What are the disadvantages of using a sensor with a 4 to 20 mA output?

These sensors consume a lot of power compared with other sensors. A sensor with a 4 to 20 mA output will consume at a minimum 4 mA, and as much as 20 mA at full scale. This must be accounted for in a system’s power budget. To conserve power, consider using the SW12V port on the data logger to turn the sensor off between measurements.

In addition, Campbell Scientific data loggers cannot measure a 4 to 20 mA signal directly and require the use of a 100 ohm precision resistor, such as a CURS100, to measure the sensor.

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