B b sensors shs mod lc dew formation control module b b sensors shs mod lc this module is designed to provide a switched output signal when it receives from a suitable sensor an indication of relative humidity of 94 rh the module connects to a suitable sensor via a 3 pin socket and a 4 pin terminal provides an input for operating voltage and relay output the module output can be used to switch on dryer or heating devices in applications such as cooling surfaces mildew monitors toilets