---
title: "Humidity Sensor"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:HUMIDITY_SENSOR"
  data_integrity_hash: "70229cac0f720db8b1cb2bbaa67bbfd6"
  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:HUMIDITY_SENSOR"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/humidity-sensor.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/humidity-sensor"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-100% RH at -40°C to 85°C ambient temperature, 0-5V DC output"
    unit: "%RH"
engineering_limits:
  max_safe_operating_point:
    value: 24
    unit: "hours"
    consequence: "Capacitive polymer dielectric breakdown at dew point (saturation vapor pressure 6.11 hPa at 0°C), hygroscopic swelling causing mechanical stress &gt;2 MPa on MEMS structure"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Condensation forming on sensing element at dew point temperature differential &gt;3°C"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated Peltier heater maintaining sensor 5°C above ambient dew point with PID control (Kp=2.5, Ki=0.1, Kd=0.5)"
  - node_2:
      trigger: "Ionic contamination from airborne salts (NaCl, KNO3) at &gt;50 μg/m³ concentration"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Nafion membrane filter with 0.3 μm pore size and electrostatic precipitation at -5 kV bias"
bom_nodes:
  hygroscopic-sensing-element:
    type: "component"
    urn: "URN:CNFX:ME:HYGROSCOPIC_SENSING_ELEMENT"
    interface_type: "physical-logic-coupled"
  electrode-grid:
    type: "part"
    urn: "URN:CNFX:ME:ELECTRODE_GRID"
    interface_type: "physical-logic-coupled"
  protective-housing:
    type: "part"
    urn: "URN:CNFX:ME:PROTECTIVE_HOUSING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 4677-1:1985 - ATMOSPHERES FOR CONDITIONING AND TESTING - DETERMINATION OF RELATIVE HUMIDITY"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/ASHRAE 41.6-2014 - STANDARD METHOD FOR MEASUREMENT OF MOIST AIR PROPERTIES"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 60751:2008 - INDUSTRIAL PLATINUM RESISTANCE THERMOMETERS AND PLATINUM TEMPERATURE SENSORS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/humidity-sensor.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "65ab1fcaef3ea50b31deeb7bbb3a81278efeed3a5d028311a132ac2942ad3371"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Humidity Sensor

## 1. Technical Definition
A device that measures and monitors the amount of water vapor present in the air or other gases.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-100% RH at -40°C to 85°C ambient temperature, 0-5V DC output**. Failure boundary: **Condensation at 100% RH causing sensor element short-circuit, or exposure to &gt;95% RH for &gt;24 hours leading to permanent calibration drift &gt;±5%**, Mechanism: **Capacitive polymer dielectric breakdown at dew point (saturation vapor pressure 6.11 hPa at 0°C), hygroscopic swelling causing mechanical stress &gt;2 MPa on MEMS structure**.

### 2.1 Analytical Physics Model
Governed by the **Combined Measurement Uncertainty**:

> **Primary Equation**: $u_c = \sqrt{\sum u_i^2}$  
> **Engineering Impact**: Defines the precision confidence interval for inspection.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| u_i | Standard Uncertainty components | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Condensation forming on sensing element at dew point temperature differential &gt;3°C | 8 | Capacitance measurement error &gt;±15% due to water film dielectric constant ε=80 vs air ε=1 | Integrated Peltier heater maintaining sensor 5°C above ambient dew point with PID control (Kp=2.5, Ki=0.1, Kd=0.5) |
| Ionic contamination from airborne salts (NaCl, KNO3) at &gt;50 μg/m³ concentration | 8 | Polymer dielectric polarization loss increasing leakage current &gt;1 μA at 1 MHz | Nafion membrane filter with 0.3 μm pore size and electrostatic precipitation at -5 kV bias |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Electrode Grid](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/electrode-grid.md) `(Standalone System)`
- [Protective Housing](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/protective-housing.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Environmental Test Chamber**, **Calibration Equipment**, **Data Acquisition System**  
**Downstream Applications**: Smart Thermostats, Industrial Process Controllers, HVAC Systems  

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

### Q: What makes this humidity sensor suitable for computer and electronics manufacturing?
**A**: Our sensor uses a polymer-based hygroscopic film and ceramic substrate construction that provides stable, accurate readings in controlled manufacturing environments, preventing moisture damage to sensitive electronic components during production and assembly.

### Q: How does the hygroscopic sensing element work in this humidity sensor?
**A**: The polymer-based hygroscopic film absorbs or releases water vapor based on ambient humidity, changing its electrical properties. This change is measured by the metal electrode grid on the ceramic substrate, converting moisture levels into precise electrical signals.

### Q: What are the key applications for this sensor in optical product manufacturing?
**A**: This humidity sensor is essential for maintaining optimal conditions in clean rooms and assembly areas for optical products like lenses, cameras, and displays, where moisture control prevents fogging, condensation, and material degradation during production.

## 6. Manufacturing Compliance
- ISO 4677-1:1985 - ATMOSPHERES FOR CONDITIONING AND TESTING - DETERMINATION OF RELATIVE HUMIDITY
- ANSI/ASHRAE 41.6-2014 - STANDARD METHOD FOR MEASUREMENT OF MOIST AIR PROPERTIES
- DIN EN 60751:2008 - INDUSTRIAL PLATINUM RESISTANCE THERMOMETERS AND PLATINUM TEMPERATURE SENSORS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Humidity Sensor](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/humidity-sensor)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: HUMIDITY_SENSOR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: cdc0611b
