The Linear PowerProbe should be selected where only linear motion is required and twisting or turning of the sample would be undesirable. An anti-rotation system is fitted internally ensuring straight,in-line motion, despite any rotation of the external drive thimble. This removes the need for the unwieldy and bulky external linear guide bars used by other manufacturers and guarantees no rotation during the stroke.
Furthermore the external drive carriage has only a linear magnetic coupling (no rotary magnetic coupling) meaning no torque is applied to the shaft when rotating the thimble. Fewer parts also means that this linear only version of the PowerProbe is a lower cost than the rotary and linear versions. A retracted switch option is available which provides indication when the probe is fully retracted. This signal can be interlocked to prevent, for example, the premature closing of a gate valve before the PowerProbe has fully retracted.