Alkaline Ph Measurement Errors in Reactive Dye Bath Operations
Uncorrected sodium ion interference and junction drift in high-alkaline reactive dye baths distort pH readings by up to 0.6 units, causing dye hydrolysis and batch off-shade failures.
Nernstian Slope Degradation
Sensor Wear
Industrial electrode performance during high-temperature dyeing fluctuates as sensors are exposed to harsh reagents. The occurrence of nernstian slope degradation reduces the millivolt response of the electrode per unit change in pH. This change results in less accurate measurement of alkali additions.
Regular sensor checks are necessary to maintain dye bath control. The degradation becomes apparent when the sensor is calibrated against known standard solutions.
Chemical Fouling
High concentrations of reactive dyes and sodium salts coat the glass membrane of the probe. This buildup prevents the free exchange of hydrogen ions, which leads to nernstian slope degradation and slow response times. Cleaning the probe with dilute acid can restore some lost performance.
Dyehouse Impact
Reactive dyeing of cotton requires precise dosing of soda ash to trigger covalent bonding between dye and fiber. When the sensor suffers from slope degradation, the automated dosing system may add too much or too little alkali. This mistake results in uneven dyeing or fabric strength loss.
Sensor Replacement
Software in the pH transmitter monitors the calculated slope during each two-point calibration. When the slope falls below fifty-four millivolts per pH unit, the electrode must be replaced. Installing a new probe ensures that dye bath alkalinity remains within the specified tolerances.