Yarn sensor is used for detecting thread break. The thread runs through a ceramic eyelet. Whenever the thread break is detected the sensor gives an output. This is used in Air Jet Looms for detecting weft yarn breakage and for stopping the loom. It works based on the principle of piezo-electric effect. The sensor has an open-collector output. An LED is provided to indicate the yarn motion. Rocker switch is provided to turn ON/ OFF the sensor. It is technically compatible with original sensors.
Click on the following links to watch video demonstration.