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一、前言水银导电表这个控温元件,由于使用方便、直观、不怕电磁干扰等特点,广泛应用于各行业的温度自动控制。使用不同温度的导电表,控温范围可达-20℃—+300℃。但是它与电子继电器配套作通断二位式大功率控制,导电表开路电压高(25V),在长时间运行中触点氧化,使可靠性降低。控制不灵敏区大,控温精度低。同时降温需由人工操作,既不均匀又麻烦。我们在DKDP、KDP等水溶液晶体培养中,要求长时间(十个月)的温度精密控制和准确的自动降温。如采用热敏电阻作控温元
I. Introduction Mercury conductive sheet temperature control components, due to ease of use, intuitive, not afraid of electromagnetic interference, etc., are widely used in various industries of automatic temperature control. Use different temperature of the conductive sheet, temperature range up to -20 ℃ - +300 ℃. However, it is equipped with an electronic relay for two-way high-power control. The open circuit voltage of the conductive meter is high (25V), and the contact is oxidized during prolonged operation, which reduces the reliability. Insensitive zone control, temperature control accuracy is low. At the same time cooling by manual operation, both uneven and troublesome. We in the DKDP, KDP and other aqueous crystal culture, requires a long time (ten months) the precise temperature control and accurate automatic cooling. Such as the use of thermistors for temperature control element