desalinated water flow meters for power plants are as follows:

• 1、Measuring medium: Power plant demineralized water flowmeter is a kind of velocity type flowmeter, which first converts the medium flow rate into the rotational speed of the turbine, and then converts the rotational speed into the electrical signal which is proportional to the flow rate. Its principle, determines the type of measurement medium, can only be gas, or water, pure water, organic liquids, inorganic liquids and other liquids without fibers, particles and impurities. Because fibers, particles and other impurities may entangle the turbine's blades, or cause losses to them, which then leads to the measurement accuracy is affected, or even stop rotating.
• 2、Pipe caliber: Unlike other flow meters, the caliber of desalinated water flow meter for power plant can be very small, theoretically it can be DN4, while other flow meters generally can only be DN15 or above. However, the upper limit of the caliber of power plant desalination flowmeter is also very small, theoretically it can only be DN200, which is also applicable to most of the market demand. Turbine used in some high-precision occasions, such as quantitative control, will be used in power plants in addition to a lot of salt water flowmeter.
• 3、Measurement Accuracy: There are several levels of accuracy for demineralized water flow meters in power plants, the conventional ones are 0.5 level and 1.0 level. These two levels can basically meet the needs of most industrial sites. However, in some of the higher precision requirements of the occasion, often need a higher level. Don't worry, other flow meters can rarely reach, but our demineralized water flowmeter can do 0.2 level of accuracy Oh, is not very powerful?
• 4、Medium viscosity: The principle of desalinated water flowmeter for power plant was mentioned earlier, the desalinated water flowmeter for power plant is to use the flow rate of the medium converted to the rotational speed of the turbine, and then convert the rotational speed into an electrical signal that is directly proportional to the flow rate. The principle determines that the power plant in addition to salt water flow meter is not suitable for measuring too viscous liquid, otherwise it will affect the rotation of the impeller (in this case is more suitable for elliptical gear flowmeter). Theoretically, the power plant in addition to the saline water flow meter medium viscosity to be less than 5 × 10-6m2 / s (greater than 5 × 10-6m2 / s of the liquid, the flow meter to be used after the calibration of the real liquid), in layman's terms, to be viscous than the cooking oil is small.
• 5、Nominal Pressure: According to the current market demand, the main 1.0Mpa; 1.6Mpa; 2.5Mpa; 4.0Mpa; 6.3Mpa (other pressure levels can be customized, according to the agreement supply).
• 6、Medium temperature: According to the current market demand, the main temperature range is -20 ℃ ~ +120 ℃ (stainless steel measuring tube), if you need a larger range, you can ask the manufacturer, can be customized.
• 7、Power supply: According to the current market demand, there are mainly 3.6V lithium battery; 12VDC; 24VDC three kinds of power supply options, you can select the appropriate power supply according to the site conditions.
• 8、Output Signal: According to the current market demand, there are mainly three-wire pulse output, two-wire 4-20mA output. In addition, some occasions may need digital output, we can also provide modbus RS485 communication and RS232 communication.