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A pressure gauge is an important component in heating systems, gas engineering, water supply systems, industry, and many other applications. It is used to measure the pressure of gases or liquids in closed systems. Measuring and maintaining the correct pressure is essential both for proper equipment operation and for safety.
Pressure in closed systems directly affects both the efficiency and safety of their operation. Overpressure and vacuum cause poorer performance, higher consumption, faults, and reduced service life. In the case of overpressure, it may also lead to leaks and the escape of operating media. Such incidents can be very dangerous.
Continuous pressure monitoring therefore not only helps ensure smooth and efficient equipment operation, but also makes it possible to detect technical problems in time. In this article, you will find out how to choose, install, and calibrate a pressure gauge correctly for maximum operational safety.
Choose a pressure gauge according to the application, measuring principle, technical parameters, and additional features. You will need a different pressure gauge for a water supply system, gas distribution, or heating systems, for example.
Pressure gauges are divided into several types according to their measuring principle. The most commonly used are pressure gauges with an elastic measuring element, i.e. with a component that deforms under the measured pressure and transfers this movement to the dial.
These elastic elements may be Bourdon tubes, diaphragms, or bellows. The most common type you will encounter is the Bourdon tube pressure gauge, which is popular for its durability, accuracy, and wide range of applications. For aggressive and contaminated media, diaphragm pressure gauges are used, as they can withstand demanding conditions. In locations with high vibration levels, glycerine-filled pressure gauges are a suitable solution.
Accurate pressure measurement is essential for the safe operation of closed circuits
Pressure gauges are also divided into analogue and digital. While analogue pressure gauges only offer a visual reading from the dial, digital models provide much broader capabilities. Depending on the specific model, they may include functions such as recording measured values or data transmission to a central server or mobile device.
Digital pressure gauges therefore make continuous pressure monitoring easier, support the analysis of measured values over different time periods, and also speed up response times when irregularities occur.
IMPORTANT: Different pressure gauges use different units – bar, pascal, psi. If necessary, the units must be converted.
The key technical parameters are the measured medium and pressure range. For correct installation, it is essential to choose a pressure gauge with the appropriate connection.
You will find high-quality pressure gauges in the ranges of trusted manufacturers such as SUKU and Wilo.
Reliable SUKU pressure gauge
Start by choosing a suitable location – one where environmental influences (vibration, temperature changes) are minimised and which is easily visible for readings. The most common mistake when fitting a pressure gauge is precisely unsuitable placement. If vibration levels at the application site are high, you can use glycerine filling for damping.
Before installation, switch off and drain the system. For this purpose, there should be shut-off valves – gauge cocks upstream of the installation point, allowing you to stop the flow of gas or liquid. After installation, carefully seal all joints. Once the circuit is put into operation, vent the system, carefully check the tightness of all joints, and verify that the measurement is functioning correctly.
The accuracy of pressure gauge measurement is affected by vibration, temperature, and operating load. These and other factors cause measurement deviations over time, which can be dangerous. Pressure gauges must therefore be calibrated regularly and professionally; in some applications, this requirement is laid down by law.
Calibration is a process in which measurement accuracy is tested under laboratory conditions and any undesirable deviations are then corrected. Calibration is carried out by certified technicians. The minimum recommended interval is once a year, but this is shorter for more demanding applications or for pressure gauges with a higher accuracy class. Pressure gauges can be calibrated in a laboratory or directly at the application site.
In addition to calibration, other maintenance steps are also necessary depending on the type of pressure gauge and the manufacturer's recommendations. Check the technical condition of the pressure gauge regularly. Look for cracks, leaks, or incorrect readings. Replace the pressure gauge if defects are found.
Every pressure gauge has a limited service life specified by the manufacturer. Never exceed it. However, it is sometimes necessary to replace a pressure gauge even before the end of its service life, especially if:
In such situations, do not delay replacement. Also remember regular preventive inspections of pressure systems and, in seasonal operation, spring inspection of pressure gauges. Only accurate and reliable pressure measurement will ensure safe and efficient operation.
If you are unsure which pressure gauge to choose, do not hesitate to contact us. Our experienced BOLA pressure technology specialists will be happy to propose a tailor-made solution.
Choose a pressure gauge according to the type of medium (gas, liquid), pressure range, and operating conditions. The measuring principle is also important – Bourdon tube pressure gauges are the most commonly used, while diaphragm gauges are suitable for specific applications. Also take the environment into account, for example vibration or temperature. Last but not least, check connection compatibility and the required measurement accuracy.
Install the pressure gauge in an easily accessible location with minimal environmental influences such as vibration or temperature fluctuations. Before fitting, always depressurise the system and use suitable thread sealing. Installation via a shut-off valve is recommended, as this makes future maintenance or replacement easier. After starting the system, check the tightness of the joints and the correct functioning of the measurement.
The calibration frequency depends on the demands of operation and the required measurement accuracy. In general, calibration is recommended at least once a year, and more frequently in demanding conditions. Calibration consists of comparing the measurement with a reference standard and verifying deviations. In some industries, regular calibration may be mandatory.
A pressure gauge must be replaced if it shows inaccurate or unstable readings. Mechanical damage, leakage, or a sticking pointer are also reasons for replacement. Exposure to excessive pressure is also risky, as it can permanently damage the measuring mechanism. Replacement should also be considered if the equipment is operating under conditions other than those for which the pressure gauge was originally intended.
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