Device for recording wheel speed with increased intrinsic safety has primary measurement signal path(s) whose signal normally reproduces encoder movement frequency and/or has patterns representing sensor/encoder pole pairs relative speed

摘要

The device has a sensor (26) with at least two separate signal paths (S1,f1;S2,f2), each including at least one sensor element (S1,S2) and a signal processing stage (28,29), whereby at least one primary measurement signal path (S1,f1) is configured so that its at least one output signal reproduces the simple frequency of an encoder's (25) movement in normal operation and/or contains patterns representing the relative speed between the sensor and the encoder pole pairs. An independent claim is also included for a method of increasing the intrinsic safety of linear and/or rotary movements of a body, especially a wheel.