pH-sensitive glass bulb is a specialized electrochemical sensor component that detects hydrogen ion concentration in solutions for pH measurement.
A pH-sensitive glass bulb is a precision electrochemical sensing element made from specially formulated glass containing metal oxides (typically lithium, sodium, or calcium oxides). This glass membrane develops a potential difference when exposed to aqueous solutions due to ion exchange between the glass surface and hydrogen ions in the solution. The bulb's electrical potential varies logarithmically with hydrogen ion concentration according to the Nernst equation, enabling accurate pH measurement across industrial applications.
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Degradation occurs due to chemical attack from strong alkaline solutions (pH >12), high temperatures (>80°C), dehydration when stored dry, mechanical abrasion, and poisoning from heavy metal ions or proteins that coat the glass surface.
Industrial applications require calibration every 1-4 weeks depending on usage intensity, solution characteristics, and required accuracy. Continuous monitoring systems should be calibrated at least monthly using standard buffer solutions at pH 4.01, 7.00, and 10.01.
Standard pH glass bulbs are designed for aqueous solutions. Non-aqueous or low-ionic-strength solutions require special glass formulations or alternative measurement techniques due to different ion mobility and junction potential issues.
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