Search for differential pressure on the web? We use steam pressure for their temperature switches : a liquid under pressure is enclosed within a vessel. Under the effect of heat the temperature is transformed into pressure inside the bulb and is thus transmitted to a mechanical bellows converting this pressure into a force. This process has the advantage of not being influenced by ambiant temperature.
Pressure and temperature measurement and differential pressure manufacturer, offers a full range of apparatus and accessories: pressure and temperature switches and transmitters, signals interfaces and equipments as well devoted to hazardous areas.