Power - Feed Water Heater
This component is also called the pre-heater or economiser, but it is actually a heat exchanger that further heats up the water. Monitoring pH and conductivity is very important in this part of the process to control the dosing of the chemicals and to quickly detect any leak in the heat exchanger.
pH measurement
The acidity of pure water is a basic parameter for its quality. Due to the extremely low conductivity, a pH measurement is not clear. It is therefore important to choose an electrode with suitable specifications for this type of water. An intelligent and therefore digital sensor helps to increase the quality and reliability.
pH calculation
The pH value of pure water in the steam cycle can be calculated under certain conditions by combining two conductivity measurements: one before and one after the ion exchanger. Combined with a classical conductivity, this gives an increased certainty and one measurement monitors the other.
ORP (redox) measurement
The measurement of the redox potential (ORP) is often mentioned in the same breath as pH measurement. A potential difference is measured against a reference electrode in both measurements and the same measuring converter is used. Today, you can measure pH, ORP and temperature with the same sensor. The ORP measurement is used to control the dosage of anti-microbial products.
Conductivity
Measuring the (specific) conductivity is the simplest and most commonly used inline measurement for checking the quality of pure water. Intelligent sensors use digital signal transmission, which makes them much more accurate than their traditional analogue predecessors.
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