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technical article
Knowledge about thermocouple fault detection
2011-10-11 16:38:30

     首先 是显示仪表的热电偶分度号,接着显示仪表量程范围, 然后 测仪表下排的数码管显示设定温度,仪表上排数码管显示测量温度。 After the meter is correctly wired and connected according to the wiring diagram, the thermocouple graduation number of the meter is displayed first , then the range of the meter is displayed, and then the digital tube on the bottom of the meter displays the set temperature, and the digital tube on the top of the meter displays the measured temperature. 仪表上排数码管显示 不是发热体的温度,而 显示“OVER”、“0000”或 “000”等状况, 这就 说明仪表 输入部位产生 故障,应 下检查: If the upper digital tube of the meter does not display the temperature of the heating element, but displays the status of "OVER", "0000" or "000", this indicates that the input part of the meter has a fault, and the following checks should be made :

1) 热电偶从仪表热电偶输入端拆下 然后 用任何一根导线把仪表热电偶输入端短路。 ( 1) Remove the thermocouple from the instrument's thermocouple input terminal first , and then use any wire to short the instrument's thermocouple input terminal. ,仪表上排数码管显示值约为室温 ,说明热电偶内部 连线开路,应 更换同类型热电偶。 When the power is turned on , when the digital tube display value on the meter is about room temperature , it means that the internal wiring of the thermocouple is open, and the thermocouple of the same type should be replaced. 还是以上所说的状况, 说明仪表在运输过程中,仪表的输入端被损坏, 要调换仪表。 If the situation is still the situation mentioned above, it means that the input terminal of the instrument is damaged during the transportation and the instrument needs to be replaced.

2) 上述故障仪表的热电偶 ,换用 另外一个 运行正常的同种分度号仪表上接入的热电偶,通电后, 如果之前的 故障仪表上排数码管显示发热体温度 ,说明热电偶内部连线开路,更换同类型热电偶。 ( 2) Remove the thermocouple of the faulty instrument and replace it with a thermocouple connected to another instrument of the same indexing number that operates normally. After power on, if the previous faulty instrument has a digital tube on the top that shows the temperature of the heating element When it is shown , the internal wiring of the thermocouple is open. Replace the thermocouple of the same type. 还是以上所说的状况,说明仪表在运输过程中,仪表的输入端被损坏,要更换仪表。 If the condition mentioned above still exists , it means that the input terminal of the instrument is damaged during transportation, and the instrument should be replaced.

3) 有故障的热电偶从仪表上拆下来,用万用表放在测量欧姆(R)*1档,用万用表两表棒去测热电偶 两端, 如果 万用表上显示的电阻值很大, 说明热电偶内部连接开路,更换同类型热电偶。 ( 3) Remove the faulty thermocouple from the instrument, use a multimeter to measure the ohm (R) * 1 position, and use the two multimeter rods to measure both ends of the thermocouple . If the resistance value displayed on the multimeter is very If it is large, it means that the internal connection of the thermocouple is open. Replace the thermocouple of the same type. 有一定阻值,说明仪表输入端有问题,应更换仪表。 If there is a certain resistance value, it means that there is a problem with the input terminal of the instrument, and the instrument should be replaced.

热电偶 接线图接线正确, 如果 仪表通电后,仪表上排数码管显示有负值等现象 ,说明接入仪表的热电偶“+”与“-”接错而造成的。 The wiring is correct according to the thermocouple wiring diagram. If the digital tube on the meter displays negative values after the meter is powered on , it means that the thermocouple “+” and “-” connected to the meter are connected incorrectly. 就可以了 Just redo it .

仪表在运行 ,仪表上排数码管显示的温度与实际测量的温度相差30º - 60ºC 或者 甚至相差更大 的时候 说明仪表的分度号与热电偶的分度号搞错 When the meter with correct wiring is running , when the temperature displayed on the top of the meter is different from the actual measured temperature by 30º - 60ºC or even greater , it means that the index number of the meter and the index number of the thermocouple Wrong . 热电偶分度号B、S、K、E等热电偶的温度与毫伏值的对应关系来看, 同样温度的情况下,产生的毫伏值B分度号 最小,S分度号 次小,K分度号 较大,E分度号 最大,按照此原理来判别。 From the corresponding relationship between the thermocouple index number B, S, K, E and other thermocouple temperature and millivolt value, at the same temperature, the smallest millivolt value B index number , S index The smaller the number, the larger the K index number , and the largest E index number , according to this principle.