QX/T 475-2019 in English

Analysis of the core content of the standard

This standard clearly stipulates the system architecture, technical parameters and detection methods of the capacitive inhalation method air negative ion automatic measuring instrument. Its core technical indicators include:

Detailed explanation of key technical requirements

4.1 System modular design

The standard requires that the instrument must adopt a modular architecture of plate collector, collector and peripheral devices:

• Plate collector: Contains parallel metal plates and fans, polarization voltage ≥16V
• Collector: Must be equipped with 16-bit A/D conversion circuit, data storage ≥10 days
• Environmental adaptability: Working temperature -30℃~50℃, humidity 10%~100%RH

5.2 Performance indicator matrix

Instrument stability requirements in extreme environments:

• Requires normal operation in high humidity environments (≥85%RH)
• Plate short-circuit protection response time <1 second
• MTBF >2500 hours

Implementation and application recommendations

Key points for equipment selection

According to the QX/T 419-2018 observation specification, it is recommended to give priority to:

1. Equipment with dual power supply modes (AC220V/DC24V)
2. Configure lightning protection and grounding measures (resistance <4Ω)
3. Models with temperature/humidity compensation functions

Maintenance and management specifications

Based on clause 6.6 of the standard, it is recommended that:

• Consistency testing of three instruments is performed quarterly
• Check plate cleanliness monthly
• Ion mobility parameters are calibrated annually

Technology Evolution Analysis

Main improvements compared to earlier versions:

• Measurement accuracy: A/D conversion improved from 12 bits to 16 bits
• Environmental adaptability: Operating temperature range extended by 10°C
• Intelligence: New wireless communication and fault self-diagnosis functions