Help! Issue with converting the pH value from a pH meter into PLC program parameters

2009-02-15View Original

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Help! Issue with converting the pH value from a pH meter into parameters in a PLC program. The S7-200 PLC used in the company’s wastewater treatment system requires program modification; the pH meter is used to control the dosing pump for adding chemicals. However, it’s not clear what analog value should be entered into the PLC program when the pH value is 7, nor how this value is calculated. If anyone knows the answer, please help

Reply #22009-02-15

What is used for PH is also the ORP redox potential

Reply #32009-02-15

For an analog value of 4–20 mA corresponding to a pH value of 0–14, the corresponding numerical value is 0–1000; if the pH value of the controlled system is to be maintained at 7, then the target digital value should be set to 500.

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Help! Issue with converting the pH value from a pH meter into PLC program parameters

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