HANYOC-4751 pressure transmitter

Differential pressure transmitter

HANYOC-4751DP102M3Z， ± 100KPa, accuracy 0.075%, 24VDC, 4-20mA+HART, IP67, with three valve group

Differential pressure transmitter

HANYOC-4751DP102M3Z， ± 1000Pa, accuracy 0.075%, 24VDC, 4-20mA+HART, IP67, with three valve group

Pressure transmitter

HANYOC-4751GP402M3D，0~4MPa， 精度0.075%， 24VDC，4-20mA+HART，IP67

Pressure transmitter

HANYOC-4751GP402M3D，0~6MPa， 精度0.075%， 24VDC，4-20mA+HART，IP67

Pressure transmitter

HANYOC-4751GP402M3D，0~8MPa， Accuracy 0.075%, 24VDC, 4-20mA+HART，IP67

1、 Working principle

HANYOC-4751 pressure transmitterThe working principle of is based on Poisson's law, which states that the pressure of a gas or liquid in a static state is proportional to its density. It calculates parameters such as fluid flow rate, liquid level, density, etc. by measuring the differential pressure between two pressure points. Specifically, differential pressure transmitters typically consist of two pressure interfaces and a measuring chamber. When the medium enters the measurement chamber, it will affect the pressure inside the measurement chamber, causing a change in the pressure inside the measurement chamber. The differential pressure transmitter calculates the differential pressure between two pressure points by measuring the pressure difference inside the measurement chamber, and converts it into a standard signal (such as a 4-20mA DC current signal) for output.

2、 Type

HANYOC-4751 pressure transmitterAccording to their measurement principles and application scenarios, they can be classified into various types. For example, according to different measurement methods, it can be divided into static pressure differential pressure transmitters and dynamic pressure differential pressure transmitters. Static pressure differential pressure transmitter calculates differential pressure by measuring the static pressure difference between two pressure points, and is suitable for measuring low-speed fluids; The dynamic pressure differential pressure transmitter calculates the differential pressure by measuring the dynamic pressure difference generated by the fluid in the pipeline, and is suitable for measuring high-speed fluids.

3、 Application scenarios

Differential pressure transmitters have a wide range of application scenarios in the fields of industrial automation and control. Here are some typical applications:

1. Liquid level measurement: Differential pressure transmitters are often used to measure the liquid level in storage tanks, tanks, containers, etc. By measuring the pressure difference between the bottom and top of the liquid, the liquid level height can be indirectly calculated. This method is particularly suitable for liquid level measurement of high temperature, high pressure, corrosive or viscous liquids.

2. Flow measurement: In many fluid systems, differential pressure transmitters are used in conjunction with throttling devices (such as orifice plates, Venturi tubes, etc.) to calculate flow by measuring the pressure difference before and after the fluid passes through the throttling device. This method is called differential pressure flow measurement and is widely used for flow measurement of gases, vapors, and liquids.

3. Pressure measurement: Although differential pressure transmitters are mainly used to measure pressure differences, in some cases, they can also be used to directly measure the pressure of a single medium. By setting the pressure on one side as a reference pressure (such as atmospheric pressure or a fixed pressure point within the system), a differential pressure transmitter can measure the pressure value on the other side.

4. Monitoring of filtration system: In the filtration system, differential pressure transmitters can be installed before and after the filter to determine whether the filter is clogged by monitoring the pressure difference before and after the filter. When the pressure difference exceeds the set value, the system can issue an alarm or automatically clean or replace the filter.

5. Combustion system control: In the combustion system, differential pressure transmitters can be used to measure the pressure difference in the combustion chamber or flue to control the supply of fuel and the mixing ratio of air, thereby optimizing combustion efficiency and reducing pollutant emissions.

4、 Selection and Installation

When choosing a differential pressure transmitter, factors such as the properties of the measured medium, working pressure, working temperature, measurement accuracy, and environmental conditions need to be considered. At the same time, when installing differential pressure transmitters, the following points should also be noted:

1. Installation position: The installation position of the differential pressure transmitter should be easy to observe and operate, and avoid direct contact with corrosive or overheated measured media. At the same time, it should be ensured that the liquid column pressure head inside the pressure tube remains balanced to improve measurement accuracy.

2. Wiring and debugging: When wiring, ensure the correct connection of power and signal lines, and use shielded twisted pair cables to reduce interference. During debugging, zero point adjustment and range adjustment should be carried out according to the instructions in the operation manual.

3. Daily maintenance: Regularly inspect and maintain the differential pressure transmitter, including cleaning the measuring chamber and checking if the pressure pipe is blocked. At the same time, it should be ensured that the working environment temperature and humidity of the differential pressure transmitter are within the allowable range to extend its service life.