压差开关

MP54 / MP55 / MP55A

MP 54 和 MP 55 油差压开关用作安全开关，用 来防止制冷压缩机润滑油压力过低。如果油压下降到设定值以下，油差压开关将在 一定时间后关闭压缩机。MP 54 型和 MP 55 型压差控制器适用于采用 HCFC 和不可燃 HFC 制冷剂的制冷系统。MP 55A 用于使用 R717 的制冷系统。MP 55A 型压差控制器还适用于采用 HCFC 和不可燃 HFC 制冷剂的制冷系统。MP 54 具有固定的压差设置。它还融入了一台 具有固定释放时间设置的热敏时间继电器. MP 55 型和 MP 55A 型压差控制器为可调节压 差型，并且可提供带或不带时间延时继电器两 种类型。

MP55E

MP55E oil differential pressure switches are used as safety switches to protect refrigeration compressors against low lubricating oil pressure.

If the oil pressure fails the oil differential pressure control stops the compressor. MP55E for HCFC, HFC and HC refrigerants are equipped with gold-plated SPDT contacts, which react directly on the differential pressure without time delay.

The units are designed to operate in explosive zones acc. to 2014/34/EU, Atex directive, explosive zone 2, surface equipment, category 3.

MP55E are delivered with ¼ inch solder connections to ensure a hermetic installation.

RT

An RT pressure switch contains a pressure operated single-pole changeover contact, the position of which depends on the pressure in the inlet connection and the set scale value. The RT series includes pressure switches for general applications within industrial and marine refrigeration. The RT series also includes differential pressure switches, pressure switches for neutral zone regulation, and special pressure switches with gold-plated contact surfaces for PLC applications.