Method and device for temperature calibration by means of benzoic acid freezing point temperature level ground

Abstract

The invention belongs to the metering technology field, and concretely relates to a method for temperature calibration by means of a benzoic acid freezing point temperature level ground. The invention also relates to a device adopted by the above method. The method includes the steps of making a benzoic acid freezing point bottle and conducting temperature calibration. The device comprises a benzoic acid freezing point bottle and a benzoic acid freezing point reproduction storage device. The benzoic acid freezing point bottle and the benzoic acid freezing point reproduction storage device are combined together at about 122 DEG C to conduct temperature calibration by means of a benzoic acid freezing point temperature level ground. The beneficial effects of the invention are: firstly, the calibration accuracy is high, and secondly, good reliability is achieved. The method and the device are of practical significance in tracing a specific key temperature spot.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a method for temperature calibration using a benzoic acid solidification point temperature plateau, and the invention also relates to equipment used in the above-mentioned method. Background technique [0002] At present, temperature calibration usually uses the standard thermometer and the calibrated thermometer to be placed in a temperature field (such as a constant temperature bath) to compare the indications, read the readings of the tested thermometer and the standard thermometer, and calculate the indication error or correction value. [0003] The above-mentioned method is currently commonly used, and its disadvantages are as follows: [0004] 1. The standard thermometer will be out of alignment due to factors such as collisions and vibrations, and it is not easy to find out. After the inaccuracy is found, all the data calibrated by the standard thermometer...

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Problems solved by technology

[0004] 1. The standard thermometer will be out of alignment due to factors such as collisions and vibrations, and it is not easy to find out. After the inaccuracy is found, all the data calibrated by the standard thermometer between the time of the inaccuracy and the previous verification cycle should be retrieved according to regulations. Production users bring immeasurable losses

[0005] 2. The temperature field of the constant temperature bath has a great influence on the calibration results. This method is to put the calibrated thermometer and the standard thermometer directly into the liquid of the constant temperature bath. Due to the direct contact with the medium liquid and the positions of the two thermometers are different, the uniformity and fluctuation of the temperature field The stability has a great influence on the calibration results, and the expanded uncertainty of the temperature calibration results is greater than 0.1°C

[0006] 3. If a mercury thermometer is used as a standard thermometer, because it is fragile, the scattered mercury will be difficult to handle and produce toxic mercury vapor.

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