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Calibration system and calibration method of humidity-temperature sensor

A temperature and humidity sensor and calibration system technology, applied in thermometer testing/calibration, thermometers, instruments, etc., can solve problems such as limited space for adjustment, inability to meet user requirements, and easy formation of dead ends in the test box. Time-consuming, compact results for tuning and approval

Inactive Publication Date: 2009-09-16
CHINA AGRI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, a constant temperature and humidity box is usually used to calibrate the temperature and humidity sensor, which can test the humidity under the condition of changing the temperature of the working area, but the adjustment space is limited, and dead angles are easily formed around the test box, and the accuracy is low , can not meet the user's requirements

Method used

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  • Calibration system and calibration method of humidity-temperature sensor
  • Calibration system and calibration method of humidity-temperature sensor
  • Calibration system and calibration method of humidity-temperature sensor

Examples

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Comparison scheme
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Embodiment 1

[0041] Example 1: Calibration of low-precision mercury thermometers

[0042] Select a certain type of mercury thermometer (range: 0-100°C, accuracy: 0.01°C) to be tested, and install it in the insertion port of the sensor to be tested in the calibration room; check the table to select a suitable saturated salt solution, which is used in this embodiment NaCl saturated solution, put it into the corresponding saturated saline solution container; set the temperature of the temperature control room according to the needs, complete the assembly of the temperature control room, the environment room and the calibration room, and place them in the incubator, turn on the control circuit switch, wait for After automatic stop, read the reading of the mercury thermometer to be tested, compare it with the accurate value, calculate its error, and complete the calibration of the mercury thermometer.

example 2

[0043] Example 2: Adjustment of the two-wire integrated temperature and humidity sensor

[0044] Take the JWS type temperature and humidity integrated sensor commonly used in industrial and agricultural production as an example. %RH, put the probe into the calibration room after packaging, use the two-core signal line to connect the signal output of the temperature and humidity sensor to a certain type of data acquisition board, the data acquisition board has the ability to convert analog signals into digital signals and Packaged into a network signal function, the computer uses a network cable to connect to the data acquisition board through a network hub or a switch, so as to check the temperature and humidity values ​​in real time; look up Table 1 to select a suitable saturated salt solution, and select K in this embodiment. 2 CO 3Put the saturated solution into the corresponding saturated saline solution container; set the temperature of the temperature control room accor...

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Abstract

The invention discloses a calibration system of humidity-temperature sensor, comprising a calibration chamber of which the top is provided with multiple to-be-measured sensor sockets for mounting to-be-measured sensors; an environmental chamber arranged below the calibration chamber and comprising a saturated salt solution container that is used for holding saturated salt solution and arranged in the heat transferring medium of a water bath tank, and the water bath tank; a temperature control chamber arranged below the environmental chamber and used for fast heating or cooling the water bath tank; a thermal container which is used for keeping the measurement environment stable and in which the calibration chamber, the environmental chamber and the temperature control chamber are arranged; and a control circuit for controlling the heating or cooling of the temperature control chamber. The invention also discloses a calibration method of humidity-temperature sensor. The invention realizes the calibration of humidity-temperature sensor by the same system, and is compactly structured, simple and practical. The calibration has small time consumption and is convenient for practical operation. The calibrating device of the invention is simple, has small volume, can realize portable measurement, has cheap material and low cost, and can be popularised and applied in large scale.

Description

technical field [0001] The invention relates to the technical field of temperature and humidity sensor calibration, in particular to a calibration system and a calibration method for a temperature and humidity sensor. Background technique [0002] Temperature and humidity are very important measurement parameters in the fields of industry, agriculture, electronics, chemical industry and aerospace. Temperature is one of the seven basic physical quantities in the International System of Units, and is an important parameter for working fluids and processes. Many processes in nature are closely related to temperature. Humidity is also an important environmental parameter in various fields such as human life and production, and its level can directly affect crop growth and industrial production. With the gradual improvement of living standards, the continuous development of society and the rapid progress of industry and agriculture, the accuracy requirements for temperature and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K15/00G01D18/00
Inventor 滕光辉余礼根王平智戴航
Owner CHINA AGRI UNIV
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