|There are applications that are better suited to using a shafted rotary position sensor and others where a touchless (free-floating magnetic) one is a better choice. This tip presents several application situations and which type of sensor is preferred for that application as a guide to help with selection in general.
Applications that benefit from use of a shaft-type sensor
- Applications in which a dancer arm is being used to measure tension of a wire or foil or fabric in a production machine and there is no other shaft available.
- Applications where the sensor needs to be part of a gear box or geared actuator and has a gear on its shaft.
- When replacing a contacting potentiometer type or RVDT-type sensor that had a shaft of same size.
- When the measurement site is very far from where the sensor can be mounted due to design considerations such as extreme heat.
Applications that benefit from a touchless sensor
- Applications where an angle measurement is made through the enclosure or machine wall.
- Applications seeking an IP69K sealed sensor
- When no sensor wear is desired
- Applications that have ultra-high vibration of the rotating shaft
- When a small radial misalignment of the applications rotating shaft may occur
Touchless sensor benefits
- Completely enclosed magnet and sensor for superior sealing properties
- No wear because no contact
- Radial and axial misalignment do not necessarily have to be compensated with expensive couplings
- Vibration from drive shaft / magnet marker does not get transferred to sensor providing maximum robustness
- Flexible mounting of sensor on front or on back of a mounting plate
- Can measure through non-magnetic walls <1/4”.