Use PWM technology to build high-performance flow transmitter

“In the process of measuring the factory environment, the sensor will control the status of the entire system through a programmable logic controller (PLC). Typical measurements include temperature, pressure, flow, and liquid level. Different technologies can be adopted when designing a flow transmitter, but here we will first understand the PWM technology. Can the PWM technology discussed below be used to achieve functions such as rapid stabilization time and low energy consumption?

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In the process of measuring the factory environment, the sensor will control the status of the entire system through a programmable logic controller (PLC). Typical measurements include temperature, pressure, flow, and liquid level. Different technologies can be adopted when designing a flow transmitter, but here we will first understand the PWM technology. Can the PWM technology discussed below be used to achieve functions such as rapid stabilization time and low energy consumption?

Loop-powered, 4 to 20 mA output field transmitters are actually the industry standard for process automation. For various reasons, field transmitters use PWM to 4-20mA Circuits, including:

・ Simplicity

・ Robustness

・ Cost optimization

As new applications require loop transmitters with higher resolution, lower noise, and lower power consumption, this makes the PWM method a challenge.

Download this technical note to learn about the implementation method and test results of the PWM to 4-20mA loop supported by HART.

Implementation method and test results of PWM to 4~20mA loop supported by HART.pdf