Take a look at which flow meter should be used for these process conditions

Thread Content

The temperature is around 60°C, and the material is an aqueous solution of surfactant. Bubbles may form after passing through the centrifugal pump; consider point 1. The pH is around 2 at 25°C; as the temperature rises to the process temperature, corrosivity increases – point 2 should be taken into consideration. Previously, electromagnetic flowmeters were used, and it was common for the flow rate to read 0, triggering empty pipe alarms. Both horizontal and vertical pipes have been tried, as well as pre-exhaust measurement. None of them can solve the problem. Later, a gear flow meter was chosen, but the gears and housing had poor corrosion resistance; even the stainless steel used was cast-type stainless steel, which also has poor corrosion resistance. Now consider two types of flowmeters: 1. Metal tube float flowmeter – its drawback is imprecise measurement, typically with an accuracy class of 2.5. Moreover, the 4-20ma output cannot be accepted by our PLC (S7-200), or an additional module would be required at extra cost. 2. Turbine flowmeter: As for its components, the impeller inside is made of 2Cr13 material; it has been found that this type of impeller is not resistant to corrosion. It will inevitably affect accuracy after some time. Please give some advice to the staff