The Omron K3HB-RNB 100-240VAC is a panel-mount tachometer from the K3HB-R series, accepting no-voltage and voltage inputs to measure rotational speed or event frequency up to 50 kHz. The 100–240 VAC supply range covers common line voltages without needing an external power module. A 5+5 character dual-color LCD backlit display shows rate and preset values simultaneously, with character heights of 14.20 mm and 4.90 mm for readability across a panel. The IP66-rated front bezel resists dust ingress and water jets, making it suitable for washdown areas or humid control cabinets. External reset via a dry-contact or voltage signal allows the count or rate measurement to be cleared remotely, which is useful for batch-end or cycle-start synchronization on a production line.
Panel cutout is 92.00 mm × 45.00 mm (rectangular), a standard DIN 43700 size that fits existing cutouts for 1/8 DIN instruments. The IP66 front seal is maintained only when the panel gasket is correctly compressed against a flat surface.