---
title: "pH/Conductivity Sensor"
industry: "Chemical Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PHCONDUCTIVITY_SENSOR"
  data_integrity_hash: "57891500ac9d90147444265473e579ba"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:PHCONDUCTIVITY_SENSOR"
  data_source_uri: "https://cnfx.com/llms/industry/chemical-manufacturing/product/phconductivity-sensor.md"
  official_resource_url: "https://cnfx.com/industry/chemical-manufacturing/product/phconductivity-sensor"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "pH: 0-14, Conductivity: 0-200 mS/cm, Temperature: 0-100°C, Pressure: 0-10 bar"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 15
    unit: "bar"
    consequence: "Glass membrane mechanical failure due to pressure differential exceeding Young's modulus limit (70 GPa for pH glass), reference electrode potential drift from KCl diffusion depletion (Nernst equation deviation &gt;59.16 mV/pH), conductivity cell electrode polarization at high ionic concentrations causing measurement nonlinearity"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Process fluid crystallization on pH glass membrane"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated ultrasonic cleaning system operating at 40 kHz with 15-minute intervals"
  - node_2:
      trigger: "Galvanic corrosion between 316L stainless steel body and Hastelloy C-276 electrodes"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Cathodic protection system with -0.85 V potential relative to Ag/AgCl reference electrode"
bom_nodes:
  ph-electrode:
    type: "part"
    urn: "URN:CNFX:ME:PH_ELECTRODE"
    interface_type: "physical-logic-coupled"
  conductivity-cell:
    type: "part"
    urn: "URN:CNFX:ME:CONDUCTIVITY_CELL"
    interface_type: "physical-logic-coupled"
  temperature-sensor:
    type: "part"
    urn: "URN:CNFX:ME:TEMPERATURE_SENSOR"
    interface_type: "physical-logic-coupled"
  sensor-housing:
    type: "component"
    urn: "URN:CNFX:ME:SENSOR_HOUSING"
    interface_type: "physical-logic-coupled"
  cable-connection:
    type: "component"
    urn: "URN:CNFX:ME:CABLE_CONNECTION"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 15839:2006 (WATER QUALITY - ON-LINE SENSORS/ANALYSING EQUIPMENT FOR WATER)"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING (EU DIRECTIVE 2014/35/EU FOR ELECTRICAL EQUIPMENT SAFETY)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/chemical-manufacturing/product/phconductivity-sensor.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b29864c9747ae33a9d1b84264f187cf970aa0883dba0f0d5efe02265fbd0a790"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: pH/Conductivity Sensor

## 1. Technical Definition
A dual-function sensor that measures both pH (acidity/alkalinity) and conductivity (ionic concentration) in liquid solutions for process monitoring and control.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **pH: 0-14, Conductivity: 0-200 mS/cm, Temperature: 0-100°C, Pressure: 0-10 bar**. Failure boundary: **pH glass membrane fracture at 15 bar differential pressure, reference electrode KCl depletion at 5000 hours continuous operation, conductivity cell polarization at 250 mS/cm**, Mechanism: **Glass membrane mechanical failure due to pressure differential exceeding Young's modulus limit (70 GPa for pH glass), reference electrode potential drift from KCl diffusion depletion (Nernst equation deviation &gt;59.16 mV/pH), conductivity cell electrode polarization at high ionic concentrations causing measurement nonlinearity**.

### 2.1 Analytical Physics Model
Governed by the **Hansen Solubility Distance (HSP)**:

> **Primary Equation**: $R_a = \sqrt{4\Delta\delta_d^2 + \Delta\delta_p^2 + \Delta\delta_h^2}$  
> **Engineering Impact**: Predicts seal/gasket swelling when exposed to CIP chemicals.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| \delta_d | Dispersive | Engineering Constant |
| \delta_p | Polar | Engineering Constant |
| \delta_h | Hydrogen | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Process fluid crystallization on pH glass membrane | 8 | pH measurement drift exceeding ±0.1 pH units/hour | Integrated ultrasonic cleaning system operating at 40 kHz with 15-minute intervals |
| Galvanic corrosion between 316L stainless steel body and Hastelloy C-276 electrodes | 8 | Conductivity measurement error &gt;2% FS due to electrode surface degradation | Cathodic protection system with -0.85 V potential relative to Ag/AgCl reference electrode |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [pH Electrode](https://cnfx.com/llms/industry/chemical-manufacturing/product/ph-electrode.md) `(Standalone System)`
- [Conductivity Cell](https://cnfx.com/llms/industry/chemical-manufacturing/product/conductivity-cell.md) `(Standalone System)`
- [Temperature Sensor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/temperature-sensor.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Process Controller**, **Calibration Station**, **Sample Conditioning System**  
**Downstream Applications**: Pharmaceutical Solutions, Industrial Cleaners, Water Treatment Chemicals  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: How does this dual-function sensor improve chemical manufacturing processes?
**A**: This sensor simultaneously measures pH and conductivity, providing comprehensive solution analysis for real-time process control, reducing manual sampling and improving reaction consistency in chemical manufacturing.

### Q: What maintenance is required for the glass membrane and platinum electrodes?
**A**: Regular calibration with standard solutions, gentle cleaning to prevent membrane fouling, and proper storage in electrode storage solution are recommended to maintain accuracy and extend sensor lifespan.

### Q: Can this sensor handle corrosive chemicals in manufacturing environments?
**A**: Yes, the epoxy housing provides chemical resistance, while the glass membrane and platinum electrodes are designed to withstand corrosive solutions commonly encountered in chemical processing applications.

## 6. Manufacturing Compliance
- ISO 15839:2006 (WATER QUALITY - ON-LINE SENSORS/ANALYSING EQUIPMENT FOR WATER)
- CE MARKING (EU DIRECTIVE 2014/35/EU FOR ELECTRICAL EQUIPMENT SAFETY)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: pH/Conductivity Sensor](https://cnfx.com/industry/chemical-manufacturing/product/phconductivity-sensor)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: PHCONDUCTIVITY_SENSOR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 5a681231
