In a variety of devices, it's vital to measure the fluid level for many reasons. The best device to perform this operation is a level gauge. Of course, it comes in different types, depending on the application and the nature of the fluid being measured. In essence, it comprises a metal body along with an internal chamber. The exterior is covered with safety glass so that the fluid level can be directly observed. Now that the basics are covered, it’s time to learn about the classification of level gauges.
Here are the 2 basic types of level gauges.
Reflex Level Gauge
This type of level gauge is used to easily distinguish the level of liquid, gases or vapours. The basic working principle behind this device is based on reflection and refraction. Essentially, the glass panel is fitted facing the chamber and it has prismatic grooves on it. The liquid is deposited in the lower half of the gauge and the gases are deposited in the upper part. Thus, the fluid levels are known thanks to the brightness reflected by the glass in the two respective zones.
Reflex level gauges can be used in most liquid systems, with the exception of high-pressure steam. For fluids that have high operating pressure, a different kind of gauge is used.
Transparent Level Gauge
As the name suggests, a transparent level gauge can be seen all the way through. Comprising two glass plates, the fluid is held in between these plates. Due to the different levels of transparency of the two glass plates, the level of the fluid can be accurately measured. Moreover, in order to protect the gauge from corrosive fluids, transparent level gauges are offered an extra layer of protection using mica shields.
Due to added protection, these gauges are perfect for corrosive fluids, high-pressure fluids like steam, and in cases where the system receives thermal shocks.
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