What is a loop powered indicator?
Loop powered indicators were designed for field (outdoor) use and have operating characteristics similar to two-wire transmitters. Like two-wire transmitters, they use a 4-20mA signal for power. Therefore, they are very low power devices which are ideal for hazardous environments as well. They typically use a liquid crystal display (LCD) for indication and are very easy to use since they can easily be included in a 4-20mA loop, requiring only a few volts (1 to 4V) of loop drive.
