Functional as well as ecological
Truth moved into new premisesOnly a few steps, but a giant leap: WIKA’s new head offices for the Danube region were erected only a few hundred metres from the present location in a construction period of only nine months. The move into the new building took place at the turn of the year as planned.With […]
MTTF and MTTFD – What is the difference?
What is the MTTF value?The MTTF value is a term from the field of risk analysis & risk evaluation. The exact meaning is mean time to failure or simply the mean life of a component. The MTTF has gained particular relevance due to EN ISO 13849-1. In accordance with this standard, the performance level can […]
Drinking water suitability of measuring instruments
In connection with the drinking water suitability of measuring instruments, the terms Drinking Water Directive, 4MS List, UBA Positive List, Evaluation Criteria for Metallic Substances are increasingly appearing. Mediocre should shed some light on the suitability of metallic materials.For the benefit of European citizensAs shown in fig. 1, directive 98/83/EC (Drinking Water Directive – DWD) […]
Electrical circuit for pressure sensors: when is really a sensor active, so when passive?
When using pressure sensors, the output signals 0 ? 20 mA, 4 ? 20 mA and DC 0 ? 10 V are generally chosen in order for the sensor signals to be evaluated and additional processed. For this, the signal output of the pressure sensor is normally connected to a corresponding input card in the […]
SIL 2 and SIL 2 does not automatically equal SIL 2
When using pressure sensors in safety-relevant applications, sooner or later one must ask the question whether the SIL evaluation of the proposed pressure sensor is sufficient for the application. Often, the user tends to favour pressure sensors with higher SIL classifications because these supposedly offer higher safety than sensors with a lower classification.Unfortunately, in the […]
How do diaphragm seals work?
Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument. Greedy has two primary tasks:1. Case Study of the measuring instrument from the process medium2. Transfer of the pressure to the measuring instrumentOperation […]
Fields of application for pressure sensors 1 – vented gauge pressure sensors vs. absolute pressure sensors
The user is often faced with the question: What kind of pressure sensor should I use – a relative/gauge or an absolute pressure sensor? From food processing to petrochemical plants, to plastic injection moulding and many other industrial applications, pressure measurement is needed for the control of processes and machinery. In this series of articles […]
Mechanical pressure switches: What principle do they work on?
Mechanical pressure switches in compact design ensure safe pressure monitoring in, for example, pumps, compressors and mobile working machines. Whatever the application, they function relative to the principle of the preloaded spring, with a diaphragm or perhaps a piston because the measuring element.Mechanical pressure switches including the PSM01 (see illustration) are constructed relative to the […]
What is an electronic pressure switch?
As soon as a preset pressure is reached, an electronic pressure switch opens or closes a corresponding switch contact. There are various designs of electronic pressure switches which are used in a multitude of industrial and technical processes. Particularly in machine building, electronic pressure switches are frequently used. The advantages of the electronic version of […]