SS421H Datasheet, PDF (1/5 Pages) Honeywell Accelerometers – Honeywell Sensing and Control

SS421H
SS421H Adjustable Hall-effect
Underspeed Detector (Active - High);
SIP-4 radial lead IC package
Actual product appearance may vary.
Features
q Wide temperature ranges for design
flexibility
q Temperature compensated for
consistent operation with low-cost
magnets
q Bipolar operation for easy RPM
counting using ring magnets
q Built-in timing circuit greatly
simplifies and reduces the cost of PC
board design
q Speed trip point adjustable with
external resistor and capacitor
Potential Applications
q Under-speed detection for fans
q Conveyors
q Motor control
q Power-up fault failure filter in motor
start-up
Description
The SS421 Series Adjustable Hall-effect Under-speed Detectors are designed to
monitor fan or motor performance. This temperature-compensated, Hall-effect IC
contains a timing circuit and logic, that senses magnetic input frequency. The
internal circuitry contains a timer so that one or two pulses at a slower repetition
rate than the set point do not produce an unwanted output.
A small amount of hysteresis has been built into the output so that operation right
at the set point does not result in a chattering output. The user simply provides an
external resistor and capacitor combination to select the RPM trip point that will fit
the particular application.