How does a manometer work?

A manometer is a measuring instrument which measures the pressure in a confined space of a fluid or gas, such as in a boiler. The pressure relative to atmospheric pressure is indicated by a manometer. But how exactly does a manometer function? How do you select the correct manometer for your situation? And how does one take it into use afterwards? Our specialists explain this in this article.

How does a manometer function?

The way a manometer functions is as follows. A meter contains a cylinder of metal. The springy cylinder of the meter is pressed when measuring a gas or fluid. The cylinder is subsequently deformed, which is converted into a meter, allowing you to read the result.

How to choose a manometer?

The choice of a manometer depends on a variety of variables:

• The amount of pressure (bar) that must be measured by the pressure gauge. Please note: the pressure to be measured should not be greater than 2/3 of the scale of the manometer, so that the possible peak pressure can be absorbed by the meter.
• You want to measure the pressure for which type of fluid or gas you want. For any fluid or gas, not all manometers are suitable. The aggressiveness of substances depends on this. Phosphor bronze, which is not resistant to aggressive gases and fluids, may consist of a manometer. Would you like to measure the pressure of substances that are aggressive? Opt for a resistant material such as rustproof steel, then.
• The ambient temperature and the temperature of the measured fluid or gas.

Glycerin manometer

A liquid, called glycerin, can also be included in a manometer. These glycerin manometers are intended for measurements during which enormous peaks of pressure, vibrations or shocks can occur. The liquid helps to ensure that the pressure in the pressure meter is absorbed. Thanks to its damping effect, glycerin prevents wear.

Installing a manometer

You must properly assemble a manometer in order to avoid leakage. Keep the following points in mind during the assembly:

• Place the manometer in such a way that it is vibration free. Strong vibrations may cause incorrect values to appear on the manometer and can cause damage to the measuring instrument.
• Make sure that the manometer is not too exposed to high temperatures (> 60 ° C).
• Vertical location manometers are calibrated. Therefore, the manometer is still placed vertically. If this is unlikely, then get it adjusted to avoid measuring errors in the desired position.
• Never rotate the casing during (dis-)assembly.

More details about how the manometer works?

Do you have any questions or would you like advice concerning the manometer? Then contact Nick Groenewoud, a specialist in goods, or ask your question using the form below. On working days, we will respond within 24 hours.