Analog Signal Calculator

4-20mA analog signals are a widely used method of transmitting information in industrial settings. They work by sending a current of between 4 and 20 milliamps through a circuit, with the magnitude of the current indicating the value being transmitted.

Calculator

Details

4-20mA analog signals are known for their simplicity, reliability, and resistance to interference. Because 4mA is the minimum value that can be transmitted, it's easy to tell if the signal has failed, making troubleshooting straightforward. Additionally, this type of signal can be transmitted over long distances with minimal loss of accuracy.

Use linear interpolation to convert 4-20mA signals to process values

Linear interpolation

y=y1+x−x1x2−x1∗(y2−y1)y = y_{1} + \frac{x - x_1}{x_2 - x_1} * \left( y_2 - y_1 \right)
y=lrl+x−4mA20mA−4mA∗(url−lrl)y = lrl + \frac{x - 4mA}{20mA - 4mA} * \left(url - lrl \right)
x=x =
4-20mA signal
y=y =
Transmitter process value
url=url =
Transmitter upper range limit
lrl=lrl =
Transmitter lower range limit