When choosing a nitrogen generator with an oxygen analyzer, don't just focus on whether it can measure oxygen - you also need to consider nitrogen purity, residual oxygen concentration, sample gas conditions, and on-site communication requirements. Choosing the right principle and measurement range ensures more stable online monitoring and easier maintenance.
Runlai Instruments offers a variety of online analytical instruments for zirconia, microelectrochemistry, and paramagnetic oxygen, which can be adapted to different nitrogen production conditions. Let's break it down into four aspects: detection principle, key parameters, functional installation, and selection tips.
Recommended: Zirconia oxygen analyzer
The zirconia instrument uses zirconia high-temperature detection technology, offering fast response and long service life with a T90 ≤ 30 seconds, suitable for 24-hour continuous monitoring in conventional nitrogen production units.
Note: The sample gas must not contain combustible components such as H₂ or CO
Recommended: Microelectrochemical oxygen analyzer
Microelectrochemical analyzer, specifically designed for ppm-level oxygen detection, operates at room temperature with high resolution. The sample gas must be pre-filtered to ensure it is dust-free, oil-free, and water-free, preventing rapid sensor degradation.
Recommendation: Paramagnetic oxygen analyzer
Paramagnetic oxygen meters work on the principle of magnetic mechanical detection, have no consumables, offer strong stability, and good resistance to interference, making them suitable for long-term monitoring of oxygen content at the percentage level. Not suitable for ppm-level trace oxygen applications.
The target residual oxygen level should ideally fall within the 1/3 to 2/3 range of the instrument's measurement range.
For 99% nitrogen: Select 0–10% O₂ range.
For 99.9% nitrogen: Select 0–1% O₂ range.
For high-purity nitrogen: Select 0–100/1000ppm trace oxygen range.
This ensures better measurement resolution.
Accuracy: ≤±1.5% F.S.
Repeatability: ≤±0.5% F.S.
Stability: ≤±1% F.S.
Response time: T90 ≤30s
Abnormal purity levels trigger rapid alarms.
Sample gas flow rate: 400±50ml/min
Inlet pressure: -50kPa to 0.25MPa (adjustable)
Sample gas requirements: Dust-free, oil-free, water-free, requires a pre-filter.
The oxygen analyzer features a color high-definition touchscreen with English/Chinese interface switching, automatic self-check at startup; supports local data storage (over one million records), with USB export option for easy data tracking.
The instrument supports 4-20mA and RS485 communication protocols, allowing integration with nitrogen generator PLCs for over-limit venting and relay interlock alarms. Available in cabinet-mounted online and portable sampling versions, with explosion-proof models available for hazardous environments.
1. The pretreatment system is essential. Filters for removing water, oil, and dust are key to extending the lifespan of sensors.
2. Zirconia instruments must not be used with sample gases containing combustible gases.
3. The instruments support air calibration, making them easy to maintain on-site.
Conclusion
When selecting an oxygen analyzer for a nitrogen generator, the logic can be summarized as follows: first determine the nitrogen purity and residual oxygen range, then match the detection principle, range, sample gas conditions, and communication capabilities. Runlai Instruments offers a variety of online analysis instruments including zirconia, microelectrochemical, and paramagnetic oxygen sensors, and can provide selection assistance based on actual operating conditions.
