The invention relates to a device for recording with an in increased intrinsic safety linear and/or rotation movements of a body consisting of an magnetic encoder (5,25) and a sensor (26), wherein said magnetic encoder (5,25) is displaceable together with said body and is magnetically coupled to at least two sensor elements (S1, S2) of the sensor (26) by a magnetic air gap, the sensor (26) comprises at least two distinct signal paths (S1, f1; S2, f2) which respectively comprise at least one signal conditioning stage (28, 29), at least one primary measurement signal path (Sl, fl) is produced in such a way that the output signal thereof restitutes at a normal operation the simple frequency of the encoder movement and at least one monitoring signal path (S2,f2) is produced in such a way that the output signal thereof restitutes the double of the encoder movement frequency.