Project Background

A certain space launch site in Northwest China serves as the core infrastructure of a national major space project, undertaking the liquid propellant filling operations for carrier rockets. The original gas monitoring system in the propellant filling area has aged, resulting in slow response to leaks of UDMH (Unsymmetrical Dimethylhydrazine) and NTO (Nitrogen Tetroxide), which fails to meet the latest specifications stipulated in “GJB 5379-2005 Safety Regulations for Pyrotechnic Articles” and “GJB 1648 Requirements for Safe Use of Liquid Propellants”.

Customer Pain Points

  • UDMH is classified as a Class I carcinogen, and the accuracy of personal dose monitoring for operators involved in refueling operations must reach 0.5 mg/m³
  • NTO is a strong oxidizer and will ignite upon contact with combustible materials. An early warning threshold of 5 mg/m³ is required.
  • The hydrogen leakage requirement for liquid hydrogen refueling stations is to trigger an alarm at 1% LEL, with the original electrochemical sensor response time exceeding 60 seconds.
  • The deployment requirements for the military’s private network must support encrypted local communication (IPSec / national cryptography SM4)
  • The test command center requires large-screen visual integration

U-Rion Solution

  • UDMH Monitoring: 48 sets of customized electrochemical sensors, with a resolution of 0.1 mg/m³ and a response time of < 15 seconds
  • NTO Monitoring: 32 sets of infrared sensors, with a range of 0-50 ppm
  • Liquid Hydrogen Refueling Station: 16 sets of H₂ monitors + 8 sets of O₂ monitors
  • Personal Protective Equipment: 32 YQBJ portable four-in-one alarm whistles, one for each operator involved in the filling operation
  • Intrinsically Safe and Explosion-Proof: All probes are dual-certified as Ex d IIC T6 / Ex ia IIC T4 Ga
  • Encrypted Communication Gateway: Self-developed military-grade data collector, supporting IPSec + national cryptography SM4 encryption
  • Command Center Visualization: Integrated with the launch site command system, gas concentration, wind direction, and personnel location are displayed on a unified large screen.

Implementation Effect

  • The response time for UDMH leak detection has been reduced from 60 seconds to 15 seconds
  • Retain 100% of the personal dose records of the filling personnel
  • The visualization coverage rate of gas concentration data in the test command center is 100%.
  • Passed the EHS system audit conducted by the National Space Administration, with zero major accidents