Choosing the right sensor for every job

摘要

From hydrostatic to opto-electronic to modern capacitive sensors, level sensor technology covers a wide range of options. But not all sensor systems are suitable for every job or application. And as the experts at Sensortechnics explain here, it's not just a question of technology. Determining which method of level measurement is best suited to a given application depends on the medium being measured, the type of measurements required (continuous or limit value), needs for data transfer and interfaces and finally also on the budget. The characteristics of the individual applications can vary widely too: aggressive, powdery or sterile media, foam or differing densities of fluids, giving rise to additional requirements, for example. Let's look at the key level measurement technologies in detail. Essentially, a hydrostatic sensor is installed as a dip probe directly above the base of the container or body of water and measures the pressure of the liquid column load, thereby determining the fluid level. Depending on the product, the measurement data is transmitted as analogue or digital signals in a continuous measurement.