Digital monitoring relay speed monitoring from 0.1 to 2200 rev/min overshoot and undershoot AC/DC 24V DC and AC 50 to 60 HZ startup delay 1 to 900s tripping delayed 0.1 to 99.9s hysteresis 0.1 to 99 rev/min 1 changeover contact w. or w/o error log spring-loaded type
