QX/T 567-2020 in English

Interpretation of the core content of the standard

This standard specifies the technical requirements for the full life cycle of the automatic soil moisture observation instrument, which mainly includes three major technical systems:

Technical system	Core indicators	Test methods
Measurement performance	Volume moisture content 0-60% range, ±2.5% (laboratory)/±5% (field) error	Soil sample test method specified in Appendix B/C
Environmental adaptability	-40℃~60℃ working temperature, IP68 protection level	GB/T2423 series environmental tests
Data quality	10min averaging algorithm, 31 days local storage	Chapter 6.2 Functional verification

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Detailed explanation of key technical requirements

5.3 Performance indicators

The instrument must meet the third-order measurement accuracy:

• Resolution 0.1%
• Annual stability ±2.5%
• MTBF≥16000 hours

Appendix A gives the soil moisture calculation formula: $$w=\frac{Q×ρ_水}{ρ}$$ Where ρ represents the soil bulk density, which is a key parameter affecting the measurement accuracy.

5.4 Environmental adaptability

Six rigorous tests to ensure field reliability:

1. -40℃ low temperature storage
2. 5% salt spray for 48 hours
3. 50m/s² mechanical shock
4. 8kV electrostatic discharge
5. 3V/m radio frequency interference
6. 2kV surge shock

The buried part must meet the IP68 waterproof grade (0.01MPa water pressure).

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Implementation suggestions

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Standard Evolution Analysis

Compared with the earlier specifications, QX/T567-2020 has the following major improvements:

• Added an algorithm for effective soil moisture storage (Appendix A.3)
• Refined electromagnetic compatibility indicators (Chapter 5.4.3)
• Cleared the requirements for the remote upgrade function (Clause 5.2.7)
• Supplemented the laboratory soil sample preparation process (Appendix B)

This standard complements GB/T33705-2017 and jointly builds a soil moisture observation technology system.