Description
1. Product Overview
2. Key Features
MKII second-generation upgraded version with optimized internal formula
High precision ppm-level ultra-low oxygen measurement capability
Fast T90 response time and rapid signal recovery
Ultra-low monthly drift, excellent long-term stability
Low temperature coefficient, stable output under variable temperature
Enhanced anti-interference and anti-poisoning performance against background mixed gases
Standard DU concentric ring interface, plug-and-play replacement
Sealed compact cylindrical 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 |
|---|---|
| Product Model | DU-2/MKII |
| Working Principle | Divided-potential Electrochemical |
| Measuring Range | 0～10 ppm (custom range available) |
| T90 Response Time | ≤ 7 s |
| Full Scale Accuracy | ±2% F.S. |
| Linearity Error | ≤ ±2% F.S. |
| Monthly Long-term Drift | ≤ 0.8% F.S. |
| Temperature Coefficient | ≤ 2.8% / °C |
| Operating Temperature | 0°C ~ +50°C |
| Operating Humidity | 0%～95% RH (Non-condensing) |
| Operating Pressure | 80 kPa ~ 120 kPa |
| Design Service Life | ≥ 24 months |
| Shelf Life | 12 months (sealed original packaging) |
3.2 Mechanical & Interface Parameters
| Parameter | Specification |
|---|---|
| Package Type | Standard cylindrical DU package |
| Interface Mode | DU standard gold-plated concentric ring |
| Housing Material | HDPE High Density Polyethylene |
| Net Weight | Approx. 5 g |
| Matching Base | DPD02027 / DPD08063 |
| Matching Module | DIM5-1 / DELOMATIC-3/DGU1 |
4. Application Scope
Trace oxygen monitoring for nitrogen, argon and hydrogen production industry
Semiconductor process gas and protective atmosphere detection
Laboratory glove boxes, inert atmosphere furnaces and vacuum cabinets
Portable trace oxygen analyzers and fixed online monitoring instruments
Petrochemical and metallurgical shielding gas pipeline monitoring
Residual oxygen detection for food and pharmaceutical packaging systems
5. Installation and Operation Instructions
5.1 Installation Requirements
Install vertically with gas inlet upward; keep the air inlet unobstructed.
Use matched DPD dedicated base; insert vertically in place without forced twisting.
Adopt sealed gas path connection; PTFE tubing is recommended.
Recommended gas flow rate: 200～500 mL/min; avoid excessive airflow impact.
Keep away from high temperature heat sources, strong vibration and corrosive gas environments.
5.2 Warm-up and Calibration
Power on and warm up for 10–15 minutes before calibration and formal measurement.
Zero Calibration: Apply high-purity nitrogen (0 ppm O₂) to complete zero point calibration.
Span Calibration: Use standard low-oxygen calibration gas for span adjustment.
Recalibration is required when ambient temperature or working conditions change greatly.
6. Safety Precautions
This sensor is non-explosion-proof; do not use in flammable and explosive hazardous areas.
Prevent condensed water, oil mist and dust from entering the air inlet.
Take ESD protection measures during handling and installation.
Do not disassemble the sensor housing privately to avoid electrolyte leakage and permanent failure.
Avoid long-term exposure to strong corrosive gases such as SO₂, Cl₂ and H₂S.
7. Maintenance and Storage
Perform zero and span calibration regularly every 3–6 months according to service conditions.
Keep the air inlet filter clean; replace the filter once blocked or contaminated.
Store in sealed original package at 10～30°C, 30%～70% RH in a cool and dry place.
Avoid direct sunlight, high temperature and humid stacked storage.
8. Troubleshooting
| Fault Phenomenon | Possible Cause | Solution |
|---|---|---|
| No signal output | Poor contact / wrong insertion direction | Reinstall sensor correctly; check base contact |
| Unstable reading | Insufficient warm-up / gas flow fluctuation | Fully preheat; stabilize gas flow rate |
| Slow response speed | Air inlet blocked / sensor aging | Clean filter; recalibrate or replace sensor |
| Large measurement drift | Temperature mutation / expired calibration | Temperature compensation and recalibration |
9. Warranty & Disclaimer
Model: DU-2/MKII Trace Oxygen Sensor
Warranty period: 12 months from delivery date under normal installation and use.
Warranty shall be invalid for damage caused by forced disassembly, improper installation, liquid immersion and artificial damage.
All specifications are subject to technical upgrade without prior notice.
The manufacturer reserves the right of final interpretation of product structure and performance.
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