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Baumer has launched the ZPN, ZDPN and ZT series pressure and temperature switches developed specifically for use in nuclear power stations.

The company said the pressure switches are suitable for pneumatic or hydraulic control, for power generation safety equipments and for pressurised chambers control.

They are resistant to short duration overpressure and show a good vibration resistance.

The ZPN can measure a gauge pressure from -1 bar up to 600 bar with a small intermediate range from -2 mbar up to 10 mbar.

The ZDPN measures a differential pressure from 2 mbar up to 120 bar.

The pressure switches maintain a constant pressure around a chosen set value.

When the pressure reaches a critical preset 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 -45C and 350C.

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 preset value.

The pressure and temperature switches ZPN, ZDPN and ZT are said to offer a good repeatability (1 per cent FS) making them suitable for 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.

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