Profile: Montalvo Corp. manufactures a complete line of web control products. We offer products such as load cells, tension sensing rollers, tension controllers, tension brakes & clutches, safety chucks and tension indicators. Our digital S-3100 closed loop tension controller employs proprietary diamatic control algorithm which insures uniform control response regardless of roll diameter. It is used in unwind or rewind tension applications. The U-3500 ultrasonic tension controller saves four different material settings and is programmable by operator panel or PC software.