Sensors for hydraulic cylinders

Particularly robust stainless steel sensors

For the high demands on the sensors in hydraulic cylinder applications, ifm electronic offers a tailor-made in-house development.
The sensor is made of a one-piece stainless steel housing. Thus, the pressure requirements of up to an operating pressure of 500 bar can be implemented permanently. In addition, the robust sensor housing also withstands peak pressures and burst pressures that occur in such applications. The MFH series sensors are sealed by an O-ring and a support ring. On M9H series sensors, the O-ring is inserted radially and provides an additional mechanical end stop during mounting.

The sensor detects the end position on hydraulic cylinders in mobile machines or in forming technology. Usually, a step between the piston rod and the piston is scanned here. The operating principle only detects ferromagnetic metals (steel). In the sensor itself, an electronic magnetoresistive measuring cell (MR cell) detects the permanent magnetic field adjacent to it within the sensor. This MR cell is thus in a permanent magnetic field. Since the stainless steel housing has no influence on the magnetic field, only the ferromagnetic metal of the piston rod will be detected. Thus, a ferromagnetic metal can be approximated and the internal field changes in such a way that the downstream electronics will generate a corresponding switching signal.