Reference Junction: pH Range 0-14, Pore Size 0.1-10 μm

Component Specifications

Definition

A critical component in glass electrode pH sensors that maintains a stable reference potential by allowing ionic contact between the internal reference solution and the sample solution through a porous junction, enabling accurate pH measurement in various industrial applications.

Working Principle

The reference junction creates a stable electrochemical potential by allowing controlled diffusion of ions between the internal reference electrolyte and the sample solution through a porous ceramic, glass, or polymer membrane, completing the electrical circuit for pH measurement while minimizing contamination and potential drift.

Materials

Typically made from porous ceramics (alumina), glass frits, or specialized polymers (PTFE, polyethylene) with controlled pore sizes (0.1-10 μm) to regulate ion flow and prevent clogging.

Technical Parameters

Parameter	Typical range	Notes & selection driver
PH Range	0-14
Flow Rate	0.1-1.0 μL/hour
Pore Size	0.1-10 μm
Junction Type	Ceramic, Glass Frit, Polymer
Pressure Rating	0-10 bar
Temperature Range	-5°C to 130°C
Electrical Resistance	1-10 kΩ

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, ASTM E70

Parent Products

This component is used in the following industrial products

Glass Electrode

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

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Engineering Analysis

Risks & Mitigation

Junction clogging from suspended solids
Chemical contamination of reference electrolyte
Potential drift due to junction aging
Mechanical damage during installation/cleaning
Temperature-induced measurement errors

FMEA Triads

Trigger: Suspended solids or precipitates in sample solution
Failure: Clogged junction leading to unstable readings and slow response
Mitigation: Regular cleaning with appropriate solutions, use of protective sleeves, installation of pre-filters

Trigger: Chemical attack from aggressive media
Failure: Degradation of junction material and contamination of reference electrolyte
Mitigation: Selection of chemically resistant junction materials, use of protective barriers, regular inspection

Trigger: Improper storage or handling
Failure: Dehydration of internal electrolyte and junction damage
Mitigation: Proper storage in storage solution, careful handling procedures, staff training

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.02 pH units for standard applications, ±0.01 pH units for precision measurements

Test Method

ISO 10523 for pH measurement, ASTM E70 for electrode testing, manufacturer calibration procedures

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 Reference Junction

Manufacturer profiles associated with Reference Junction.

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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

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Frequently Asked Questions

What is the purpose of the reference junction in a glass electrode?

The reference junction provides a stable electrical reference potential by allowing ionic contact between the internal reference solution and the sample, completing the electrochemical circuit for accurate pH measurement.

How often should reference junctions be maintained or replaced?

Reference junctions typically require cleaning every 1-3 months and replacement every 6-12 months depending on application conditions, sample composition, and measurement frequency.

What causes reference junction failure?

Common failures include clogging from suspended solids, chemical attack from aggressive samples, dehydration of the internal electrolyte, and mechanical damage from improper handling.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Reference Junction