Sensors & Transducers


Proximity sensors withstand weld-slag

June 2001 Sensors & Transducers

Turck's new Stoneface inductive proximity sensors are robust devices offering durability similar to stainless steel face sensors at standard sensor prices. The sensors' rugged front face is made of an advanced thermoset plastic specifically developed for improved resistance to weld-slag, scratching, pitting and abrasion in MIG, TIG and resistance welding applications. Stoneface sensors are available with unplated brass, stainless steel or Teflon-coated barrels. The new sensors are well suited to applciations in the automotive assembly, body and power train industries where abrasion is a factor.

The unique eurofast connector and mounting bracket allow the sensor to be mounted straight or at a right angle to the cord. An optional bracket is also available for mounting Stoneface sensors at a 0 to 20° rotational angle in applications requiring a precise sensor angle. Cubical models feature a fully-rotatable sensing head that allows them to be mounted in any of five directions, straight up, north, south, east or west for sensing flexibility.

Stoneface sensors are available in Uprox and ferrite-core styles. Both styles are available in flush and nonflush models and feature short circuit, overload, wire-break and reverse polarity protection.

Designed with a nonferrite core, the Uprox models were unaffected by the strong electromagnetic AC or DC fields found in resistance welding operations. These models are capable of sensing all types of metal at the same range, including mild steel, stainless steel, copper, brass and aluminium. This feature allows users to purchase and stock fewer sensors and eliminates downtime for adjustments when target materials change.

Uprox models also feature a patented three-coil circuit design that provides up to 350% more range than standard proximity sensors. The added range allows for more mounting flexibility.

Stoneface sensors are available in 12, 18 and 30 mm barrel style bodies; and Q-style cubical bodies measuring 25 or 40 mm2. They have a repeatability less than and equal to 2% of rated operating distance and are available with NPN (sinking) or PNP (sourcing) outputs. Stoneface sensors are available in 20-250 V a.c. or 10-300 V d.c. models.

Rugged and dependable Stoneface sensors withstand harsh sensing environments and meet IP67 seal rating standards. A wide operating temperature range, -30 to 85°C, enables the Uprox models to perform better in both high and low temperature applications. They may also be mated with a tough minifast cordset.



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