Industry-Verified Manufacturing Data (2026)

Junction

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Junction used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Junction is characterized by the integration of Porous ceramic disc and PTFE sleeve. In industrial production environments, manufacturers listed on CNFX commonly emphasize Porous ceramic construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The electrical connection point within a pH sensor where the reference electrode and measurement electrode meet.

Product Specifications

Technical details and manufacturing context for Junction

Definition
In pH monitoring sensors, the junction is a critical component that serves as the electrical connection between the reference electrode and the measurement electrode. It allows ionic contact between the internal reference solution and the sample solution being measured, completing the electrochemical circuit necessary for accurate pH measurement. The junction's design directly affects sensor response time, stability, and measurement accuracy.
Working Principle
The junction creates a liquid-liquid interface that permits ionic conduction while minimizing contamination between the reference electrolyte and sample solution. It maintains electrical continuity by allowing a small, controlled flow of electrolyte through a porous material or ceramic frit, enabling the reference electrode to establish a stable potential relative to the measurement electrode.
Common Materials
Porous ceramic, PTFE (Polytetrafluoroethylene), Glass frit
Technical Parameters
  • Pore size of the junction material, typically ranging from 0.1-10 μm depending on application requirements (μm) Per Request
Components / BOM
  • Porous ceramic disc
    Primary diffusion barrier controlling electrolyte flow
    Material: Ceramic
  • PTFE sleeve
    Secondary barrier and mechanical support
    Material: PTFE
  • O-ring seal
    Prevents leakage between junction and electrode body
    Material: Viton or EPDM rubber
Engineering Reasoning
0.1-1000 mV potential difference across junction
>2.0 μA leakage current at 25°C or >50 mV potential drift over 24 hours
Design Rationale: Electrolyte contamination diffusion exceeding 1×10⁻⁶ cm²/s at the liquid-liquid interface, causing reference potential instability via Nernst equation deviation
Risk Mitigation (FMEA)
Trigger Chloride ion concentration >0.1 mol/L in process fluid
Mode: Silver chloride layer dissolution on reference electrode at >0.222 V vs SHE
Strategy: Double-junction design with 1.0 M potassium nitrate salt bridge maintaining <0.01 S/cm conductivity barrier
Trigger Temperature gradient >5°C/mm across junction interface
Mode: Thermal liquid junction potential exceeding 0.3 mV per °C difference via Soret effect
Strategy: Isothermal housing with 0.1 W/m·K thermal insulation maintaining <0.5°C gradient

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Junction.

Applied To / Applications

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

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0-10 bar (standard), up to 30 bar with reinforced designs
flow rate: 0-3 m/s recommended, avoid stagnant or turbulent flows
temperature: -5°C to 80°C (typical), up to 120°C with special designs
slurry concentration: ≤15% solids by weight, particle size <100 μm
Media Compatibility
✓ Aqueous solutions (pH 0-14) ✓ Food/beverage processing media ✓ Chemical process streams with moderate ionic strength
Unsuitable: Hydrofluoric acid (HF) or concentrated fluoride solutions
Sizing Data Required
  • Process connection type/thread standard
  • Electrode diameter compatibility
  • Required response time/electrolyte diffusion rate

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced leakage
Cause: Exposure to corrosive fluids or atmospheric conditions leading to material degradation and loss of sealing integrity at junction points.
Mechanical fatigue cracking
Cause: Cyclic stress from vibration, thermal expansion/contraction, or pressure fluctuations causing crack initiation and propagation at stress concentration points.
Maintenance Indicators
  • Visible fluid seepage or staining around junction connections
  • Audible hissing or whistling indicating pressure loss or turbulent flow at junctions
Engineering Tips
  • Implement regular torque verification on junction fasteners to maintain proper gasket compression and prevent loosening from vibration
  • Apply protective coatings or cathodic protection systems to junction surfaces exposed to corrosive environments

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality management systems ASME B16.5 - Pipe flanges and flanged fittings EN 10204:2004 - Metallic products - Types of inspection documents
Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Surface flatness: 0.1mm per 100mm
Quality Inspection
  • Dimensional verification with CMM
  • Pressure test to 1.5x working pressure

Factories Producing Junction

Verified manufacturers with capability to produce this product in China

✓ 93% Supplier Capability Match Found

S Sourcing Manager from Germany Feb 21, 2026
★★★★★
"Testing the Junction now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
P Procurement Specialist from Brazil Feb 18, 2026
★★★★☆
"Impressive build quality. Especially the technical reliability is very stable during long-term operation. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Canada Feb 15, 2026
★★★★★
"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Junction meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

16 sourcing managers are analyzing this specification now. Last inquiry for Junction from Mexico (1h ago).

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Frequently Asked Questions

What is the function of the junction in a pH sensor?

The junction is the electrical connection point within a pH sensor where the reference electrode and measurement electrode meet, allowing ion exchange to maintain a stable reference potential for accurate pH measurements.

What materials are commonly used for pH sensor junctions?

Common junction materials include porous ceramic for general applications, PTFE (Polytetrafluoroethylene) for chemical resistance, and glass frit for specialized measurements, each offering different flow rates and durability.

How often should a pH sensor junction be replaced?

Replacement frequency depends on usage and measurement conditions, but junctions typically require replacement every 6-12 months or when measurements become unstable, clogged, or contaminated.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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