Membrane Sensitivity
Analytical instruments utilizing a thin ion-sensitive membrane measure the hydrogen ion activity in aqueous solutions. The glass ph electrode functions by developing a potential across a specialized silica bulb when it comes into contact with an acidic or alkaline liquid. This instrument is the standard for monitoring dye liquor acidity and wastewater treatment in garment factories.
Internal Sensitivity
Hydration of the gel layer on the outer surface of the glass is required for proper operation. When a glass ph electrode is dry, it cannot exchange ions effectively, resulting in slow response times or erratic millivolt signals. For this reason, the probe is stored in a dedicated solution to maintain the moisture of the glass lattice.
Calibration Protocol
Accuracy requires frequent comparison against known buffer solutions to account for the gradual depletion of the internal reference. Over time, the glass ph electrode undergoes a change in its slope and offset due to chemical attack from the process fluids. This calibration step ensures that the readings used to adjust chemical dosing in the mill remain within the narrow tolerances required for consistent fabric colouration and repeatable batch results.
Thermal Limit
Extreme temperatures or very high pH levels can dissolve the glass surface over several months. Most electrodes are rated for specific ranges to prevent premature failure.
