The UPG-Stitch is a thread break detector designed to be used on sewing machines. It checks that the thread is moving in stitches. Both no thread movement and continuous thread movement will result in an active output. It operates on the piezoelectric principle, detecting the thread movement. This working principle makes it suitable for all types of threads and insensitive to dust, dirt, and humidity variations.

It has an optocoupler output suitable for PLC or other electronic control devices. A LED (light emitting diode) indicates the thread movement. The ceramic sensor part can be used either as a closed eyelet or as an open bar. Several sensors can also be connected in parallel. With its small size it does not require much space on the machine.