Method and device for calibrating humidity sensor and sensor arrangement comprising humidity sensor that can be calibrated

A technology of humidity sensor and calibration method, which is applied in the direction of humidity indication, measuring device, instrument, etc.

Inactive Publication Date: 2006-08-09
TESTO AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, this calibration method requires time to adjust the corresponding measured temperature

Method used

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  • Method and device for calibrating humidity sensor and sensor arrangement comprising humidity sensor that can be calibrated
  • Method and device for calibrating humidity sensor and sensor arrangement comprising humidity sensor that can be calibrated
  • Method and device for calibrating humidity sensor and sensor arrangement comprising humidity sensor that can be calibrated

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Embodiment Construction

[0031] FIG. 1 shows a humidity sensor 1 in a gas-tight measuring chamber 2 . The measuring chamber 2 has a first gas connection 3 and a second gas connection 4, with which the measuring chamber can be connected on the one hand to a sufficient pressurizable device 5 and on the other hand to a pressure The hose 6 communicates with another air chamber.

[0032] Furthermore, a pressure sensor 7 is arranged in the measuring chamber 2 . The pressure sensor can be a commercially available pressure sensor, but it should be calibrated and have the highest possible measurement accuracy.

[0033] In order to measure, for example, the gas humidity in the pressurizable device 5 and simultaneously calibrate the humidity sensor 1 , the measuring chamber 2 is first connected to the pressurizable device 5 via a first gas connection 3 , so that gas exchange and pressure equalization can take place. The gas pressure in the measuring chamber is then measured with a pressure sensor 7 and the mea...

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Abstract

For calibrating a moisture sensor (1), the latter is used to measure the relative moisture (U1, U2) at each of two known gas pressure values (P1, P2), likewise to be measured if necessary. At the same time, other ambient conditions are kept constant. A correction value for correction of the measured values of the moisture sensor to be subtracted from the latter is then obtained from the formula: k=((P1 / P2)*U2-U1) / (P1 / P2-1). The moisture sensor (1) is thus capable of calibration without measurement of the actual moisture value.

Description

technical field [0001] The invention relates to a method for calibrating a humidity sensor. In this method, a humidity sensor is used to respectively measure a humidity value under a first environmental condition and a second environmental condition different from the first environmental condition and obtain the humidity value from the two environmental conditions. A calibration value for the humidity sensor is determined from the parameters of the humidity sensor and the measured humidity value. Background technique [0002] Relative humidity in an open or enclosed volume of gas can be measured with a humidity sensor, that is, the amount of moisture dissolved in the gas compared to the maximum amount of moisture dissolved in the gas at a given temperature. [0003] Such measurements are often used, for example, to determine the relative air humidity in various climatic conditions, but also in industry, for example, to determine the relative air humidity in high-pressure gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00F24F6/02G01N27/00G01N25/56G01W1/11
CPCG01N33/0006G01N25/56
Inventor M·罗姆巴赫M·兰根巴赫
Owner TESTO AG
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