1. Precision functional inspection

The accuracy level and function of the instrument are selected based on measurement requirements and usage scenarios to achieve economic benefits. For example, when used for trade settlement, product handover, and energy measurement, higher accuracy levels such as 1.0, 0.5, or higher should be chosen; For process control applications, select different accuracy levels according to control requirements; In some cases where only the process flow is detected without the need for control and measurement, slightly lower accuracy levels such as 1.5, 2.5, or even 4.0 can be selected. In this case, low-cost plug-in vortex flow meters can be used.

2. Measurable medium

When measuring medium flow velocity, instrument range, and diameter, the full flow rate of the vortex flowmeter can be selected within the range of 0.5-12m/s for measuring medium flow velocity, which is relatively wide. The selection of instrument specifications (caliber) may not necessarily be the same as the process pipeline. It should be determined based on whether the measured flow rate range is within the flow rate range. That is, when the pipeline flow rate is too low to meet the requirements of the flow instrument or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the instrument diameter to increase the flow rate inside the pipeline and obtain satisfactory measurement results.

3. Selection of Vortex Flow Transmitters

In saturated steam measurement, a VA type piezoelectric vortex flow transmitter is used. Due to the wide range of the vortex flow meter, in practical applications, the main consideration is generally to measure the flow rate of saturated steam not less than the lower limit of the vortex flow meter, which means that the fluid flow rate must not be lower than 5m/s. Choose different calibers of vortex flow transmitters based on the size of steam consumption, rather than selecting the transmitter caliber based on the existing process pipeline caliber.

4. Selection of pressure compensation pressure transmitter

Due to the long length of the saturated steam pipeline and significant pressure fluctuations, pressure compensation must be used. Considering the correspondence between pressure, temperature, and density, only pressure compensation can be used in the measurement. As the saturated steam pressure of Mingtong Company's pipeline ranges from 0.3 to 0.7 MPa, the range of the pressure transmitter should be 1 MPa.

5. Display instrument selection

The intelligent flow display instrument has functions such as voltage stabilization compensation, instantaneous flow display, and cumulative flow calculation.