Commonly used output signal selections for pressure transmitters
INDUSTRIAL LCD DISPLAYS / IGBT MODULES DISTRIBUTOR

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

Commonly used output signal selections for pressure transmitters

Posted Date: 2024-01-31

Commonly used output signal selections for pressure transmitters

Pressure transmitter is a commonly used sensor in industrial automation process control. It is used to measure the pressure of fluid, gas or liquid and convert the pressure value into an electrical signal output. In practical applications, the selection of the output signal of the pressure transmitter is very important, which directly affects the reliability and accuracy of the control system. The commonly used output signal selections of pressure transmitters will be introduced in detail below.

First of all, the common output signals of pressure transmitters are in two forms: analog signals and digital signals. Analog signals generally use 4-20mA or 0-10V, while digital signals often use communication protocols such as RS485 and MODBUS. The choice of output signal needs to be determined based on the specific application needs and control system requirements.

For analog signal output methods, 4-20mA is a more common form. Compared with 0-10V, 4-20mA signals have stronger anti-interference ability when the transmission distance is longer, and are suitable for monitoring and control systems in complex industrial field environments. The advantage of the 0-10V signal is that its electrical interface is simple and easy to connect with other devices. Therefore, when selecting analog signal output, you need to make an appropriate choice based on the actual application environment and the connection method with other devices.

For digital signal output methods, RS485 is a commonly used communication protocol with the advantages of fast transmission rate and high data reliability. Through the RS485 protocol, multiple pressure transmitters can be connected into a network to achieve multi-point collection and centralized management. In addition, MODBUS is a commonly used serial communication protocol that can be widely used in industrial automation control systems. When selecting digital signal output, you need to consider the compatibility of the control system's communication interface and communication protocol, and ensure that the transmitted data is accurate and reliable.

When actually selecting the output signal of the pressure transmitter, the following aspects need to be considered:

1. Measuring range: Select the output signal according to the pressure range of the measured fluid, gas or liquid. Generally speaking, the 4-20mA signal is suitable for a larger measuring range, while the 0-10V signal is suitable for a smaller measuring range.

2. Accuracy requirements: Select the output signal according to the control system’s requirements for measurement accuracy. Generally speaking, the measurement accuracy of 4-20mA signals is higher and can meet precise control requirements.

3. Environmental requirements: Select the output signal according to the requirements of the actual application environment. For example, in an industrial site environment, due to the presence of strong electromagnetic interference, 4-20mA signals are generally selected to improve anti-interference capabilities.

4. Device connection: Select the output signal according to the connection method with other devices. When connecting to a PLC or DCS system, digital signal output is usually selected.

5. Cost factors: Select the corresponding output signal according to the actual situation. Generally speaking, digital signal output is more complex than analog signal output, and the cost is relatively high. Therefore, under the premise of cost control, the above factors need to be comprehensively considered to make a choice.

To sum up, the output signal selection of the pressure transmitter is determined according to the specific application needs and the requirements of the control system. When selecting an output signal, multiple factors such as measurement range, accuracy requirements, environmental requirements, equipment connections, and cost factors need to be considered, and a suitable choice must be made with comprehensive consideration. By correctly selecting the output signal, the reliability and accuracy of the control system can be improved to meet the needs of industrial automation process control.


#Commonly #output #signal #selections #pressure #transmitters