MV to 4-20mA Converter

About This Tool

This tool provides a precise, domain-focused calculation to translate a sensor voltage in millivolts (mv) into a corresponding current in a 4-20 mA loop. It targets control engineers, instrumentation technicians, and automation integrators who connect voltage-output sensors to loop-powered I/O modules. The mapping is essential for reliable signal transmission across controllers, PLCs, and remote devices, minimizing calibration steps and reducing wiring errors.
Conceptually, the tool applies a linear transfer: I = min_current_mA + (mv_value / full_scale_mv) * (max_current_mA - min_current_mA). Required inputs define mv range and current span; optional inputs allow customized bounds. The calculation clamps the result to the configured min and max to handle sensor saturation or out-of-range readings.
By using a single, deterministic formula, it supports quick design validation, troubleshooting, and documentation. It benefits engineering teams during sensor selection, loop calibration, and system integration where consistent 4-20 mA outputs are needed. Unique value includes explicit handling of edge cases, explicit defaults, and clear outputs suitable for verification and audit trails.
Core features include: explicit required inputs, default current bounds (4–20 mA), two-value mapping, error handling, and formatting of current_mA with two decimals. Typical use cases: sensor-to-PLC wiring, replacement of legacy analog instruments, and quick feasibility checks during control-loop design.

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