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各类干燥设备是工业主要耗能设备之一,节能潜力很大。以胶合板生产为例,单板干燥机耗热量约占整个生产过程耗热量的70％,而其排湿管排气带走的热量又约单板干燥耗热量的30％。因而目前国外各类干燥设备纷纷采用各种湿度自动调节装置,根据排气或机内干燥热气流实际湿度的高低,自动控制排湿管挡板的开启角度,调节排气量。在保证干燥质量的前提下,尽量减少冷空气吸入量,这是提高各类干燥设备热效率的有效途径之一。湿度自动调节装置的关键器件是湿度传感器及相应的变换器。它们不仅需将气体湿度及其变化转换成相应的电信号,而且要求有较好
Various types of drying equipment is one of the major industrial energy-consuming equipment, energy-saving potential. Taking plywood production as an example, the heat loss of the veneer dryer accounts for about 70% of the total heat consumption of the production process, and the heat dissipated by the exhaust pipe of the veneer dryer accounts for about 30% of the dry heat consumption of the veneer. Therefore, all kinds of drying equipment abroad have adopted a variety of automatic humidity control device, according to the exhaust or dry heat flow inside the machine the actual level of humidity automatically control the opening angle of the exhaust pipe damper to regulate the exhaust volume. In ensuring the quality of dry under the premise of minimizing cold air intake, which is to improve the thermal efficiency of various types of drying equipment, one of the effective ways. The key components of the automatic humidity control unit are the humidity sensor and the corresponding converter. They not only need to convert the gas humidity and its changes into the corresponding electrical signals, but also require better