Check the orifice plate sizing in Chapter 5. The manual explains that if the differential pressure input exceeds the configured orifice range by 10%, the calculation engine returns NaN to prevent overflow.
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The is an automatic microcomputer controller designed specifically for managing small-to-medium single-stage reverse osmosis (RO) water treatment systems. It automates the entire filtration process by monitoring system inputs and controlling output devices like pumps and valves. Key Technical Specifications RO program controller ROC-2015 - chiwatec Check the orifice plate sizing in Chapter 5