Magnetic encoder with separation of sensor from the environment

Details Magnetic encoder with separation of sensor from the environment Magnetic encoder with separation of sensor from the environment

G - Physics

01

D

G01D 5/12 (2006.01) E21B 47/09 (2012.01)

Patent

CA 2602296

A magnetic encoder for detecting for example movement of a continuous pipe, wire line, pipe joints, rod, etc, into a well includes a wheel in the contaminated environment of the well with a permanent magnet mounted on the wheel such that the magnet moves past a sensing location each time the wheel rotates to provide a count representative of the rotation of the wheel and thus if the forwarding distance of the tubing, A sensor responsive to presence of a field generated by the presence of the magnet is mounted in a cylinder defining a separate environment for the sensor inside the cylinder with a stainless steel end dividing wall separating the wheel from the sensor with a ferro-magnetic pin extending through the dividing wall such that the presence of the magnet at the sensing location causes actuation of the sensor.

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