High precision low maintenance pH meter

Abstract

The invention discloses a high precision low maintenance pH meter, which includes a shell, a wiring terminal structure and components as well as a signal acquisition and processing system. The wiring terminal structure includes a signal terminal board and a signal terminal, the signal terminal board and the components are located in the shell, the wiring end of the signal terminal is located outside the shell, the front of the shell is provided with a hanger, and the front side of the signal terminal board is equipped with a signal shielding aluminum cover. The high precision low maintenance pH meter provided by the invention not only can protect components and the circuit from external liquid and gas corrosion, but also has the characteristics of convenient production and processing, low making cost, convenient installation and wiring, good heat dissipation effect, good mechanical stability, and wide application range, can "see" the measurement balance point of a sensor very visually, can judge the sensor performance visually, reduce the requirement for the professional skills of users, and improve the correction accuracy and measurement accuracy, lower the probability of incorrect use of a correction solution during correction, and especially can achieve better effect under an outdoor measurement condition and in high precision requirement measurement fields.

Description

technical field [0001] The invention relates to a pH meter, in particular to a pH meter with high precision and low maintenance. Background technique [0002] The pH meter belongs to the category of scientific instruments, which is characterized by weak signal, high impedance and high maintenance requirements. The sensor is easy to age, and the sensor needs to be cleaned, calibrated and replaced regularly. The operating environment is harsh and often has corrosive gases. Therefore, most of the existing domestic pH meters are only suitable for low-end and low-precision industries such as environmental sewage measurement. Under harsh conditions such as chemical, pharmaceutical, and fermentation production, it is difficult to meet the relevant production process requirements. The specific performance is data fluctuation, low precision, poor anti-interference, short service life and so on. However, imported pH meters are almost monopolized by two or three foreign companies. ...

AI Technical Summary

Problems solved by technology

[0006] 1. The input impedance is too low, only suitable for domestic low impedance pH sensors;

[0007] 2. The input impedance is too low, and the data stability is poor when measuring in low temperature medium;

[0008] 3. The signal has poor anti-interference and is susceptible to electric field and magnetic field interference. In winter, the human body's own electrostatic interference will have a great impact;

[0009] 4. The use and maintenance workload is heavy, and professionals are required to use and maintain;

[0010] 5. In harsh environments, the service life is short, especially in environments with strong corrosive gases

The service life of the sensor is quite different due to the different field conditions, sensor quality, and field accuracy requirements.

Judging the performance and life of the sensor requires strong professional knowledge, which is difficult for general field users to do.

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