
Instruction Manual
D103621X012
4320
January 2018
15
Valve / Actuator Mounting
If ordered as a part of a control valve assembly, the factory will mount the 4320 on the actuator and calibrate it. If you
purchased the instrument separately, you will need a mounting kit to mount it on the actuator. The following
procedures are general guidelines you should consider when mounting the 4320. See the instructions that come with
the mounting kit for detailed information on mounting to a specific actuator model.
Note
All mounting materials should be non-ferrous. Ferrous materials are magnetic and may affect feedback.
The feedback system for the 4320 utilizes a magnetic field for true linkage‐less, non‐contacting position
measurement. In order to prevent inadvertent stem movement while the instrument is in operation, magnetic tools
(such as a magnetic‐tipped screwdriver) should not be used.
CAUTION
The magnet material has been specifically chosen to provide a long‐term stable magnetic field. However, as with any
magnet, care must be taken when handling the magnet assembly. Another high powered magnet placed in close proximity
(less than 25 mm) can cause permanent damage. Potential sources of damaging equipment include, but are not limited to:
transformers, DC motors, stacking magnet assemblies.
CAUTION
General Guidelines for use of High Power Magnets
Use of high power magnets in close proximity to this instrument should be avoided.
Use of Magnetic Tools
D
Magnetic Tip Screw Drivers – Magnetic tip screw drivers can be used to work on the 4320.
However, they should not be brought in close proximity to the magnet assembly (located
at the back of the instrument) during process operations.
Note
As a general rule, do not use less than 50% of the magnet assembly for full travel measurement. Performance will decrease as the
assembly is increasingly subranged.
The linear magnet assemblies have a valid travel range indicated by arrows molded into the piece. This means that the Hall sensor
(on the back of the 4320 housing) has to remain within this range throughout the entire valve travel. See figure 8.
The linear magnet assemblies are symmetrical. Either end may be up.