本发明涉及一种设备，用于测量真空的内部压力开关可操作地安装，它由真空开关管的切换室和开关触点和相关联的驱动器的。 已知的是，这样的测量，冷阴极放电（所谓潘宁效应）与交叉的电场和磁场利用，所述电场被施加，例如开关触点中的至少一个和所述切换室或中间缩合屏幕的金属壁，以及其中，所述磁场产生之间 永久磁铁使用。 根据本发明，永久磁铁现在（10; 21 22; 31,32; 40）是杆形的，并且具有这样的形状的磁极片（11，12; 25-28; 35-38; 45-48）上，使得它们的压力测定 在开关真空开关管引入（1）直接在在圆筒形交换室（2）的周缘部的长度方向被施加，其中，所述极片（11，12; 25-28; 35-38; 45-48）的开关室（2）涵盖的金属模具部件 固定并且类似地在开关室（2）用于测量的磁体布置。 通过使用的永久磁铁的数量，测量的灵敏度范围可以被影响。

The invention relates to an apparatus for measuring the internal pressure of an operationally integrated vacuum switch, consisting of vacuum switching tube with interrupter chamber and switching contacts and associated drive. It is known for such measurement, a cold cathode discharge (so-called Penning effect) exploit with crossed electric and magnetic fields, the electric field is, for example, applied between at least one of the switching contacts and a metallic wall of the switching chamber or an intermediate condensation screen and wherein the magnetic field generation permanent magnets are used. According to the invention the permanent magnets are now (10; 21, 22; 31, 32; 40) is rod-shaped and have such a shaped pole shoes (11, 12; 25-28; 35-38; 45-48) in that it for pressure measurement the built-in switchgear vacuum switching tube (1) are directly in the longitudinal direction at a peripheral portion of the cylindrical switching chamber (2) can be applied, wherein the pole pieces (11, 12; 25-28; 35-38; 45-48) metal fittings of the switching chamber (2) engage around and fix both the magnet arrangement on the switching chamber (2) for the measurement. By the number of permanent magnets used, the sensitivity range of the measurement can be influenced.