A large petrochemical enterprise operates an advanced hydrocracking unit. Under high temperature, high pressure and catalytic conditions, its hydrogenation reactor utilizes hydrogen to process heavy oil into high-value light distillates including gasoline and diesel. Hydrogen purity is critical to this process: even trace oxygen mixed into hydrogen entering the reactor may trigger violent reactions with hydrogen under extreme thermal and pressure conditions. Such incidents damage costly catalysts, degrade catalytic activity and reduce reaction efficiency, while posing severe safety hazards such as explosions.

Original Analyzer Selection Criteria:
【Test accuracy and range】
Given stringent process requirements for hydrogen purity, an analyzer capable of detecting ultra-trace oxygen concentrations was required. The selected hydrogen-in-oxygen analyzer achieves measurement accuracy of ±0.5 ppm with a measuring range of 0–10 ppm, enabling precise capture of minimal oxygen fluctuations in hydrogen to facilitate timely countermeasures and guarantee safe, efficient reactor operation.
【Stability & Reliability】
Hydrocracking units run continuously all year round with only brief annual maintenance shutdowns, requiring analyzers with exceptional long-term stability to operate reliably under harsh industrial conditions including high temperature, high humidity and trace corrosive gases. The enterprise adopted Chengdu HonryTech HT-SY50-EX explosion-proof gas analysis system, an integrated solution combining HT-FX100 flameproof hydrogen-in-oxygen analyzer and sampling pretreatment modules. Equipped with high-quality electrochemical sensors and multi-redundancy design, the analyzer features built-in temperature and pressure compensation mechanisms to counter complex ambient conditions surrounding reactors, maintaining consistent, accurate measurement data and operating stably for months without manual calibration during field deployment.

【Functionality & Usability】
The HT-FX100 hydrogen-in-oxygen analyzer is fitted with an intuitive LCD screen that clearly displays real-time oxygen concentration and historical data logs for convenient operator review. It supports remote monitoring via connection to the plant central control system, allowing technicians to track oxygen levels in hydrogen from the control room. Over-limit alarm functions are configured to activate audible and visual alerts and transmit alarm signals to the central control system once oxygen concentration approaches dangerous thresholds (e.g., exceeding 2 ppm), notifying on-site and remote staff to implement timely interventions and prevent safety hazards.
【After-sales Support】
Considering severe production disruptions caused by equipment failures, the enterprise conducted thorough evalsuation of manufacturers’ after-sales capabilities. Chengdu HonryTech Science and Technology Co., Ltd. was selected for its professional after-sales maintenance team offering 24-hour response service, regular equipment follow-up visits and preventive maintenance to sustain optimal equipment performance. HonryTech maintains sufficient spare parts inventory to enable rapid component replacement and minimize equipment downtime.

【Performance】
Since commissioning the HT-SY50-EX explosion-proof gas analysis system, its high-precision measurement and consistent reliable performance have enabled timely, accurate detection of abnormal oxygen fluctuations in hydrogen during daily reactor operation. Operators can proactively adjust hydrogen supply systems and identify potential oxygen ingress sources, effectively preserving catalyst activity and sustaining efficient, stable hydrocracking reactions. Comprehensive alarm and remote monitoring functions enhance overall production safety, eliminating safety incidents triggered by excessive oxygen and delivering significant contributions to stable plant operation and improved economic benefits.