目前,各工厂热处理用的电阻炉温度自动控制皆采用电子电位差计。为了防止和避免电炉温度失控在生产环境比较恶劣的条件下使用电子电位差计,我们采取了同时加装了一只XFT-131型动圈式温度指示调节仪,利用XFT-131型动圈仪表作主控,而用电子电位差计做监控、自动记录及超温自动报警。其工作原理如图1所示。图1中K是控制两块仪表的电源开关,K_1是电子电位差计的一组微动开关(中、低)接点,K_2是动圈仪表的常开(中、低)接点,将K_1K_2串联后控制中间继电器J_0的线圈。 XFT-131型动圈式温度指示调节仪是上海自动化仪表六厂的新产品,其抗震性能好,抗干扰能力强, At present, the resistance furnace furnace temperature control of all factories are using electronic potentiometer. In order to prevent and avoid the furnace temperature out of control in the production environment is relatively harsh conditions using the electronic potentiometer, we have also installed an XFT-131-type moving coil temperature indicator regulator, the use of XFT-131 type dynamic coil instrument For master control, but with electronic potentiometer to do monitoring, automatic recording and over-temperature alarm. The working principle shown in Figure 1. K in Figure 1 is the power switch controlling the two instruments, K_1 is a set of micro switch (middle and low) contacts of the electronic potentiometer, K_2 is the normally open (middle and low) contacts of the dynamic instrument, K_1K_2 is connected in series After the control relay J_0 coil. XFT-131-type moving coil temperature indicator regulator Shanghai Automation Instrumentation VI new products, its seismic performance, anti-interference ability,