Intelligent transmitter is composed of sensor and microprocessor (microcomputer) phase structure. It makes full use of the microprocessor's operation and storage capacity, and can process the data of the sensor, including the adjustment of the measured signal (such as filtering, amplification, a / D conversion, etc.), data display, automatic correction and automatic compensation.
Microprocessor is the core of intelligent transmitter. It can not only calculate, store and process the measured data, but also adjust the sensor through the feedback loop so as to achieve the best acquisition data. Because the microprocessor has various functions of software and hardware, it can accomplish the task that traditional transmitter is difficult to accomplish. Therefore, the intelligent transmitter reduces the manufacturing difficulty of the sensor and improves the performance of the sensor in a large range. In addition, the intelligent transmitter also has the following features:
It has the ability of automatic compensation, which can automatically compensate the nonlinearity, temperature drift and time drift of the sensor through software.
It can self diagnose and self check the sensor after power on to check whether all parts of the sensor are normal and make judgment.
The data processing is convenient and accurate, and the data can be automatically processed according to the internal program, such as statistical processing, removing abnormal values, etc.
It has two-way communication function. The microprocessor can not only receive and process the sensor data, but also feedback the information to the sensor, so as to adjust and control the measurement process.
It can store and memorize information, and store characteristic data, configuration information and compensation characteristics of sensors.
It has the function of digital interface output, which can connect the output digital signal with computer or field bus conveniently.
Acid, alkali and salt concentration transmitter
The concentration transmitter of acid, alkali and salt can determine the concentration by measuring the conductivity value of solution. It can continuously detect the concentration of acid, alkali and salt in aqueous solution in industrial process. This transmitter is mainly used in boiler feed water treatment, chemical solution preparation and environmental protection and other industrial production processes.
The working principle of acid, alkali and salt concentration transmitter is: within a certain range, the concentration of acid-base solution is proportional to its conductivity. Therefore, as long as the conductivity of the solution is measured, the acid-base concentration can be known. When the measured solution flows into a special conductivity cell, if the electrode polarization and distributed capacitance are ignored, it can be equivalent to a pure resistance. When there is a constant voltage alternating current flowing through, the output current is linear with the conductivity, and the conductivity is proportional to the concentration of acid and alkali in the solution. Therefore, as long as the solution current is measured, the concentration of acid, alkali and salt can be calculated.
Acid, alkali and salt concentration transmitter is mainly composed of conductivity cell, electronic module, indicator and shell. The electronic module circuit is composed of excitation power supply, conductance cell, conductance amplifier, phase sensitive rectifier, demodulator, temperature compensation, overload protection and current conversion unit.