9 - AHP Merkle GmbH

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Adjustable inductive proximity switches
As an alternative to the high pressure inductive proximity switches there is also the option of adjustable inductive
proximity switches. These are not pressure-tight, and detect the cylinder stroke via a rod that extends out of
the pressure chamber to the rear.
These sensors are protected against polarity reversal, but NOT protected against short-circuit.
Magnetic fi eld sensors
The magnetic fi eld switches are very easy to adjust using the slot mounting.
For exact positioning the switch is slid towards the permanent magnetic fi eld generated by the piston until it
switches (image 1). Mark this position.
Repeat the same procedure at the end of the magnetic fi eld and conclude it with a corresponding mark (image 2).
Finally, position the switch in the middle between the two marks and fi x it in place (image 3).
Because of their mode of operation, magnetic fi eld sensors have a relatively wide switching range.
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Mechanical limit switch
Mechanical limit switches are actuated via an external stop or a switch cam. If the switch is actuated via a switch
cam, the switching position can be changed subsequently. The switches are notable for their high switching
current carrying capacity.
Linear position transducer
When installing a linear position transducer, pay very close attention to ensuring that after assembly the linear
position transducer and the hole in the piston and piston rod are optimally aligned; this prevents crushing or
other damage. The simplest way to do this is to move the piston to the piston end as far as it will go and only
then push the linear position transducer through the hole.
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