SLW: Conductivity Type Level Sensor/Switch for conductive liquids

Item Code: SLW

Conductivity Level Limit Switch (Sense the level of Water or other Conductive Liquids that have free ions)
  • Application Temperature Range : Up to 250° C
  • High and Low Field selectable
  • Wetted parts: PTFE, PVC, SS 304 & SS 316
  • Rod & rope type probe
  • Certifications: Flame Proof IIA, IIB & IP65 Housing
  • Probe length: 65 mm to 5m
Principle
A low AC voltage is applied between the probe electrode and the tank wall (or reference electrode in case of insulated tanks). When the liquid comes in contact with the electrode tip, a conductive path is established between the sense electrode and the tank wall / reference electrode. This current is sensed, amplified and made to operate a relay whose contacts in turn can be used for annunciation / control.

Highlights
  • Allows long connectivity between probe and evaluation unit
  • AC on probe prevents electrodes' electrolytic deterioration
  • Low voltage on probe for operational safety
  • No moving parts, longer running life
  • Variety of probes for unique process conditions
Benefits
  • No moving parts, hence free from maintenance
  • No special cable required for signal transmission
  • Economical to install
Applications
  • Switch pumps off when tank is full, to avoid overflow
  • Maintain a constant level to avoid material wastage
  • Switch off pumps when running dry
  • Identify empty tank to avoid wear-tear,production stoppage