力士乐波登管压力开关HED3是液压-电气压力开关。它们的基本构成是壳体（1），带有触发触点（3）的波登管（2），微动开关（4）和两个调节元件（5）。压力开关所承担的任务是随压力变化接通或断开电路。被监控的压力作用于波登管（2）。波登管（2）发生弯曲，固定在其上的触发触点（3）将波登管（2）的运动传递到微动开关（4）。于是，电路就根据电路的设置接通或断开。当压力继续增加时，波登管（2）将进一步弯曲，这将引发触发触点（3）操作第二个微动开关，并根据电路的设置接通或断开电路。

    切换压力的调节——所需的两个切换压力由微动开关的位置决定，能够在两个调节元件（5）上相互独立地分别进行调节。当使用开关继电器时，切换压差会发生无级变化。

公司可以从德国采购的力士乐波登管压力开关HED 3型号如下：

HED3OA4X/25          HED3OA4X/25Q          HED3OA4X/25L24       HED3OA4X/25L24Q
HED3OA4X/25L110      HED3OA4X/25L110Q      HED3OA4X/25L220      HED3OA4X/25L220Q
HED3OA4X/25K         HED3OA4X/25KQ         HED3OA4X/25KL24      HED3OA4X/25KL24Q
HED3OA4X/25KL110     HED3OA4X/25KL110Q     HED3OA4X/25KL220     HED3OA4X/25KL220Q
HED3OA4X/25K6        HED3OA4X/25K6Q        HED3OA4X/25K6L24     HED3OA4X/25K6L24Q
HED3OA4X/25K6L110    HED3OA4X/25K6L110Q    HED3OA4X/25K6L220    HED3OA4X/25K6L220Q
HED3OA4X/63          HED3OA4X/63Q          HED3OA4X/63L24       HED3OA4X/63L24Q
HED3OA4X/63L110      HED3OA4X/63L110Q      HED3OA4X/63L220      HED3OA4X/63L220Q
HED3OA4X/63K         HED3OA4X/63KQ         HED3OA4X/63KL24      HED3OA4X/63KL24Q
HED3OA4X/63KL110     HED3OA4X/63KL110Q     HED3OA4X/63KL220     HED3OA4X/63KL220Q
HED3OA4X/63K6        HED3OA4X/63K6Q        HED3OA4X/63K6L24     HED3OA4X/63K6L24Q
HED3OA4X/63K6L110    HED3OA4X/63K6L110Q    HED3OA4X/63K6L220    HED3OA4X/63K6L220Q
HED3OA4X/100         HED3OA4X/100Q         HED3OA4X/100L24      HED3OA4X/100L24Q
HED3OA4X/100L110     HED3OA4X/100L110Q     HED3OA4X/100L220     HED3OA4X/100L220Q
HED3OA4X/100K        HED3OA4X/100KQ        HED3OA4X/100KL24     HED3OA4X/100KL24Q
HED3OA4X/100KL110    HED3OA4X/100KL110Q    HED3OA4X/100KL220    HED3OA4X/100KL220Q
HED3OA4X/100K6       HED3OA4X/100K6Q       HED3OA4X/100K6L24    HED3OA4X/100K6L24Q
HED3OA4X/100K6L110   HED3OA4X/100K6L110Q   HED3OA4X/100K6L220   HED3OA4X/100K6L220Q
HED3OA4X/200         HED3OA4X/200Q         HED3OA4X/200L24      HED3OA4X/200L24Q
HED3OA4X/200L110     HED3OA4X/200L110Q     HED3OA4X/200L220     HED3OA4X/200L220Q
HED3OA4X/200K        HED3OA4X/200KQ        HED3OA4X/200KL24     HED3OA4X/200KL24Q
HED3OA4X/200KL110    HED3OA4X/200KL110Q    HED3OA4X/200KL220    HED3OA4X/200KL220Q
HED3OA4X/200K6       HED3OA4X/200K6Q       HED3OA4X/200K6L24    HED3OA4X/200K6L24Q
HED3OA4X/200K6L110   HED3OA4X/200K6L110Q   HED3OA4X/200K6L220   HED3OA4X/200K6L220Q
HED3OA4X/400         HED3OA4X/400Q         HED3OA4X/400L24      HED3OA4X/400L24Q
HED3OA4X/400L110     HED3OA4X/400L110Q     HED3OA4X/400L220     HED3OA4X/400L220Q
HED3OA4X/400K        HED3OA4X/400KQ        HED3OA4X/400KL24     HED3OA4X/400KL24Q
HED3OA4X/400KL110    HED3OA4X/400KL110Q    HED3OA4X/400KL220    HED3OA4X/400KL220Q
HED3OA4X/400K6       HED3OA4X/400K6Q       HED3OA4X/400K6L24    HED3OA4X/400K6L24Q
HED3OA4X/400K6L110   HED3OA4X/400K6L110Q   HED3OA4X/400K6L220   HED3OA4X/400K6L220Q

    HED 3的注意事项：压力开关的用处波登管压力开关只能应用于衰减的机械振动（在安装橡胶缓冲器的情况下）。要补偿泵脉动，我们建议通过测压软管（DN大约2毫米，zui小长度1米）连接压力开关。切换压差要确保切换信号的可靠性，获得的实际压差必须大于压力开关的现有切换压差。切换点的长期漂移 由于设置的切换点会随时间发生变化，压力开关不适用于安全应用。