Amplifier Unit, DC Three-wires models, NO/NC selectable, NPN open collector, Pre-wired models.Sensing head size12 mm x 29.8 mm x 63.1 mmTypeAmplifier UnitPower sourceDC Three-wires modelsOperation modeNO/NC selectable.Sensing head size12 mm x 29.8 mm x 63.1 mmTypeAmplifier UnitPower sourceDC Three-wires modelsOperation modeNO/NC selectable