AER-HL1 - Condensation Detector

Compact device to switch a contact if relative humidity exceeds a high limit setting

The AER-HL1 is a stand-alone electronic detector. It features one internal humidity sensor with 3% accuracy and a latching relays with one normally open and one normally closed contact.

Using a display and programming accessory, the user has the option to read out and reset minimum and maximum values.



  • Prevents condensation for chilled ceilings and beams as well as air handling and fan coil units


  • Supervises humidity levels and switches a relay if relative humidity exceeds the maximum level or if device is without power
  • Stops condensation bevor it happens
  • Very low power consumption:
  • Relays switching for outputs up to 200 W
  • Password protected programmable humidity limits
  • Selectable averaging signal
  • Optional external display (OPA-S) with minimum / maximum humidity limits
  • Status LED


 Item name  Item code   Option  Description
 AER-HL1  40-500071   Standard  1 internal humidity input
 1 relay NO/NC
 AER-HL1-2  40-500099   With 6 ft. (2 m) cable


OPU-S - Remote Display
OPU-S - Remote Display
Operation and display for intelligent transmitters


Operation Manual

Install Sheet