Level Switch

Written by Jerry Ratzlaff on . Posted in Instrumentation & Controls

Level switch, abbreviated as LS, provides a discrete input to the PLC.  The level switch is typically used as a method of control in tanks and vessels.


Level Switche Types

  • Float Switches
  • Vibration Switches
  • Electromechanical Switch
  • Solid-state Switch


Configuration and Alarms

Configuration (Normal State):

  • NO - Normally Open
  • NC - Normally Closed

Alarms in the PLC can be:

  • LSH - Level Switch High
  • LSL - Level Switch Low
  • LSHH - Level Switch High High
  • LSLL - Level Switch Low Low


instrument abbreviations