|信息来源： 液位变送器厂家 | 2020-06-11 点击量： 1965|
The necessity of field calibration of 3151 intelligent liquid level transmitter / pressure (differential pressure) liquid level transmitter is an important part of the process detection and control system in the process of production process automation. Its function is to convert the measured process parameters such as pressure into the corresponding electrical (gas) signal of the same scale, and then send this signal to other units to realize the active detection or adjustment of the above process parameters in the process of liquid level measurement.
As a kind of digital communication network, fieldbus system has changed the analog signal transmission from point-to-point to serial digital transmission. Therefore, the field bus type intelligent pressure / differential pressure liquid level transmitter greatly reduces the analog signal in the system, thus almost eliminating the loop error. And full digital two-way communication not only improves the measurement and control accuracy of the system, but also makes the system configuration and debugging more convenient. The setting of intelligent pressure / differential pressure liquid level transmitter function module and data transmission and exchange can be completely realized by digital communication tool or upper computer interaction.
The necessity of field calibration of 3151 intelligent liquid level transmitter / it should be selected according to the needs.
The pressure / differential pressure level transmitter shall be installed at the lower part of the equipment, and the input type level gauge shall be installed at the upper part of the equipment;
The installation of pressure / differential pressure level transmitter is relatively complex, and the input level meter is convenient for installation;
The pressure / differential pressure liquid level transmitter can measure the liquid level of the tank with pressure, and the input liquid level meter can only measure the atmospheric (open) container\
The complex situation in the vessel (such as water flow and agitation) has little influence on the pressure / differential pressure level transmitter. The input level gauge requires quietness in the vessel.
Therefore, the output signal in the loop should be monitored and adjusted by the digital communication tool and the upper computer in the application field. At the same time, because there is no analog signal transmission, the calibration of Fieldbus intelligent pressure / differential pressure level transmitter becomes the calibration and traceability of single process variable value. That is to say, standard process variable is applied to the necessity of field verification of Fieldbus intelligent 3151 level transmitter by standard process variable source / pressure / differential pressure level transmitter, and the digital output of Fieldbus intelligent pressure / differential pressure level transmitter is monitored by digital communication tool or upper computer (the same measurement unit as standard process variable source can be set), and The intelligent pressure / differential pressure level transmitter based on fieldbus is calibrated by single process variable range and linear comparison.
Because the field bus loop is a complete digital signal loop, the output signal in the loop should be monitored by digital communication tools. In the application field, the upper computer can realize data monitoring and at the same time, because there is no analog signal transmission, the verification of the field bus intelligent pressure / differential pressure liquid level transmitter becomes the calibration and traceability of a single process variable value. That is to say, the standard process variable is applied to the field bus intelligent pressure / differential pressure level transmitter by the standard process variable source, and the digital output of the field bus intelligent pressure / differential pressure level transmitter is monitored by the digital communication tool or the upper computer (the same measurement unit as the standard process variable source can be set), and the linear comparison is made by the single process variable range Calibrate the fieldbus type intelligent pressure / differential pressure liquid level transmitter.
The specific calibration time is field bus network access and laboratory single meter calibration. For fieldbus network segment, digital communication tools can be connected at any convenient position of the bus network segment, usually in intelligent pressure / differential pressure level transmitter and Fieldbus junction box
3151 high temperature input liquid level transmitter features:
High precision measurement, not affected by the foaming, deposition and electrical characteristics of the measured medium, wide range of temperature compensation
Solid structure, no movable parts, high reliability, long service life, from water and oil to paste with high viscosity
Good stability, high precision, can work in high temperature environment
It is directly put into the tested medium, which is quite convenient for installation and use
Relying on the advantages of professional technology, reliable and stable product quality, Huaheng instrument manufacturer insists on meeting the needs of users to a large extent, which is the power source of enterprise development. With high-quality professional services, it provides industrial automation instrument products with high performance price ratio for China's electric power, petroleum, chemical industry, metallurgy, cement, mining, municipal administration, papermaking and other industries. It has made an important contribution to the development of automatic instruments in China.