46 EB 8355-1 EN
Operation
The following applies to positioners with adapter housing for NAMUR attachment:
When the positioner and the position transmitter signal have different operating directions
(<< and <>), it may be impossible to adjust the zero point of the transmitter signal due to the
additional deection caused by the bracket (28) of the adapter housing.
In this case, readjust the black pointer (section 3.2.2 on page22) so that the sensor of the
position transmitter reaches the control range.
Unscrew the clamp. For “actuator stem extends” (FA), shift the pointer upward towards the
actuator; for "actuator stem retracts" (FE), shift the pointer downward towards the valve. For
valves with rod-type yoke, slightly shift the positioner on the rod in the downward (FE) or up-
ward (FA) direction.
Every time you make a change as described above, the zero point and span of the positioner
must be readjusted before adjusting the position transmitter.
After tuning the positioner, make sure that the vent plug of the housing cover faces downward
when the valve is installed.
Note
NOTICE
!
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