How to choose a large diameter hot water flow meter

Project Overview

　　Currently on the market large diameter hot 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 large-diameter hot water flow meters are as follows:

• 　　1. Measuring medium: Large diameter hot water flowmeter is a kind of velocity type flowmeter, which first converts the flow rate of the medium into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal that is proportional to the flow rate. Its principle, determines the type of measurement medium, can only be gas, or water, pure water, organic liquid, inorganic liquid and other liquids without fiber, particle impurities. Because fibers, particles and other impurities may entangle the turbine's blades, or cause losses to them, which in turn leads to the measurement accuracy is affected, or even stop rotating.
• 　　2. Pipe caliber: Unlike other flow meters, the caliber of large-diameter hot water flow meter can be very small, theoretically can be done DN4, while other flow meters generally can only be done above DN15. But the upper limit of the caliber of the large diameter hot water flowmeter is also very small, theoretically can only do DN200, can also apply to most of the market demand. Turbine is mostly used in some high-precision occasions, such as quantitative control, will use a lot of large diameter hot water flowmeter.
• 　　3. Measurement accuracy: The accuracy of large diameter hot water flowmeter also has several grades, the conventional 0.5 grade, 1.0 grade. These two levels can basically meet the needs of most industrial sites. However, in some occasions with higher accuracy requirements, a higher grade is often needed. Don't worry, other flow meters can rarely reach, but our large-diameter hot water flowmeter accuracy can be achieved 0.3 level Oh, is not very impressive?
• 　　4. Medium viscosity: Previously mentioned the principle of large diameter hot water flowmeter, large diameter hot water flowmeter is the use of media flow rate is converted to the rotational speed of the turbine, and then the rotational speed is converted into an electrical signal proportional to the flow rate. The principle determines that the large diameter hot water flowmeter is not suitable for measuring too viscous liquid, otherwise it will affect the rotation of the impeller (in this case it is more suitable for elliptical gear flowmeter). Theoretically, large diameter hot water flowmeter medium viscosity to be less than 5 × 10-6m2 / s (greater than 5 × 10-6m2 / s of the liquid, the flowmeter should be used after the calibration of the real liquid), in layman's terms, to be viscosity than cooking oil is small.
• 　　5. Nominal pressure: According to the current market demand, there are mainly 1.0Mpa; 1.6Mpa; 2.5Mpa; 4.0Mpa; 6.3Mpa (other pressure levels can be customized and supplied according to agreement).
• 　　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.