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PV to mA Conversion Formula:
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The PV to mA conversion is a standard industrial process that converts a process value (such as pressure, temperature, or flow) into a corresponding 4-20 mA signal. This conversion is widely used in process control and instrumentation systems.
The calculator uses the conversion formula:
Where:
Explanation: The formula linearly scales the process value between the 4-20 mA range, where 4 mA typically represents the minimum process value and 20 mA represents the maximum process value.
Details: This conversion is essential in industrial automation and control systems where analog signals (4-20 mA) are used to transmit process data over long distances with minimal signal degradation and interference.
Tips: Enter the current process value, the minimum value of your process range, and the maximum value of your process range. Ensure that Max ≠ Min to avoid division by zero errors.
Q1: Why is the 4-20 mA range used instead of 0-20 mA?
A: The 4 mA "live zero" allows distinguishing between a true zero signal and a broken wire or failed instrument (which would show 0 mA).
Q2: What types of process values can be converted?
A: Any linear process parameter including temperature, pressure, level, flow, pH, and other process variables can be converted using this formula.
Q3: How accurate is this conversion?
A: The conversion is mathematically precise. Accuracy depends on the calibration and linearity of the actual instrumentation.
Q4: Can this be used for non-linear processes?
A: This formula assumes linear scaling. For non-linear processes, additional characterization or lookup tables may be required.
Q5: What if my process range includes negative values?
A: The formula works with negative values as long as the process range is properly defined (Min and Max values correctly specified).