Multi-parameter sensor for pH, conductivity and temperature

Abstract

The invention relates to the technical field of water quality detector and particularly discloses a multi-parameter sensor for pH, conductivity and temperature. The multi-parameter sensor comprises a sensor shell and a glass electrode shell and is characterized in that the glass electrode shell is sleeved in the sensor shell, and the sensor shell is further provided with a conductivity measuring component and a temperature measuring element respectively. The conductivity measuring component comprises a first conductive electrode, an insulator and a second conductive electrode. An annular cavity is arranged between the sensor shell and the glass electrode shell, added fluid and compressed gas are filled in the annular cavity, and the glass electrode shell is provided with a liquid adding hole communicated with the annular cavity and the inside of the glass electrode shell. A measuring probe can simultaneously measure the three parameters of pH, conductivity and temperature, and accordingly the sensor is convenient for on-site mounting and unified introducing processing of signals. In addition, the cost performance of the multi-parameter sensor is increased greatly, and the service life of the multi-parameter sensor is prolonged greatly.

Description

technical field [0001] The invention relates to the technical field of water quality or solution parameter detection devices, in particular to a pH value, conductivity and temperature multi-parameter sensor. Background technique [0002] In industrial production or environmental protection, the detection of solution parameters or water quality is the basic requirement for industrial control. Usually the detection and analysis of solution or water quality involves multiple parameters such as temperature, pH value and conductivity. Most of the current sensors of the same type have a single function. In the case where multi-parameter detection is required, it is generally necessary to set up different sensors separately. This setting not only makes the measurement facilities cumbersome and inconvenient for the unified processing of parameter signals, but also causes errors in the comprehensive analysis of solutions or water quality due to the differences in the installation po...

AI Technical Summary

Problems solved by technology

Most of the current sensors of the same type have a single function. In the case of multi-parameter detection, it is generally necessary to set up different sensors separately.

This setting not only makes the measurement facilities cumbersome and inconvenient for the unified processing of parameter signals, but also causes errors in the comprehensive analysis of solution or water quality due to the difference in the installation position of each sensor, and the single function of the sensor also increases the use and manufacturing costs.

[0003] In addition, since the reference buffer solution needs to penetrate into the measured solution through the salt bridge during the test of the pH glass electrode, it inevitably causes the following problems: First, the concentration of chloride ions in the reference solution is gradually changing, causing the measurement results slow drift

In the measurement occasions that require very high pH accuracy, it is necessary to calibrate the electrode frequently, which is not only troublesome, but also not conducive to continuous measurement; second, when the pressure of the reference solution is lower than the pressure of the solution to be tested, it will The reverse osmosis of the solution to be tested to the reference solution through the salt bridge will cause measurement inaccuracy and even sensor failure; the third is that with the loss of the reference solution, the measurement accuracy will not meet the requirements, and the sensor will be scrapped , short service life

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