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在内燃发动机排气温度的测量中,大都采用了短热电偶作感温一次仪表。我厂也如此。但短热电偶检定是温度计量人员目前深感困难的问题。因为热电偶在制造厂是按部颁对偶丝进行检定的方法检定的。而使用单位在周期检定时,按国家计量总局颁发的“JJG141—73”《0—1300℃工业用热电偶检定规程》要求,热电偶插入管式检定炉内的深度不少于300毫米,以使热电偶工作端进入管式检定炉的最高温场和恒温区。但这些短热电偶其总长度不足300毫米。如我厂在风冷发动机试验台上选用的测排气温度的GR—3型热电偶,插入深度
In the internal combustion engine exhaust temperature measurement, most of the use of a short thermocouple temperature for a time instrument. I plant the same. However, the short thermocouple test is a problem that temperature gauging personnel are currently struggling with. Because the thermocouple in the factory is a ministerial wire method for the determination of the test. The use of units in the test cycle, according to the National Bureau of Metrology issued by the “JJG141-73” “0-1300 ℃ industrial thermocouple test procedures” requirements, the depth of the thermocouple inserted into the tube test furnace of not less than 300 mm to So that the thermocouple working end into the tube furnace temperature and the highest test temperature zone. However, these short thermocouples have a total length of less than 300 mm. As I plant in the air-cooled engine test bench selected exhaust temperature GR-3 type thermocouple, insert the depth