Description
1. Product Overview
2. Key Features
MKII second-generation upgraded version, optimized internal formula
High precision ppm-level trace oxygen measurement
Fast T90 response and rapid signal recovery
Ultra-low monthly drift, excellent long-term stability
Improved temperature resistance, small temperature coefficient
Enhanced anti-interference and anti-poisoning capability against mixed gases
Standard DU interface, plug-and-play replacement
Sealed compact structure, easy installation and field maintenance
Long service life, suitable for 24-hour continuous online monitoring
3. Technical Specifications
3.1 Performance Parameters
| Parameter | Specification |
|---|---|
| Model | DU-2/MKII |
| Working Principle | Divided-potential Electrochemical Oxygen Sensor |
| Measuring Range | 0～10 ppm (custom range optional) |
| T90 Response Time | ≤ 7 s |
| Accuracy | ±2% FS |
| Linearity Error | ≤ ±2% FS |
| Monthly Long-term Drift | ≤ 0.8% FS |
| Temperature Coefficient | ≤ 2.8%/°C |
| Operating Temperature | 0°C ~ +50°C |
| Working Humidity | 0%～95% RH, non-condensing |
| Working Pressure | 80～120 kPa |
| Service Life | ≥ 24 months |
| Shelf Life | 12 months (sealed original package) |
3.2 Mechanical & Interface Parameters
| Parameter | Specification |
|---|---|
| Structure | Cylindrical standard DU package |
| Interface Type | DU standard concentric ring interface |
| Housing Material | High-density polyethylene HDPE |
| Net Weight | Approx. 5 g |
| Matching Base | DPD02027 / DPD08063 |
| Matching Module | DIM5-1 / DELOMATIC-3/DGU1 |
4. Application Scope
Nitrogen, argon, hydrogen industrial trace oxygen online monitoring
Semiconductor manufacturing process gas and protective atmosphere detection
Laboratory glove box, inert atmosphere furnace and vacuum cabinet
Portable trace oxygen analyzer and fixed online monitoring equipment
Petrochemical, metallurgy shielding gas pipeline monitoring
Food and pharmaceutical packaging residual oxygen detection system
5. Installation & Operation Guide
5.1 Installation
Install vertically with the gas inlet facing upward, keep the vent unobstructed.
Use matched DPD dedicated base; insert vertically in place, do not twist forcibly.
Adopt sealed gas path connection; PTFE tube is recommended.
Recommended gas flow: 200～500 mL/min; avoid over-speed airflow impact.
Keep away from high temperature, strong vibration and corrosive gas environment.
5.2 Preheating & Calibration
Power on and preheat for 10–15 minutes before calibration and official use.
Zero Calibration: Use high-purity nitrogen (0 ppm O₂) to set zero point.
Span Calibration: Use standard low oxygen gas for span calibration.
When ambient temperature or working condition changes greatly, recalibration is required.
6. Safety Precautions
Non-explosion-proof design; prohibited for direct use in flammable and explosive hazardous areas.
Prevent condensed water, oil mist and dust from entering the air inlet.
Take anti-static protection during handling and installation.
Do not disassemble the sensor shell privately to avoid electrolyte leakage and permanent failure.
Avoid long-term exposure to strong corrosive gases such as SO₂, Cl₂ and H₂S.
7. Maintenance & Storage
Regular zero and span calibration every 3–6 months according to application environment.
Keep the inlet filter clean; replace it once blocked or contaminated.
Store in sealed package at 10～30°C, 30%～70% RH, cool dry place.
Avoid direct sunlight, high temperature and damp stacking.
8. Troubleshooting
| Fault Phenomenon | Possible Cause | Solution |
|---|---|---|
| No signal output | Poor contact / wrong insertion direction | Reinstall sensor; check DPD base terminal |
| Unstable reading | Insufficient preheating / airflow fluctuation | Fully preheat; stabilize gas flow |
| Slow response | Air inlet blocked / sensor aging | Clean filter; recalibrate or replace sensor |
| Large drift | Temperature mutation / overdue calibration | Temperature compensation + recalibration |
9. Warranty & Disclaimer
Product Model: DU-2/MKII Trace Oxygen Sensor
Warranty Period: 12 months from delivery date under normal installation and use.
Warranty void for damage caused by forced disassembly, improper installation, liquid immersion and human damage.
All specifications are subject to technical upgrade without prior notice.
The manufacturer reserves the right of final interpretation of product structure and parameters。
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