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The electrode must be chosen according to the actual operating conditions: several external factors can alter the measurement. Dirty diaphragm Deposits on the porous diaphragm generate spurious potentials and therefore measurement errors. Depending on the appl …
Also in: The reference electrode · How pH is measured · pH control systems
… characteristics of the water and by the chlorine dosed: the three continuous probes differ in how many of these variables influence the measurement; the DPD method reads a sample under its own conditions. Redox The probe records every variation in potential wi …
Also in: Sodium hypochlorite · Redox: an indirect measurement · Amperometric cells: a direct, continuous measurement · The Redox potential of water and its variations
The reference electrode has a known potential, constant and independent of external conditions: it normally consists of a metal coated with one of its sparingly soluble salts, immersed in a solution containing the anion of the same salt. Silver chloride Ag/AgC …
Also in: The Redox potential in drinking water · Disinfectant measuring principles · The closed amperometric cell · Operation of a disinfection system
… first adjust the pH and only then dose the hypochlorite are preferable. Two probes Two probes, mounted in a flow-through probe holder supplied with a water sample taken after filtration, measure pH and free chlorine and tell the pumps how much corrector and ho …
Also in: Amperometric cells: a direct, continuous measurement · The closed cell in operation · Open cell, closed cell and DPD method: advantages and limitations · With water presence sensor
… closes the drain and signals the alarm, as protection against valve or probe failure. Pre-bleed Bleed-off carried out before biocide dosing, timed or down to a lower conductivity: during dosing and the subsequent lock-out, in fact, the drain remains blocked. L …
Also in: Verifying treatment effectiveness · Cycles of concentration · The 2015 Legionellosis Guidelines for cooling towers
… sections trap air bubbles, which the pump cannot remove. Tank without level probe When the chemical runs out, the pump continues to run, drawing in air, and must be primed again. Pump without foot filter The foot filter incorporates a non-return system that pr …
Also in: Correct installation · Why the pump does not dose
Drinking water Regulating pH pH electrode Measurement problems Insight → Drinking water Well water Analysis and disinfection Chlorine measurement Systems Insight → Swimming pools Private swimming pools pH and disinfectants Redox, cells and DPD Insight → Swimmi …
… proportional to a 4/20 mA signal or to the Redox potential measured by an electrode.
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