3 Types of Level Gauges
Posted in Uncategorised, on May 11, 2021 By Admin
A level gauge is a tool that is used for measuring the level of fluids or gases inside a tank or storage container such as drums, pressure vessels, and more. They are widely used in industrial processes wherein performing a direct physical measure of fluid levels is impossible, impractical, or dangerous, such as if the fluid is hazardous or the tank containing the fluid has to remain sealed.
Typically, level gauges are made up of a metal body with a front window made of high resistant glass showing the fluid level. The workings of a level gauge follow three primary principles: the pressure head, material weight, and height of the liquid or fluid surface.
Level gauges come in a number of different types. Today’s blog will discuss the differences among these:
Armoured level gauge: Armored level gages are used in a variety of applications, such as in petrochemical refineries and chemical plants. They work well in high-pressure environments, coming in a variety of PSI ratings up to 4000 PSI. They are available with transparent and reflex gauge glasses.
- Reflex gauge glass: This type of gauge glass follows light refraction principles. A reflex level gauge has a glass piece that is flat on the outside but has prismatic grooves on the inside that face the vapour and liquid space. Its readings are based on whether light enters the vapour or liquid space, thus providing an accurate measurement of fluid levels. As such, a reflex level gauge can be installed in a tilted or vertical position with no deviation in reliability.
- Transparent gauge glass: This type of gauge uses two transparent glass plates on opposite sides of the chamber. This allows operators to observe the liquid characteristics and level, as well as the interface between two different liquids. The level of fluid is measured in terms of the difference in the transparency of the liquid compared to the vapour present in the chamber of the gauge.
Tubular level gauge: Tubular gauges come with a clear or red line Borosilicate (Pyrex) to help improve visibility and measurement of clear fluids. They are often used in low-pressure applications up to 600 psi. Normally, they are recommended for use with oils and petrochemical liquids as opposed to water or steam as there is a possibility of the gauge’s steel valves developing rust or corrosion. However, the tubular gauges sold at McRae Engineering have automatic valves made with corrosion-resistant ball checks and stainless steel valves.
Magnetic type level gauge: For this type of level gauge, the chamber is constructed of non‐magnetic materials, with its float engineered and located inside the chamber. It is sized and weighed to the specific gravity of the process fluid to be measured. The float contains a 360° magnetic assembly, generating a strong uniform magnetic circuit. The float will move according to the changes in the liquid level, allowing for precise measurements.
As you can see, different types of level gauges work differently to suit different applications. In order to ensure you select the right product, speak to the experts at McRae Engineering. Call us today!
