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technical article
Measurement of wear-resistant thermocouples
2011-12-24 10:37:50

针对不同温度范围及被测介质而采用不同的高强度耐磨保护管及表面改性措施,构成复合管型实体化结构本系耐磨热电偶的实用寿命。 Wear-resistant thermocouples adopt different high-strength wear-resistant protective tubes and surface modification measures for different temperature ranges and measured media to form a composite tube-type solid structure. The practical life of this series of wear-resistant thermocouples.

The performance of wear-resistant thermocouples is better than the current wear-resistant thermocouples, which has won praise from users. It has a number of high-tech products at the international advanced level. Many technologies,

Make the temperature measuring thermocouple practical life generally one to two years

测量误差出现的主要影响因素一、插入深度的影响< The main factors influencing the measurement error of wear-resistant thermocouples


1.Selection of temperature measurement point


The installation position of the thermocouple, that is, the selection of the temperature measurement point is the most important. The location of the temperature measurement point must be typical and representative for the production process, otherwise the significance of measurement and control will be lost


2.Insertion depth


When a thermocouple is inserted into the measurement site, a heat flow is generated along the length of the sensor. There is heat loss when the ambient temperature is low. As a result, the temperature of the thermocouple and the measured object are inconsistent, resulting in a temperature measurement error. 2 the impact of response time


The basic principle of temperature measurement by contact method is that the temperature measuring element must achieve thermal equilibrium with the measured object. Therefore, it is necessary to maintain a certain time during temperature measurement to achieve thermal equilibrium between the two. The length of the holding time is related to the thermal response time of the temperature measuring element. Thermal response time

It mainly depends on the structure of the sensor and the measurement conditions. For gaseous media, especially stationary gas, it should be maintained for at least 30 minutes to reach equilibrium; for liquids, the fastest time is more than 5 minutes. For the measured place with changing temperature, especially

It is an instantaneous change process. The whole process is only 1 second, and the response time of the sensor is required in the millisecond level. Therefore, ordinary temperature sensors not only fail to keep up with the temperature change rate of the measured object, but also cause measurement errors due to failure to achieve thermal equilibrium. Best choice

The sensor should be quick. 的测量端直径也是其主要因素,即偶丝越细,测量端直径越小,其热响应时间越短。 For thermocouples, in addition to the protection tube, the diameter of the measuring end of the thermocouple is also its main factor. That is, the thinner the wire, the smaller the diameter of the measuring end, and the shorter the thermal response time. The thermal response error of the temperature measuring element can be determined by the following formula.