测量准确度的重要因素． Uneven velocity distribution and the existence of secondary flow in the tube are important factors affecting the accuracy of liquid turbine flowmeters . Therefore, liquid turbine flowmeters have certain requirements for upstream and downstream straight pipe sections. For industrial measurements, straight pipe lengths of 20D upstream and 5D downstream are generally required. In order to eliminate the secondary flow, it is better to install a rectifier at the upstream end. If the upstream end can guarantee a straight pipe section of about 20D, and a rectifier is installed, the measurement accuracy of the flow meter can reach the accuracy level of calibration.
对流体的清洁度有较高要求，在流量计前须安装过滤器来保证流体的清洁． Liquid turbine flowmeters have higher requirements for fluid cleanliness. Filters must be installed in front of the flowmeter to ensure the cleanliness of the fluid. The filter can be a funnel type, and its cleanliness can be obtained by measuring the difference in pressure between the two ends. In order to ensure that the liquid passing through the flowmeter is single-phase, that is, air or vapor cannot be allowed to enter the flowmeter, an aerator should be installed upstream of the flowmeter if necessary. For liquids that are easily gasified, a certain back pressure must be guaranteed downstream of the turbine flowmeter. The size of the back pressure can be double the pressure drop of the flow sensor at the maximum flow rate and 1.2 times the vapor pressure of the liquid at the maximum temperature. The turbine flow meter is a precision flow measurement instrument that is matched with the corresponding flow accumulation instrument. Can be used to measure liquid flow and total volume. It is widely used in the measurement and control systems of petroleum, chemical industry, metallurgy, scientific research and other fields. Turbine flow sensors equipped with sanitary joints can be used in the pharmaceutical and food industries. Intelligent integrated turbine flowmeter structure is explosion-proof design, which can display the total flow, instantaneous flow and percentage of full flow. The battery uses a long-lasting lithium battery. The service life of the single-function accumulator battery can reach more than 5 years, and the service life of the multi-function indicator battery can reach more than 12 months. The intelligent integrated meter can display a large number of flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. You can set fixed pressure and temperature parameters to compensate for gas, and small changes in pressure and temperature In this case, the flowmeter can be used for fixed compensation accumulation.
传感器部分的维护保养要注意以下几点： The maintenance of the liquid turbine flowmeter sensor part should pay attention to the following points:
1. During use, the measured medium should be kept clean and free of impurities such as fibers and particles.
2. When the liquid turbine flow sensor is used, the sensor should be filled with medium slowly before opening the outlet valve (the valve should be installed at the back of the flow meter). It is strictly prohibited that the sensor is impacted by high-speed fluid when it is in a medium-free state.
3. The maintenance period of the liquid turbine flow sensor is generally half a year. When cleaning, please be careful not to damage the parts in the measuring cavity, especially the impeller. Please pay attention to the positional relationship between the guide and the impeller during assembly.
4. When the liquid turbine flow sensor is not in use, the internal medium should be cleaned. After drying, add protective sleeves at both ends of the sensor to prevent dust from entering, and then store it in a dry place.
5. The matched filter should be cleaned regularly, and the internal media should be cleaned when not in use. Like the sensor, add a dust cover and store it in a dry place.
6. Before the sensor is installed, blow the mouthpiece or dial the impeller to make it rotate quickly to observe whether there is display, and then install the sensor when there is a display. If there is no display, you should check the relevant parts and troubleshoot