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How to solve the protection of the casing caused by the end of the thermocouple error

Release date: 2017-07-20 09:39:02 Visits: 711

Due to the production of special materials, the end face thermocouple than the general thermocouple more quickly and accurately reflect the actual temperature of the measured medium, so more suitable for measuring the bearing pad or other parts of the end surface temperature. However, if the thermocouple installed in the protective casing, then the temperature measurement process may cause errors, these errors mainly from the platinum and rhodium thermocouple itself and the protection of the casing caused by the error. Which protect the casing caused by the error mainly from three aspects:
1. The hotspot of the thermocouple is not inserted into the end of the protective sleeve and is in close contact with the end. At this time the temperature measured by the thermocouple is actually only to protect the end of the casing cavity air temperature.
2. The installation of the protective sleeve is improper and the hot spot of the thermocouple is not guaranteed to be within the measured temperature range. The reason for the protection of the length of the casing is too long or insufficient to protect the casing from the improper installation angle.
3. In the measurement of higher temperatures, the protective casing exposed to the air part of the insulation is not correct, due to conduction heat caused by measurement error.
In general, the temperature of the center of the pipeline is the highest, and the temperature after the deviation from the center of the pipeline will be reduced quickly. Therefore, when installing the protective sleeve, the end of the protective sleeve is required to slightly exceed the center of the pipe to ensure that the hot spot of the end face thermocouple can be at the highest point of temperature, which makes the length of the protective sleeve inserted into the pipe.
For the above problems, we only in the installation process in strict accordance with the provisions of the installation and then a little attention can be avoided, but for the protection of the casing can not be changed at any time after the installation of the design process must be carefully considered in order to ensure The normal use of thermocouples.

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Add: Wuxi City Xinwu District GaoLang East Road 999# Room 506
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