Optical probe for measurements of rotational speed, designed as retroreflective photoelectric sensor for photoelectric detection of rotational speeds. For evaluation of the pulses, the tachometer probe is equipped with a specific frequency meter module that calculates the number of revolutions per minute from the time period between two pulses. A stable read-out is achieved by averaging over a minimum of 500 ms. Easy application: A reflective adhesive tape is attached to the moving part and the probe is aligned with it. For function control purposes a yellow signal lamp at the rear side of the probe will be on when the reflective adhesive tape is recognised. To increase the operation reliability the sensitivity can be adjusted through a potentiometer. Technical Data: 12/2025 • We reserve the right to make technical changes. Reference object: standard white 100 mm x 100 mm Sensitivity: adjustable with potentiometers Detectable object: opaque or reflector Type of light: red light 640 nm Light spot diameter: appr. 20 mm at intervals of 300 mm Aperture angle: appr. 4 ° Limit for foreign light: EN 60947-5-2: 10000 lux Display switching status: LED yellow Supply voltage: via ALMEMO® connector Connection: Device connector M 12 x 1 including socket M 12 x 1, angled, with 1.5 meters cable and ALMEMO® connector Housing: brass, nickel plated, Lens opening: PMMA Extension cable, 1 meter long ZA9060VK1 Extension cable, 2 meters long ZA9060VK2 Rotational Speed Sensor up to 30000 rpm max., incl. 5 reflective adhesive tapes Connecting cable 1.5 m long with ALMEMO® connector FUA9193 DAkkS accredited calibration or factory calibration KU90xx rotational speed for digital sensor, see chapter „Calibration certificates“. DAkkS accredited calibration meets all the requirements regarding test resources laid down in DIN EN ISO/IEC 17025.