ER-104/B/2W Electrode Relay – Key Features

• Function: Designed for conductive level detection in liquids using immersion electrodes or signal pickups.
• Applications:
  • Limit level detection (e.g., overflow, dry run)
  • Min./Max. control
  • Pump control with hysteresis
  • Contact protection relay for low-load signal pickups
• Working Principle:
  • Electrodes immersed in conductive liquid generate a low AC voltage.
  • This current is evaluated by the switching amplifier.
  • Relay switches when the current exceeds an adjustable trigger point.
• Adjustable Working Direction:
  • Closed circuit: Relay activates when electrodes are dry.
  • Open circuit: Relay activates when electrodes are wet.
• Construction:
  • Slimline housing (22.5 mm width) for space-efficient installation
  • Composed of three functional units:
    • Power supply
    • Switching amplifier with hold function
    • Switching relay with SPDT output
• Output: Potential-free SPDT contact for flexible integration
• Compatibility: Works with immersion probes, float switches, pressure bell switches, and other signal pickups