Limit value indicator - an instrument mechanism for indication of a preset high or low limiting value

摘要

The limit value indicator with a sensor is for transformation of a mechanical to an electrical signal clips onto a rail and has terminals for connection to an electronic unit. The unit operates a relay when the preset value is exceeded. The enclosure is made of thermoplastic material and houses a clip-and-lock plate for holding a printed circuit and the relay. The enclosure also houses a rotary potentiometer with a barrel indicating scale, indicating arrow and a ratchet wheel for easy setting of the limiting value. The scale is visible through a rectangular opening situated opposite the elastic mounting stud for clipping onto the sheet steel profile rail, which is U-section on both sides. One U-section is.