Several types of temperature sensor probe

Temperature sensor is mainly contact type and non-contact type two kinds, the probe is an important part of the temperature sensor, it directly related to the temperature measurement precision and stability.

in general, the temperature sensor probe can be divided into the following three main types:

a, Pierce ( Dip) Type of probe.

the probe is mainly used to measure the temperature of the liquid and solid, front end design of probe into needle, to Pierce. In use process, if the temperature of the probe is lower than the actual measuring the temperature of the object, by the principle of conservation of energy, the heat conduction object to be tested into the probe above; If the temperature of the probe is higher than the actual measuring the temperature of the object, the heat conduction from the probe to the object under test. At this point, the object under test will be heating temperature, the temperature is measured by the object temperature after heating. This case, you must consider the probe and the ratio of medium, the reason is that the probe and the ratio of medium, the better, more accurate measured object access to energy, reduce the measuring error. We want to clear instrument measuring temperature value is not the temperature of the medium, but the temperature of the sensor. The main means to minimize measurement errors are: ensure that Pierce or immersion depth for 10 to 15 times the diameter of the probe; When the medium under test is liquid, try to make it in the stationary state.

2, air temperature probe.

this probe is mainly used for measurement of the temperature of air, such as refrigerator, air-conditioner, air conditioning room, ventilated place, etc. , probe is exposed to air, so it's easy to influenced by airflow disturbances, the best solution is for 2 - in air 3 ms, downstream light moved to probe, make temperature balance and stability.

3, surface probe.

this probe is mainly used for surface temperature measurement. When using the front end of the probe perpendicular to the object under test, and closely contact with the object under test. Must pay attention to is the probe analyte and contact surface must be smooth, otherwise easy to cause measurement error.

when we in the design of a temperature sensor, need to be targeted probe type choice, design a variety of different types of products, suitable for various occasions. At the time of use, according to the probe type, reasonable choice of measuring way, to minimize measurement errors.

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