Pressure transmitter is a more familiar kind of controller in manufacturing practice activities. It is commonly used in various manufacturing automation control natural environment, touching water conservancy and hydropower engineering, high-speed railways, building intelligence, production automation control, aerospace, military, petrochemical, oil wells, power engineering, ships, CNC lathes, pipelines, and many other jobs.
The pressure transmitter uses a piezoresistive sensitive core, which has a compact volume and increased skill. Its characteristics are mainly reflected in its sensitive core. The basic principle of the piezoresistive intelligent transmitter is that the sensitive core is subjected to a force that causes the resistor to change. Then we convert the change in the resistor into a standard data signal output according to the expansion power circuit.
The following is a brief detailed introduction to the basic principles of some standard pressure transmitters and their applications. Pressure transmitters are used to accurately measure liquid, vapor, or steam level instruments, pressure transmitters relative density, and working pressure, and we subsequently convert the working pressure data signal into a 4 to 20mA DC data signal output.
1. Difference between a pressure transmitter and a pressure gauge
1.1 Different concepts
A pressure gauge is an instrument that uses an elastic element as a sensitive element, which measures the indication above the ambient pressure. It is widespread in its application and present in almost all industrial processes and scientific fields.
1.2 Different methods of use
Pressure transmitters are used in active control. The pressure gauge is installed directly in the pipeline and picks up the pipeline pressure now.
1.3 Differences in working principle
The pressure transmitter is applied in the positive chemical manipulation. Pressure transmitter in the requirement to take the pressure of the pipeline, it is to vapor, liquid and other working pressure data signal into a standard current-voltage data signal, to supply and demand balance mark alarm instrument, video instrument, controller and another secondary surface, to carry out the measurement, marking and system process adjustment.
The pressure gauge is designed to display the pressure through the elastic deformation of the sensitive components (Boden tube, membrane box, bellows), which is then transmitted to the pointer by the conversion mechanism in the gauge movement, causing the information to rotate.
2. Pressure transmitter selection pressure point requirements meet the following content criteria
2.1 When we measure air pressure, we take the pressure point at the upper part of the process line.
2.2 When we measure the working pressure of the liquid, we take the pressure point should be in the lower half of the processing pipeline. In addition, it should be within the range of 0~45 degree intersection angle with the level axis of the processing pipeline.
2.3 When we measure the working pressure of steam, we take the pressure point in the upper part of the processing pipeline and its lower part. Therefore, it should be within the range of 0~45 degree intersection angle with the level axis of the processing pipeline.
2.4 When we work in the direction of the equipment from which the pressure is taken from the source component, we should choose a pipe where the process material flows smoothly.
2.5 When our working pressure source component and temperature source component are at the same pipeline, the working pressure source component should be equipped on the upstream and downstream sides of the temperature source component.
2.6 Our working pressure is taken from the beam end of the source component. Therefore, it must not exceed the inner cavity of the process technology and the process line.
2.7 when the pressure transmitter in the vertical processing process pipeline measurement containing dust, solid particles, or precipitation, turbid substances need to work pressure, we take the source components should be tilted upward equipment, so that it should be more than 30 degrees of the intersection angle with the horizontal plane, in the level processing process pipeline is suitable for downstream bundle into obtuse angle equipment.
2.8 The pressure transmitter equipment direction should be light source abundant, the actual operation and maintenance convenient, and it is not suitable for equipment in shock, wet and cold, high temperature, with corrosion and magnetic solid field intrusion of the area.
2.9 pressure transmitter equipment direction should be as close as possible to take the source components. Measuring the bottom pressure of the intelligent transmitter equipment height to width ratio is appropriate to the same height as the pressure taking point, especially in is measuring liquid substances and condensable gas substances.
2.10, we measure the working pressure of vapor substances. The intelligent transmitter equipment direction should be higher than the pressure taking point. When calculating the operating pressure of liquid or vapor, intelligent transmitter equipment direction should be less than the pressure taking point.
Pressure transmitter is a professional technical industry in the field of application, and it is also ubiquitous equipment, it is done as a technical professional used to measure off the working pressure of the material induction instrument panel, pressure transmitter initial scientific research on the basic principle of the basis of Rose working voltage magnetic induction theorem. At present, in our production of intelligent pressure transmitters, it has also long maintained a sizeable digital excitation pressure. It uses the CAN Fieldbus in the pressure transmitter on the side. The pressure transmitter uses the controller embedded technology as the primary technical nature of itself.
The pressure gauge is the use of the expansion tube inside the table to sense the pressure and drive the gear mechanism to make the pointer rotation display pressure; pressure gauge structure is simple, is easy to use, display intuitive, it can be arbitrarily installed in a variety of pipelines, its disadvantage is that the measurement accuracy is not high.
pressure transmitter is the use of electronic sensing components that will be converted into a standard analog signal, it can be easily collected and transmitted over long distances to the instrument, PLC, and computer systems, it has a relatively high measurement accuracy, it needs to have a power supply and configuration of the corresponding display instrument when used.