Glass Electrode for pH Monitoring Probes | Component Specifications

Product Specifications

Technical details and manufacturing context for Glass Electrode

Definition

The glass electrode is the critical sensing element of a pH monitoring probe, consisting of a thin glass membrane that selectively responds to hydrogen ions. It forms part of an electrochemical cell where the potential difference across the glass membrane correlates directly with the pH of the solution being measured. This component is used in computer, electronic, and optical product manufacturing, typically as a replaceable part in pH meters and analyzers. The electrode's construction includes a special pH-sensitive glass membrane, a silver/silver chloride reference element, an internal buffer solution, and an epoxy or plastic housing. Key parameters include a measurement range of 0–14 pH, an operating temperature of 0–80°C (with higher temperatures shortening lifespan), an operating pressure of 0–0.6 MPa, a response time of ≤30 seconds at 25°C, a zero point of 7.0 ±0.2 pH at 25°C in pH 7 buffer, a slope of ≥95% of theoretical at 25°C, a resistance of 50–500 MΩ at 25°C, an insulation resistance of ≥100 MΩ between electrode and cable at 25°C, a glass membrane thickness of 0.1–0.2 mm, a cable length of 1–5 meters (custom lengths available), a connector type of BNC (other connectors on request), and a weight of 50–100 g without cable. These values are directory reference ranges and must be confirmed for the specific model and application. The electrode operates based on ion exchange at the glass membrane surface, where hydrogen ions interact with the hydrated glass layer, creating a potential difference between the internal reference solution and the external test solution. This potential is measured against a reference electrode to determine pH. For selection, consider the required measurement range, temperature and pressure conditions, response time, and connector compatibility. Verification questions include checking the zero point and slope in standard buffers, measuring resistance and insulation resistance, and ensuring the membrane is free from cracks or contamination. Maintenance signals include slow response, drift, or erratic readings, which may indicate membrane fouling or aging. Failure boundaries include operation beyond specified temperature or pressure limits, which can damage the membrane, and exposure to incompatible chemicals. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The glass electrode operates based on ion exchange at the glass membrane surface. Hydrogen ions in the solution interact with the hydrated glass layer, creating a potential difference between the internal reference solution and the external test solution. This potential is measured against a reference electrode to determine pH. The glass membrane is selectively sensitive to hydrogen ions, and the potential difference follows the Nernst equation, allowing accurate pH measurement across the 0–14 range. The response time is typically ≤30 seconds at 25°C, and the electrode's performance is characterized by its zero point and slope, which should be verified periodically.

Common Materials

Special pH-sensitive glass, Silver/silver chloride reference element, Internal buffer solution, Epoxy or plastic housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Measurement Range	0–14 pH	Full pH scale
Operating Temperature	0–80 °C	Above 80°C shortens lifespan
Operating Pressure	0–0.6 MPa	Higher pressure may damage membrane
Response Time	≤30 s	At 25°C, 95% of final value
Zero Point	7.0 ±0.2 pH	At 25°C in pH 7 buffer
Slope	≥95 %	Theoretical slope at 25°C
Resistance	50–500 MΩ	At 25°C
Insulation Resistance	≥100 MΩ	Between electrode and cable at 25°C
Glass Membrane Thickness	0.1–0.2 mm	Thinner for faster response
Cable Length	1–5 m	Custom lengths available
Connector Type	BNC	Other connectors on request
Weight	50–100 g	Without cable

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

Components / BOM

Glass Membrane Part
pH-sensitive element that selectively responds to hydrogen ions

Material: Special pH-sensitive glass
Internal Reference Electrode Part
Provides stable reference potential within the electrode

Material: Silver/silver chloride
Internal Buffer Solution Part
Maintains constant pH inside the electrode

Material: pH buffer solution
Electrode Body Part
Protective housing and structural support

Material: Epoxy, plastic, or glass
Reference Junction Part
Allows electrical contact between reference electrode and test solution

Material: Ceramic, wood, or porous polymer

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	0 to 6 bar (standard), up to 16 bar with reinforced construction
other spec:	pH range: 0-14, slurry concentration: <25% solids by weight, flow rate: <2 m/s to prevent abrasion
temperature:	0°C to 80°C (standard), up to 130°C with high-temperature glass

Media Compatibility

✓ Aqueous solutions ✓ Food/beverage processing streams ✓ Pharmaceutical process fluids

Unsuitable: Hydrofluoric acid or highly alkaline solutions (pH >12) at elevated temperatures

Sizing Data Required

Process temperature range
Required pH measurement accuracy (±0.01 to ±0.1 pH)
Process connection type and immersion length

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Glass membrane cracking

Cause: Mechanical stress from impact, thermal shock due to rapid temperature changes, or improper handling during installation/cleaning

Reference junction contamination

Cause: Clogging or poisoning of the porous junction by process media, solids buildup, or chemical reactions that block ionic conductivity

Maintenance Indicators

Erratic or drifting pH readings despite calibration
Visible cracks, chips, or cloudiness in the glass bulb

Engineering Tips

Implement controlled temperature transitions and use protective sleeves/shields to prevent thermal/mechanical shock
Establish regular cleaning protocols using appropriate solutions and perform routine calibration checks to detect early degradation

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

ISO 17025:2017 - General requirements for the competence of testing and calibration laboratories ASTM E70-19 - Standard Test Method for pH of Aqueous Solutions with the Glass Electrode IEC 60746-2:2003 - Expression of performance of electrochemical analyzers - Part 2: pH value

Quoted from the published standard.

Manufacturing Precision

pH Accuracy: +/-0.02 pH units
Response Time: 95% of final reading within 30 seconds

Quality Inspection

Electrode Slope Test - Verification of Nernstian response (typically 95-102% of theoretical slope)
Asymmetry Potential Test - Measurement of potential difference between identical buffer solutions

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Glass Electrode

Manufacturer profiles associated with Glass Electrode.

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Frequently Asked Questions

What is the measurement range of this glass electrode?

The directory reference range is 0–14 pH. However, the actual usable range may depend on the specific model and application. Always confirm with the manufacturer.

What is the maximum operating temperature?

The reference operating temperature range is 0–80°C. Operating above 80°C can shorten the lifespan of the electrode. Verify the exact limit for your model.

How often should the electrode be calibrated?

Calibration frequency depends on usage and application. Typically, it is recommended to calibrate before each use or at regular intervals using standard buffer solutions. Check the manufacturer's guidelines.

What does the response time indicate?

The response time is the time required for the electrode to reach 95% of its final reading. The reference value is ≤30 seconds at 25°C. A longer response time may indicate fouling or aging.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

pH Monitoring Probe

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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