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What Is The Output Of Pressure Transmitter?
Jan 28, 2019

What is the output of pressure transmitter?

What is the output of pressure transmitter?The pressure transmitter can output current or voltage. The current pressure transmitter has been able to convert the analog voltage signal whose pressure sensor output is mV level into the voltage signal of the transmitter output 0-10V or 4-20mA current signal.

Why is the pressure transmitter output signal 4-20mA?

The 4-20 mA and 1-5 V signal formats output by the pressure transmitter are specified by national standards that are in line with international standards.

In the signal loop, the pressure transmitter is equivalent to a variable resistor connected in series with the power supply, ammeter (indicator), and load resistor (including wire resistance).

The function of the pressure transmitter circuit is to change the current in the circuit to a range of 4-20 mA by changing its own resistance as required.

The pressure acts on the sensitive component, and the sensitive component is deformed. The deformation causes the resistance or capacitance value to change, and then is converted into an analog 4-20 mA output through the conversion circuit.

If there is a 250 ohm resistor in the load, the voltage on it is exactly 1-5V output.


Conversion relationship between 4-20mA and transmitter output

1. Know the actual value of the transmitter output and the set user range, such as pressure, temperature, flow or liquid level, and find its milliampere value as follows:

What is the output of pressure transmitter?


2. Use the multimeter to measure the milliampere value of the transmitter, and know the set user range, and find the actual value of the output, such as pressure, temperature, flow or liquid level, as follows:

Transmitting output =

4-20mA


The 3051 pressure transmitter is used in a wide range of industries including chemical, power, water treatment and oil gas. The instrument can also be adapted and used in harsh environments. Because there are many chemicals in the chemical industry, such as stupid, selenium and other substances in the pipeline process, the accuracy of transport is very high, too much or a small amount of chemical cost tolerance has a great impact on the final product quality. The 3051 pressure transmitter maintains precision control in practical applications, typically at 0.02% and higher.


When selecting the instrument, the user will consider many factors, including many basic parameter data of the 3051 pressure transmitter, to determine whether it can be integrated with the working conditions, and is very good to use. Among the many factors, accuracy is relatively important, but users should also consider other factors, such as the output signal, which is also crucial for the use of the instrument.


The most commonly used on the market today are the HART protocol 4-20MA transmitters, as well as some fieldbus protocols and the Bulang protocol 4-20MA. There are many kinds of output signals of 3051 pressure transmitter, such as 4~20MA, 0-20MA, 0-10V or 0~5V, etc. Each output signal has its own characteristics. If users want to implement a fully digital process control system, FF fieldbus is the best choice if cost factors are not considered.


When selecting the output signal, the user should be clear that the best is not the most suitable, the most extensive is not necessarily the best. In the new automated process control system, the most widely recommended HART protocol 4-20MA is recommended, which is highly compatible with other brands or models of transmitters, even if it is to replace the product. If the user has used the 3051 pressure transmitter before, the original protocol can be used without field changes, without affecting the actual use.