Resistive linear potentiometers are often used for position feedback in price-sensitive applications. However, since linear potentiometers rely on a contact-based operating principle, they often lack reliability and long-term performance. The Micropulse BIW, which replicates the form factor of traditional linear potentiometers, offers performance and reliability that linear potentiometers cannot. This is made possible by the Balluff-patented, non-contact, Pulsed-Inductive technology, which eliminates premature failure and performance degradation caused by mechanical wear. The Micropulse BIW, available in 0-20 mA and 4-20 mA versions, offers better noise immunity and allow longer cable runs compared to the linear potentiometer’s 0-10 V output signal. Other features include:

• Non-contact measurement technology for wear-free performance and long life
• Fast and easy drop-in replacement with its plunger style linear potentiometer form-factor
• Current output provides a more noise-immune signal

Typical resistive linear potentiometers are especially vulnerable to performance degradation caused by wear to the resistive element. Because the measurement principle relies on mechanical contact between the resistive element and conductive wiper, mechanical wear can lead to erratic output signals and, ultimately, unreliable process control. The Micropulse BIW linear position sensor solves these problems by incorporating noncontact, pulsed-inductive technology into a familiar, plunger style form factor. This patented technology provides high performance and previously unattainable reliability, while the mechanical form factor allows for hasslefree, drop-in replacement of linear pots. The BIW is available in stroke lengths ranging from 75 to 775 mm and offers continuous analog voltage outputs and now analog current outputs. The advantage of the new current output is superior noise immunity and ability for much longer cable runs than the voltage versions.

Hydraulic and pneumatic cylinders are often used as prime movers in industrial applications. In many of these applications, the capability to accurately and continuously monitor the position of the cylinder is desirable.

However, it is often not cost effective to retrofit an existing cylinder to accept an in-cylinder position feedback sensor. The Micropulse BIW is a low-cost, easy to implement solution. The BIW can be mounted directly to the cylinder body. If the cylinder has a locking mechanism that prevents the cylinder rod from rotating, the BIW’s plunger can be coupled directly to the rod. If cylinder rod rotation is a concern, the plunger can be coupled to the load that the cylinder is moving. The result is reliable, accurate, and inexpensive continuous position feedback.

Balluff Inc.