我厂温度检测用的切换开关,系板键开关和油浸式切换开关。在使用中,这两种开关都易出现接触不良等故障,在环境腐蚀严重的场合使用,尤其如此。因此,给仪表使用、维护带来了一定困难。聚氯乙烯车间合成岗位,环境较差,温度检测共达四十八点,克服机械切换开关的弊病,对确保仪表运行灵敏、准确,更为迫切。遵照毛主席“独立自主、自力更生”的教导,我们运用可控硅等半导体器件自制了一台自动巡回检测开关。去年九月投运以来,运行良好。实践证明,此开关结构简单、性能稳定、运行可靠、维护方便。原理线路见图1。其与感测元件,二次表配合使用之示意图见图2。 Our factory temperature detection switch, the Department of key switch and oil-immersed switch. In use, these two switches are prone to poor contact and other failures, the environment corrosive serious occasions, especially so. Therefore, the use of the instrument, maintenance has brought some difficulties. PVC plant synthesis post, the environment is poor, the temperature detection of a total of 48 points to overcome the shortcomings of mechanical switch, to ensure the instrument running sensitive, accurate, more urgent. According to Chairman Mao’s “Independent, Self-reliance” teaching, we use SCR and other semiconductor devices made an automatic circuit detection switch. Since commissioning in September last year, it has been operating well. Practice has proved that this switch structure is simple, stable performance, reliable operation, easy maintenance. Principle line shown in Figure 1. Its sensing element, the secondary table with the schematic diagram shown in Figure 2.