Dr. Livingstone, I Presume WELDWISE 2400 - Manual (Page 97)

0434-INS-400 Rev. C
7-3
Displacement:
• Double Rod End: This type of sensor is an industrial linear potentiometer, utilizing rod ends to
connect it to weld head tooling. The rod end’s spherical bearings take up any minor misalignment
in tooling or brackets, making installation a little more forgiving than a spring return type. This
type of displacement sensor is a very robust unit and is highly recommended by Livingston for
most applications.
• Spring Return: This type of sensor is also an industrial linear potentiometer and is typically used
in situations when the space surrounding the weld force cylinder is limited. When the
potentiometer (pot) is retracted by the weld head tooling, an internal spring allows the pot to extend
with the tooling without actually being connected to it. Special care must be taken to keep the rod
perpendicular to the tooling or side loading may occur.
• Rotary: Some applications (using a rotating pin or pivot) may require the use of a rotary
potentiometer. This type of sensor is a small can with a rotating shaft. The shaft can be coupled to
the pivot transmitting the rotary motion from the pivot to the pot. A rotary sensor is a good choice
when tooling design makes it difficult to mount a linear potentiometer.