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

A technology of benzoic acid and freezing point, which is applied in the field of measurement, can solve the problems that the uniformity and fluctuation of the temperature field have a great influence on the calibration results, the temperature field of the constant temperature bath has a great influence on the calibration results, and mercury is not easy to handle mercury vapor, etc. Achieve good stability and reproducibility, improve temperature field accuracy, and eliminate uniformity

Active Publication Date: 2015-11-25
济南长峰致远仪表科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Effect test

Embodiment 1

[0036] The method that utilizes benzoic acid freezing point temperature plateau to carry out temperature calibration at 122 ℃, comprises the following steps:

[0037] (1) Production of benzoic acid freezing point bottle:

[0038] The inner wall of the benzoic acid freezing point container is washed successively with organic solvent, lye, dilute nitric acid, and three times of purified water, and dried; the benzoic acid with a purity of 99.98% purified by physical sublimation is put into the above-mentioned container and vacuumized Then close the container. After the benzoic acid freezing point bottle is made, it can be used repeatedly, the number of times is more than 300 times, and the service life is more than 1 year.

[0039] After the above-mentioned purified benzoic acid is loaded into the benzoic acid freezing point container, it is the benzoic acid freezing point bottle.

[0040] (2) Temperature calibration:

[0041] Place the benzoic acid freezing point container in...

Embodiment 2

[0049] In the equipment utilizing benzoic acid freezing point temperature plateau for temperature calibration of the present invention, the volume of benzoic acid freezing point bottle 5 is about 300mL, and the depth of thermometer well 2 is 200mm. It needs to be washed with organic solvent, dilute nitric acid, and three times of purified water in sequence, and dried in a drying oven. Put in benzoic acid with a purity of 99.8% after being purified by methods such as physical sublimation. After vacuuming, the container is sealed.

[0050]The temperature control range of the benzoic acid freezing point reproduction storage device 6 is from room temperature to 250°C, the temperature uniformity is ≤0.01°C, and the temperature fluctuation is ≤±0.01°C / 10min. With programmable program temperature control function, with temperature fluctuation display, continuous working time display, upper and lower limit temperature setting, temperature arrival buzzer alarm and other functions, equi...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K15/00
Inventor 隋峰王云刘平梁兴忠于清许爱华郭波张炯孙华
Owner 济南长峰致远仪表科技有限公司
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