Скачать или смотреть What is loop-powered device?

A loop-powered device, often referred to as a loop-powered instrument or transmitter, is a type of electronic device that operates using electrical power derived from a current loop. In industrial process control and automation, loop-powered devices are commonly used to measure and transmit signals related to various parameters such as temperature, pressure, flow, or other process variables.

The basic principle behind loop-powered devices involves using a 4-20 mA (milliampere) current loop for both power and signal transmission. Here's how it typically works:

1. *Power Supply:* The device receives its electrical power from the current loop. The power supply is often provided by a current source located in the control system.

2. *Signal Transmission:* The device modulates the current within the range of 4 to 20 mA to represent the measured parameter. For example, a 4 mA signal might correspond to the lowest value of the measured variable, while a 20 mA signal represents the highest value.

3. *Communication:* The control system interprets the current signal and takes appropriate actions based on the measured parameter.

Loop-powered devices have several advantages in industrial settings:

*Simplicity:* Using a single pair of wires for both power and signal reduces the complexity of wiring.

*Long Cable Runs:* The current loop design allows for long cable runs without significant signal degradation.

*Intrinsically Safe:* The low voltage and current levels make loop-powered devices suitable for hazardous environments, as they are often intrinsically safe.

*Compatibility:* Many control systems and instruments support the 4-20 mA standard, providing compatibility between devices from different manufacturers.

It's important to note that loop-powered devices are just one approach to instrumenting and controlling industrial processes. Other technologies, such as digital communication protocols (e.g., HART, Foundation Fieldbus, Profibus), are also used in modern industrial automation.

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