Gauge pressure gauges with Bourdon tube (0.6 … 7,000 bar)
The area of application for these pressure gauges with Bourdon tubes is liquid and gaseous media. For measuring tasks in aggressive, not highly viscous and non-crystallising media, even in aggressive environments, the stainless steel variants are suitable. Liquid filling of the case ensures precise readability for the pressure gauge, even with high dynamic pressure loads and vibrations. When it comes to the highest accuracy, within WIKA's broad selection you will also find precision pressure gauges measuring with accuracies of 0.1, 0.25 or 0.6 % of the full scale value. A DKD/DAkkS certificate can be generated for these pressure gauges.
Gauge pressure gauges with diaphragm element for high overload safety (16 mbar … 40 bar)
These pressure gauges with diaphragm pressure elements are suited to gaseous and liquid, aggressive media. Pressure gauges with open connecting flanges are even suitable for highly viscous and contaminated media, in aggressive environments too. Depending on the instrument model and pressure range, an overload safety of 3x or 5x the full scale value is standard. This overload safety is also possible for 10, 40, 100 or 400 bar special designs. The measurement accuracy is maintained. With high dynamic pressure loads and vibrations, a liquid filling within the case of the pressure gauge ensures precise readability. Optional special materials are available for wetted parts.
Gauge pressure gauges with capsule element for very low pressures (2.5 … 600 mbar)
The area of application for these pressure gauges are gaseous media. The scale ranges are between 0 … 2.5 mbar and 0 … 1,000 mbar in accuracy classes from 0.1 to 2.5. The construction of these pressure gauges consists of two circular, corrugated diaphragms, joined together around the rim with a pressure-tight seal. In certain cases overload protection is possible. The pressure gauges are used mainly within laboratory and vacuum technology or medical and environmental engineering for filter monitoring and contents measurement.
Absolute pressure gauges
When measured pressures are independent of the natural fluctuations in atmospheric pressure, absolute pressure gauges are used. The pressure of the measured media is determined against a reference pressure, which corresponds to the absolute pressure zero point. So that there can be a near-perfect vacuum in the reference chamber, this is completely evacuated. The scale ranges for the pressure gauges are between 0 … 25 mbar absolute and 0 … 25 bar absolute, with accuracy classes of 0.6 ... 2.5. These highly precise pressure gauges are used, for example, for monitoring in vacuum packaging machines and vacuum pumps. They are also used for the monitoring of condensation pressures in laboratories or for the determination of vapour pressure in liquids.
Differential pressure gauges
Differential pressure gauges work with a wide range of pressure elements. As a result, measuring ranges from 0 ... 0.5 mbar up to 0 ... 1,000 bar and static overlay pressures up to 400 bar are possible. These differential pressure gauges monitor, e.g., the flow of gaseous and liquid media and the degree of fouling in filtration plants. They are also used for overpressure monitoring in clean rooms and for level measurement in closed vessels. They are also suitable for the control of pumping plants.
Pressure gauges for the measurement of negative gauge pressure (vacuum pressure gauges)
WIKA pressure gauges cannot only be used for the measurement of positive, but also for the measurement of negative gauge pressure. As soon as the absolute pressure is lower than the atmospheric pressure, one refers to it as negative gauge pressure. Previously, this gauge pressure with a negative sign was also designated as underpressure. In order to avoid misunderstandings which might arise from the sign, the designation 'underpressure' is nowadays not used anymore.