Why is glycerin oil used in sphygmomanometers?
Glycerin is the most common liquid used in gauges. This oil is very suitable for gauge vibrations. These tools work well in temperatures between -4 degrees Celsius to + 140 degrees Fahrenheit (-20 degrees Celsius and +60 degrees Celsius).
Other fluids used in pressure gauges
Silicon: They have lower viscosity than other comparable oils, even at very low temperatures. Therefore, silicon-filled gauges are better for applications with extreme temperature changes, especially in colder climates and when frost is expected. Their operating temperature range is from -40 ° F to + 140 ° F (-40 ° C to + 60 ° C).
Halocarbon: Halocarbon gauges are suitable for applications that include oxidizing agents such as chlorine, oxygen, and hydrogen peroxide. They operate in the same temperature range as glycerin, from -4 ° F to + 140 ° F (-20 ° C and + 60 ° C).
Why oil is used in gauges:
Advantages of using pressure gauges filled with oil:
- The oil absorbs vibration.
- The oil allows the operator to read during dynamic loads and rapid vibration conditions.
- The fluid lubricates all moving elements, which drastically reduces wear and tear on movement.
- Because most oil-filled gauges work in corrosive environments, they are protected from moisture penetration and frost, and reduce the effects of shock.
- Liquid gauges enhance the reliability and integrity of the measurement system for long periods of time under severe operating conditions.
How to choose the right fluid pressure gauge?
The type of oil used to fill gauges varies with application. Although pure glycerin provides the best performance in most applications, each has its own needs. Instructions are provided to help ensure proper compliance with a program:
- If freezing is a problem, use indicators filled with silicone oil or other comparable liquids. They have low viscosity even at -60 degrees Celsius.
- If the system has electrical accessories such as contacts, use insulating oils.
- If severe temperature fluctuations are predicted, use silicone oils. The higher the viscosity of the liquid, the greater its buffer capacity.
This is because the buffer varies with the viscosity ratio depending on the temperature of the filler fluid.
Damping depends on the operating needs of the gauges, such as indicator reaction time, high pressure, vibration and pressure changes. The lens can recommend certain fluids for the problem of playing programs.
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