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.2-Channel Analog Input (Current 4 to 20mA)
A 2-channel analog input system designed for 4-20mA current loops is used to measure and record the analog signals from two different sensors or devices that output current in the range of 4 mA to 20 mA.
4-20mA Current Loop: This is a standard industrial current loop used to transmit analog signals over long distances with minimal signal degradation. The 4-20mA range is widely used in process control systems and instrumentation.
Signal Range: The current loop works within the range of 4 mA to 20 mA, where:
4 mA represents the lowest value of the measured parameter (often the minimum).
20 mA represents the highest value (often the maximum).
Working Principle: The device receiving the signal (e.g., a controller, PLC, or data acquisition system) converts the received current into a corresponding value (e.g., temperature, pressure, or flow rate) using predefined calibration values.
Advantages:
Noise Resistance: The current signal is less prone to electrical noise, making it suitable for industrial environments with electrical interference.
Long-distance Transmission: Current signals can be transmitted over long distances (up to several kilometers) without significant signal degradation.
Applications: Commonly used in industrial process monitoring, automation, control systems, and measurement instruments (e.g., pressure, flow, and temperature sensors).
In a 2-channel setup, two independent 4-20mA signals are processed, allowing for the monitoring and control of two parameters simultaneously.
