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Rugged Pressure and Temperature Switches for Nuclear Power Stations
The pressure switches maintain a constant pressure around a chosen set value. When the pressure reaches a critical pre-set value, they trigger an alarm or safety system. A flexible diaphragm actuates a micro-switch via a piston. The set point adjustment is realised via a compressible spring mounted on the opposite. Due to the force-balance principle, the dead band setting remains constant, even with different set point adjustments. With rapid pressure variations, an attenuator should be used to prevent a temporary on- and off-switching.
The ZT temperature switches are suitable for all fluids and measuring ranges between -45°C and 350°C. They maintain a constant temperature around a chosen set value and act as regulator of an alarm or safety system when the temperature reaches a critical pre-set value.
The pressure and temperature switches ZPN, ZDPN and ZT offer a very good repeatability (±1% F.S.) making them suitable for all demanding applications. The devices comply with ATEX 94/9/CE requirements for the use in hazardous areas; they are available in an intrinsically safe and an explosion-proof version. Approved by the French electricity board EDF, they are used in nuclear power stations all over the world.
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