Aetna SS-2 Speed & directional sensor (gear teeth)

Speed & directional sensor (use with gear teeth and directional tachometer).

The Aetna SS-2 shaft sender functions as a sensing device for the Aetna Engineering line of Precision Sensitive Digital Tachometers. The SS-2 gives an output pulse whenever a metallic object comes close to the sensing face of the SS-2. The SS-2 may be mounted in a position so that it senses the passage of bolts, gear teeth or “Tach-Tape” on a crankshaft pulley, propeller shaft or transmission coupling. The pulses created by the passage of these metallic objects are then processed by the tachometer to generate accurate RPM information. In addition, the SS-2 determines the rotational direction and provides a signal to Aetna Engineering Precision Sensitive Digital Tachometers with the directional indicating modification to indicate “F” or “R” for forward or reverse.