What is the typical range of a current sensor output?

The typical range of a current sensor output is 4 to 20 mA. This range is widely used in industrial applications for several reasons. First, the 4 to 20 mA signal allows for the ability to detect a zero-point failure. In this context, a signal of 0 mA would indicate a problem, as it falls outside the standard operating range. By starting at 4 mA, the system can ensure that any output below this level is recognized as an issue.

Additionally, the 4 to 20 mA standard provides a good balance between resolution and distance. Current signals are less susceptible to voltage drops over long distances compared to voltage signals, making them preferable for transmitting data in large facilities. This is important in environments with extensive wiring, ensuring that the signal remains accurate despite potential losses.

Overall, the 4 to 20 mA range is favored in many instrumentation and control systems due to its reliability, ease of interpretation, and compatibility with a wide variety of hardware.