Cranston RI USA
The SONA-TROL ST-6 Ultrasonic Loop Controller can perform up to 100 loop measurements per second to assure that unwind and rewind operations run smoothly. It features a sensor head, which can be mounted from 18" to 20 feet. above a roll or material. If seven consecutive measurements per second are outside of present limits, the unit will sound an alarm. The controller is capable of measuring distance changes down to .010".
Circle No. 165