The main influencing factors of platinum rhodium thermocouple measurement error

1. Selection of temperature measurement point The installation position of WRP-130 platinum rhodium thermocouple, that is, the selection of temperature measurement point is important. The location of the temperature measurement point must be typical and representative for the production process, otherwise it will lose the meaning of measurement and control. 2. Insertion depth When the thermocouple is inserted into the measured location, heat flow will be generated along the length of the sensor. When the ambient temperature is low, there will be heat loss. As a result, the temperature of the thermocouple is inconsistent with the temperature of the object to be measured, resulting in temperature measurement errors. In short, the error caused by heat conduction is related to the insertion depth. The insertion depth is related to the material of the protection tube. The metal protection tube should be inserted deeper (approximately 15-20 times the diameter) because of its good thermal conductivity. The ceramic material has good thermal insulation properties and can be inserted shallower (approximately 10-15 times the diameter). For engineering temperature measurement, the insertion depth is also related to whether the measurement object is stationary or flowing. For example, the measurement of the temperature of flowing liquid or high-speed airflow will not be subject to the above restrictions. The insertion depth can be shallower, and the specific value should be determined by experiment. 3. The influence of response time The basic principle of contact temperature measurement is that the temperature measurement element must reach thermal equilibrium with the measured object. Therefore, it is necessary to maintain a certain period of 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. The thermal response time mainly depends on the structure of the sensor and the measurement conditions, which vary greatly. For gaseous media, especially stationary gas, it should be kept for at least 30 minutes to reach equilibrium; for liquids, it must be at least 5 minutes.

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