Hot air hand drier - has infra-red sensors in mouth of drier assessing radiation and controlling electronic switch for heater

摘要

The hand drier has a control device for reducing the heat output during the drying process. There is a fan mounted behind a heater matrix and at least one infra-red sensor located near the mouth of the drier to assess the heat radiation in the output air flow. The attached control system switches off the power to the heater matrix if an upper heat threshold is reached and reconnects the heater when the temperature of the air drops to a lower threshold. The control system, which comprises an electronic switch with associated circuitry, can also incorporate an electronic switch for the fan. ADVANTAGE - Reduces heat output as hands become progressively drier.