Bb sensors con regme rain detectors bb sensors con regme 24 v the sensor surface responds to rain or snow adjustable switching polarity and sensitivity the onoff ptc heater prevents icingcondensation and accelerates drying at its most sensitive setting the device can also detect fog reliable electrolytic principleapplications nurseries agriculture control of ventilation ports roof windows awnings shutters and building control systems bb sensors con regme 24v rain detector