---
title: "Sensor Tube/Bypass"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SENSOR_TUBEBYPASS"
  data_integrity_hash: "20776bad4ac05219c5436e3cb5ca0419"
  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:SENSOR_TUBEBYPASS"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sensor-tubebypass.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sensor-tubebypass"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-1000 sccm flow rate, -10°C to 85°C ambient temperature, 0-100 psig inlet pressure"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 1200
    unit: "sccm"
    consequence: "Thermal sensor calibration drift due to Seebeck coefficient variation beyond ±0.5 μV/K, laminar flow disruption from tube surface roughness exceeding Ra 0.4 μm, material fatigue from cyclic thermal stress exceeding 35 MPa at 10⁶ cycles"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Particulate contamination &gt;5 μm in gas stream"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Upstream 2 μm absolute filter with differential pressure monitoring"
  - node_2:
      trigger: "Thermal shock from rapid gas temperature change &gt;20°C/second"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Bimetallic thermal expansion compensation with Invar 36 alloy inserts"
bom_nodes:
  sensor-tube-body:
    type: "component"
    urn: "URN:CNFX:ME:SENSOR_TUBE_BODY"
    interface_type: "physical-logic-coupled"
  thermal-sensor-elements:
    type: "component"
    urn: "URN:CNFX:ME:THERMAL_SENSOR_ELEMENTS"
    interface_type: "physical-logic-coupled"
  bypass-channel-orifice:
    type: "component"
    urn: "URN:CNFX:ME:BYPASS_CHANNEL_ORIFICE"
    interface_type: "physical-logic-coupled"
  sealsgaskets:
    type: "component"
    urn: "URN:CNFX:ME:SEALSGASKETS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 4401:2005 (HYDRAULIC FLUID POWER - FOUR-PORT DIRECTIONAL CONTROL VALVES - MOUNTING SURFACES)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sensor-tubebypass.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "8021694e898e5b0d4e36d2e90f89de01d346f6e4868e054254ef3cbc5de55d94"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Sensor Tube/Bypass

## 1. Technical Definition
A precision component within a Mass Flow Controller that houses the thermal sensor and provides a calibrated flow path for accurate gas measurement.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-1000 sccm flow rate, -10°C to 85°C ambient temperature, 0-100 psig inlet pressure**. Failure boundary: **Flow rate exceeding 1200 sccm causes sensor saturation, temperature exceeding 125°C degrades thermal sensor calibration, pressure exceeding 150 psig causes tube deformation &gt;0.1mm**, Mechanism: **Thermal sensor calibration drift due to Seebeck coefficient variation beyond ±0.5 μV/K, laminar flow disruption from tube surface roughness exceeding Ra 0.4 μm, material fatigue from cyclic thermal stress exceeding 35 MPa at 10⁶ cycles**.

### 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 |
| :--- | :--- | :--- | :--- |
| Particulate contamination &gt;5 μm in gas stream | 8 | Flow path obstruction causing ±15% measurement error | Upstream 2 μm absolute filter with differential pressure monitoring |
| Thermal shock from rapid gas temperature change &gt;20°C/second | 8 | Sensor tube thermal stress cracking at weld joints | Bimetallic thermal expansion compensation with Invar 36 alloy inserts |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Precision CNC Lathe**, **Laser Welding System**, **Gas Flow Calibration Bench**  
**Downstream Applications**: Mass Flow Controller, Gas Delivery System, Process Control Instrumentation  

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

### Q: What materials are available for the sensor tube/ bypass component?
**A**: The sensor tube/ bypass is available in Stainless Steel 316L, Hastelloy C-276, and Aluminum to suit different industrial gas measurement applications and environmental conditions.

### Q: How does the sensor tube/ bypass ensure accurate gas flow measurement?
**A**: It houses thermal sensor elements within a precisely calibrated flow path, maintaining consistent gas flow characteristics for reliable measurement in Mass Flow Controllers.

### Q: What are the main components in the sensor tube/ bypass BOM?
**A**: The bill of materials includes the Sensor Tube Body, Thermal Sensor Elements, Bypass Channel Orifice, and Seals/Gaskets, all engineered for precision and durability in machinery manufacturing applications.

## 6. Manufacturing Compliance
- ISO 4401:2005 (HYDRAULIC FLUID POWER - FOUR-PORT DIRECTIONAL CONTROL VALVES - MOUNTING SURFACES)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Sensor Tube/Bypass](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sensor-tubebypass)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SENSOR_TUBEBYPASS | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 9214c07c
