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

Applied To / Applications

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

pH Monitoring Probe

View system integration details

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.

Data Basis

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

Preliminary Technical Classification

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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

Glass Electrode

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