RPM, speed, frequency display with 2 limits.Reading programmable as 1/s, 1/min, 1/h Input: NPN, PNP, Namur, TTL, 10…600 VAC Two limits SET 1 and SET 2 Sensor supply 5 V, 8 V, 12 V Frequency 0.01 Hz…7 kHz Period duration measurement LED display, 4-digits DIN housing 48 x 24 mm Interface RS485