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热加工设备中,大都采用电子电位差计仪表进行测温和控温。为保证设备运行安全,仪表应具有热电偶断路后自动切断加热电源的性能。电子电位差计仪表的断偶保护电路原理是引入一个微小的正向信号,当热电偶未断路时,该信号迭加在正常信号上,对示值影响不大,但当热电偶断路时,这一信号经放大器放大,使指示仪表指向终
Thermal processing equipment, most of the use of electronic potentiometer instrument temperature and temperature control. In order to ensure the safe operation of the equipment, the instrument should have the function of automatically cutting off the heating power after the thermocouple has been disconnected. Electronic Potentiometer meter broken even protection circuit principle is to introduce a tiny positive signal, when the thermocouple has not broken, the signal superimposed on the normal signal, the value of the show little effect, but when the thermocouple open circuit, This signal is amplified by the amplifier to point the meter to the end