Electro-Sensors SG1000E Sub-Turn Shaft Position Monitor is a complete position monitoring system housed in a compact and rugged explosionproof NEMA 4X housing. It is an encoder-based position sensor providing a 4-20 mA output and is used to measure a rotary process such as a shaft position having a clockwise or counter-clockwise rotary movement. The SG1000E works on rotary processes having a full-scale sweep as small as 5.6 degrees (fully-closed to fully-open), up through those having a full-scale sweep as large as 130 degrees.