Why glycerin is used in pressure gauge?


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Why glycerin is used in pressure gauge?

Glycerin is the most commonly used liquid in liquid-filled gauges. Glycerin-filled gauges are a good value and provide good vibration dampening for applications at room temperature. These gauges work well in temperatures between -4 ° F and + 140 ° F (-20 ° C and + 60 ° C)
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Other liquids used in pressure gauges

Silicone and other comparable oils have lower viscosities even at very low temperatures; therefore, silicone-filled gauges are better for applications with extreme temperature variations, especially in colder climates and when icing may be expected. Their working temperature range extends from -40°F to +140°F (-40°C to +60°C).

Halocarbon-filled gauges are better suited to applications that involve oxidizing agents such as chlorine, oxygen and hydrogen peroxide. They work within the same temperature range as glycerin-filled gauges, that is from -4°F to +140°F (-20°C and +60°C)…

Why liquid is used in pressure gauges?

Liquid-filled pressure gauges provide a number of advantages:

  1. The liquid absorbs the vibration and pressure peaks
  2. The liquid cushioning action allows the operator to take readings during dynamic load and rapid vibration conditions
  3. The liquid lubricates all moving elements, which drastically reduces wear and tear on movement
  4. Because most liquid-filled meters are filled with non-aqueous liquid and hermetically sealed, they operate in corrosive environments and are immune to moisture penetration and icing, and shock effects are reduced.
    Liquid-filled gauges enhance the reliability and integrity of the measuring system for long periods under extreme operating conditions.

How to choose right liquid for pressure gauges?

The type of liquid used to fill the meter varies with the application. Although pure glycerin provides the best performance in most applications, each one has its own requirements. Guidelines to help ensure that A fluid corresponds appropriately with an application are:

  1. If icing is a problem, use indicators filled with silicone oil or other comparable liquids. They have low viscosity even at -60 degrees C.
  2. If the system has electrical accessories such as contacts, use insulating oils, and
  3. If extreme temperature fluctuations are expected, use silicone oils The higher the viscosity of the liquid, the greater its buffer capacity.

The reason for this is that the buffer changes in proportion to the viscosity dependent on the temperature of the filling liquid. The right degree

Damping depends on the performance requirements of the meter must comply, such as pointer response time, extreme pressure, vibration, and changes in pressure. Lenz can recommend specific fluids for applications game problem