Glass membrane: pH Range 0-14, Temperature Range -5°C to 100°C

Q: Why does the glass membrane need regular calibration?

Glass membranes experience gradual aging and contamination that affect their electrochemical response. Regular calibration against standard buffer solutions compensates for drift and maintains measurement accuracy.

Q: What causes glass membrane failure?

Common failure causes include mechanical damage (cracks), chemical attack from HF or strong alkalis, dehydration from dry storage, and coating by proteins or oils that block ion exchange.

Q: How should glass membranes be stored?

Store in pH 4 or 7 buffer solution or specialized storage solution to maintain hydration. Never store in distilled water or allow to dry out, as this damages the hydrated gel layer.

Component Specifications

Definition

A glass membrane is the critical sensing element in a pH electrode, consisting of a thin, ion-sensitive glass bulb that develops a potential difference when exposed to aqueous solutions. This potential correlates directly to hydrogen ion activity, following the Nernst equation, allowing accurate pH measurement across various industrial applications.

Working Principle

Operates on the ion-exchange principle where hydrogen ions from the solution interact with hydrated gel layers on the glass surface, creating a membrane potential proportional to pH. This potential is measured against a stable reference electrode to determine pH value.

Materials

Lithium silicate-based glass with specific metal oxide additives (typically Li₂O, CaO, BaO) to optimize ion selectivity, electrical conductivity, and chemical durability. Composition varies for different pH ranges and temperature stability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Slope	59.16 mV/pH at 25°C
PH Range	0-14
Zero Point	pH 7.0 ± 0.2
Response Time	<30 seconds to 95%
Temperature Range	-5°C to 100°C
Membrane Thickness	0.1-0.5 mm
Internal Resistance	50-1000 MΩ

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10523, DIN 19266

Parent Products

This component is used in the following industrial products

pH Electrode

Electrochemical sensor component that measures hydrogen ion concentration in aqueous solutions by generating a voltage proportional to pH.

View Product Details

Glass Electrode

A specialized sensor component within a pH monitoring probe that generates an electrical potential proportional to hydrogen ion concentration.

View Product Details

Engineering Analysis

Risks & Mitigation

Chemical degradation in extreme pH solutions
Mechanical fracture from impact
Reference electrode contamination
Temperature coefficient errors
Fouling from process media

FMEA Triads

Trigger: Exposure to hydrofluoric acid or strong alkaline solutions
Failure: Complete dissolution or etching of glass surface
Mitigation: Use specialty glass formulations for harsh chemicals; implement pre-treatment systems

Trigger: Thermal shock from rapid temperature changes
Failure: Cracking or micro-fractures in glass bulb
Mitigation: Implement gradual temperature transitions; use temperature-compensated electrodes

Trigger: Protein or oil coating on membrane surface
Failure: Reduced response time and measurement drift
Mitigation: Regular cleaning with enzymatic or detergent solutions; use protective sleeves

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 pH for laboratory grade, ±0.1 pH for industrial grade

Test Method

Two-point calibration against NIST-traceable pH buffers at 25°C; slope and offset verification per manufacturer specifications

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Glass membrane

Manufacturer profiles associated with Glass membrane.

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Frequently Asked Questions

Why does the glass membrane need regular calibration?