Combined sensor

Abstract

The invention discloses a combined sensor which includes an interface module, a processing module and a sensing module connected in sequence. The interface module includes a user interface, a processing module side interface, and a power control circuit. The processing module includes an interface module side interface, a processor circuit, a signal processing circuit, a signal sampling circuit, and a sensing module side interface. The sensing module includes a processing module side interface, a signal conditioning circuit, a sensing element, and an excitation circuit. The sensing element senses the parameters of a tested object in an excited or non-excited state, and converts the parameters into electricity. The signal processing circuit preprocesses a signal output by the sensing element, and outputs the signal to the signal processing circuit of the processing module for protecting, filtering and gain post-processing. The signal sampling circuit digitally samples the processed signal. The processor circuit carries out computation on the sampled signal, and exchanges data with the outside through the interface module.

Description

technical field [0001] The invention relates to a combined sensor, in particular to a laboratory or on-line intelligent water quality analysis sensor, which can also be used for industrial process monitoring instruments. Background technique [0002] The types of dissolved and non-dissolved substances in water are very diverse. Due to the different characteristics of the measurement environment, the properties of the substance to be measured, and the measurement concentration, the measurement of these substances also uses a variety of measurement principles and methods. As the "tentacles" of water quality monitoring systems and process control systems, water quality analysis and sensing instruments also have a very rich variety, regardless of whether they are classified according to the type of measurement substance or the basic principle of measurement. The sensor is usually an integrated design, which requires overall calibration and debugging during production, and also r...

AI Technical Summary

Problems solved by technology

As a result, most of the operations for some parts need to face other functional components at the same time.

[0005] 2. It is not conducive to fault location, isolation and maintenance: due to the integrated design of each functional component, the possibility of mutual influence between functional components increases, and the isolation effect is not good when a fault occurs

The failure of such a single functional component may have a cascading effect. Due to the integrated design, it is necessary to detect and eliminate the fault as a whole to locate the fault

This increases the difficulty of maintenance and repair

[0006] 3. High production and maintenance costs: Although the basic parts of the circuits of many similar sensors are similar, due to the integrated design, each sensor must be "big and complete" in order to meet the function, which increases the product variety and the inventory variety

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