Pressure switches for infrastructure & thermal management
Typical Application Areas
Expansion devices
on power transformers
Refrigeration systems
Heating systems
Power transformers
In oil-cooled power transformers, hermetically sealed expansion tanks (conservators) compensate for temperature-related volume changes in the insulating oil. If a malfunction occurs, the pressure can continue to rise. In extreme cases, there is a risk of housing failure, explosions, and widespread power outages. The pressure switch detects impermissible pressure conditions at an early stage and enables timely shutdown or alarm notification.
Why our pressure switches are ideally suited:
- Stainless-steel housing for long-term resistance to media and weathering
- FVMQ membrane with high ageing and temperature stability
- Switch points below 500 mbar achievable
- Heavy-duty M12x1 or M12x1 S-coded version
- High repeatability
Refrigeration systems
To operate modern refrigeration systems—especially $CO_2$ systems—efficiently and safely, control of operating pressure is crucial. Fluctuating pressure ranges require components that reliably perform both safety and optimization functions.
A critical point in cooling units (e.g., for CNC machines, laser systems, or fast-charging stations) is cooling-water pressure. If it falls below a critical value (typically approx. 3.5 bar), overheating may occur. Our pressure switches act as a low-water cut-off: they detect the drop immediately and prevent severe machine damage by switching in time.
Why our pressure switch is ideally suited:
- High switching accuracy
- Compact design
- Long-term stable hysteresis
- Cost-effective series solution
Water cooling circuits
Why is 3.5 bar a typical switch point?
This value ensures sufficient flow through the cooling circuit.
Why is accuracy important?
Switching off too early or too late can cause damage.
Are compact designs available?
Yes, for integrated cooling modules.
Is continuous operation possible?
Yes.
Can custom switch points be implemented?
Yes.
Can low hysteresis be set?
Yes.
Are cost-effective series solutions possible?
Yes.
How is operational safety increased?
Through reproducible switch points.
Mindestdrucküberwachung in Heizungsanlagen
In geschlossenen Heizungsanlagen ist ein ausreichender Systemdruck Voraussetzung dafür, dass Heizkreislauf und Umwälzpumpe zuverlässig arbeiten. Sinkt der Druck durch Leckagen, Entlüftungsvorgänge oder Wartungsarbeiten zu stark ab, kann Luft in das System gelangen. Ein zu niedriger Anlagenfülldruck kann dazu führen, dass die Umwälzpumpe nicht mehr ausreichend durchströmt wird und trockenläuft. Mögliche Folgen: Kavitation, erhöhter Verschleiß oder im Extremfall ein Pumpenausfall. Der Druckschalter überwacht den Mindestdruck (typisch ca. 0,7 bar fallend) und löst bei Unterschreitung eine Abschaltung oder Störmeldung aus, bevor Schäden entstehen.
Warum unsere Druckschalter ideal geeignet sind:
- Zink-Nickel-beschichtetes Stahlgehäuse
- Viton-Membran für warmes Wasser
- Korrosionsbeständige Ausführung
- Reproduzierbare Schaltpunkte
Frequently Asked Questions
What function does the pressure switch perform in infrastructure and thermal management applications?
The pressure switch monitors a defined limit value within the system and, if it is exceeded or undershot, sends an electrical signal to the control system. Depending on the application, this can trigger a warning message or shut down a system. This allows critical pressure conditions to be detected at an early stage—for example, a pressure increase on a power transformer or pressure that is too low in a cooling or heating circuit.
Why is a reproducible switch point particularly important for these applications?
Many infrastructure and thermal management applications operate largely unmonitored over long periods. The pressure switch must therefore respond reliably at the intended limit value even after extended operating times. Switching too early can cause unnecessary system downtime, while switching too late can impair the protective function. What is crucial, therefore, is the most stable and reproducible switching behavior possible over the entire service life.
Which electrical connections are suitable for particularly demanding operating conditions?
In addition to the pressure range and switch point, the electrical connection can also be decisive. For applications with increased requirements for mechanical robustness and environmental resistance, heavy-duty versions with an M12x1 connection are available, for example. If higher electrical power is also required, an M12x1 connection with S-coding can also be used—depending on the application and switch version. The connection and contact load should therefore always be considered together with the electrical and mechanical requirements of the application.
What information do we need to select the right pressure switch?
Key factors are operating and system pressure, the desired switch point and switching direction, the medium, temperature range, pressure connection, as well as the electrical load and desired connection type. Depending on the installation location, requirements for housing, diaphragm, and sealing materials, corrosion protection, ingress protection, or mechanical robustness may also apply. On this basis, we assess which standard version is suitable and whether a custom adaptation is advisable.
