Nozzle flow meters are mainly used for measurements in petroleum, chemical, metallurgical, electric power, light industry and other sectors to measure the flow of liquid, steam, and gas. So how to install the nozzle flowmeter? What are the installation requirements and precautions for nozzle flowmeters?Nozzle flowmeter installation method and matters needing attentionHow to install the nozzle flowmeter? When the pressure difference between the front and back of the pipeline is large, the method of increasing the standard nozzle should be used. The measuring principle of the nozzle flowmeter is: When the fluid flows in the pipeline, due to the local resistance of the standard nozzle, the pressure of the fluid is reduced, and the energy is lost. The phenomenon is called throttling in thermodynamics. The installation method of using this nozzle flowmeter is simpler than using a regulating valve, but a suitable nozzle flowmeter must be selected. Otherwise, the liquid is prone to cavitation, which will affect the safe operation of the pipeline.Ten major requirements for nozzle flowmeter installation:1. It is easy to realize the place where the sensor is separately grounded;2. The nozzle flowmeter is installed as far as possible to avoid direct sunlight;3. Try to satisfy that the front and rear straight pipe sections are not less than 5D and 2D respectively;4. Avoid high-concentration corrosive gases in the surrounding environment as much as possible.5. The nozzle flowmeter is installed as far as possible to avoid the negative pressure in the measuring tube;6. When measuring mixed-phase fluid, choose a place that will not cause phase separation;7. When measuring two-component liquids, avoid installing them in the downstream where the mixing is not yet uniform;8. The nozzle flowmeter is installed in a place with low vibration, especially for integrated meters;9. When measuring the chemical reaction pipeline, the nozzle flowmeter should be installed downstream of the reaction fully completed section;10. The installation of nozzle flowmeter should avoid large motors, large transformers, etc. nearby, so as not to cause interference to the nozzle field.1. How to install the nozzle flowmeterThe split installation of nozzle flowmeter is composed of independent nozzle device, differential pressure, pressure, temperature transmitter, flow calculator, stop valve and other parts. The pressure pipe connection between the nozzle flow sensor and the differential pressure transmitter is completed by the user.2. Nozzle flowmeter components and installation
The integral installation means that the differential pressure transmitter and the nozzle have been connected as a whole when the product leaves the factory. After the user purchases the integral nozzle, there is no need to connect the pressure pipe when using it. The integrated installation of the nozzle flowmeter is composed of an intelligent display instrument and a nozzle device. The integrated installation comes with high-quality differential pressure sensors, pressure sensors, and thermal resistance temperature sensors.
Post time: 21-09-21