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ORP to PPM Equation:
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The ORP to PPM formula converts Oxidation-Reduction Potential (ORP) measurements in millivolts (mV) to parts per million (PPM) concentration using an exponential relationship with a calibration factor.
The calculator uses the ORP to PPM equation:
Where:
Explanation: The equation approximates PPM concentration from ORP measurements using an exponential relationship with a baseline offset of 700 mV and a scaling factor of 25.
Details: This conversion is particularly useful in water treatment, swimming pool maintenance, and industrial processes where ORP measurements need to be translated into concentration units for easier interpretation and dosing calculations.
Tips: Enter ORP value in millivolts (mV) and the appropriate calibration factor for your specific application. The calibration factor may vary based on the specific chemical being measured and the measurement conditions.
Q1: Why is there a 700 mV offset in the formula?
A: The 700 mV offset represents a baseline ORP value around which the exponential relationship is centered for typical water treatment applications.
Q2: How do I determine the correct calibration factor?
A: The calibration factor should be determined through experimental measurement with known concentration standards specific to your application and measurement system.
Q3: Is this formula applicable to all ORP measurements?
A: This is a simplified approximation that works best for chlorine-based disinfectants in water treatment. Accuracy may vary for other redox systems.
Q4: What are typical ORP ranges for drinking water?
A: For effective disinfection, drinking water typically maintains ORP values between 650-750 mV, though optimal ranges depend on specific treatment goals.
Q5: Why use an exponential relationship for ORP to PPM conversion?
A: ORP measurements follow a logarithmic relationship with concentration according to the Nernst equation, which is approximated by this exponential formula.