4-20 mA Current to Voltage Converter
Precision resistors are often used in 4 to 20mA current loop circuits for sensing and control applications. The 4 to 20mA current loop is a common standard used in industrial instrumentation and control systems, where the current value represents the process variable being measured or controlled.
In a 4 to 20mA current loop:
● 4mA represents the minimum value or the “zero” point of the process variable.
● 20mA represents the maximum value or the “span” of the process variable.
● Any value between 4mA and 20mA corresponds to the range of the process variable being measured or controlled.
Precision resistors play a crucial role in this current conversion process. These resistors are carefully manufactured to have a very accurate and stable resistance value. The resistors are typically used in the following ways:
● Current Sensing Resistor (Shunt Resistor)
● Current Limiting Resistor
●Reference Resistor
When selecting precision resistors for 4 to 20mA current conversion, the following factors are important:
● Resistance Tolerance
● Temperature Coefficient
●Power Rating
●Long-Term Stability
●Environmental Considerations
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