LS/T 1221-2020 in English
VALIDCode of practice on on-line monitoring of stored grain pests
- Issued on:2020-11-19
- Implemented on:2021-05-19
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
Introduction
Analysis of standard technical framework
| Monitoring technology | Applicable scenarios | Data unit | Core indicators |
|---|---|---|---|
| Corrugated plate trap | Smooth grain surface | heads/7d | ≥11 heads/7d is considered seriously insect-infested grain |
| Probe trap | Bulk grain pile | heads/7d | Requires an off-site extraction system |
| Carbon dioxide monitoring | Closed granary | mL/m³ | Concentration＞1000mL/m³ requires key inspection |
Key technical innovations
Multimodal monitoring fusion:The standard integrates 4 types of monitoring technologies for the first time:
- Surface trap (corrugated plate/viscose plate)
- Probe-type deep monitoring
- Video image analysis (requires 1cm² observation grid)
- Carbon dioxide biological metabolism monitoring
A typical case shows that the carbon dioxide monitoring device gave an early warning of a booklice outbreak in a grain depot in Henan Province 7 days in advance, which is 300% higher than the traditional detection efficiency.
Implementation difficulties and countermeasures
Device selection suggestions
- Stainless steel probe tube traps are preferred in high temperature and high humidity environments
- Video monitoring must ensure ≥1.3 million pixel cameras
- The error of the carbon dioxide sensor should be <±50mL/m³
Point layout optimization plan
According to Clause 4.3 of the standard, it is recommended to adopt the five-zone layout method:
Four corners + center + 2 high temperature points + 1 susceptible point
Data evaluation system
The determination of insect food grade needs to be combined with:
| Technology | General insect food threshold | Severe insect food threshold |
|---|---|---|
| Surface trapping | 6-10 heads/7d | ≥11 heads/7d |
| Video monitoring | 1-2 heads/cm²·7d | ≥3 heads/cm²·7d |
Note: Booklice pests require additional observation of aggregation area indicators
Standard evolution trend
Main breakthroughs of this standard compared with GB/T 29890:
- Newly added standardized method for remote video counting
- Clarified the quantitative relationship between carbon dioxide concentration and insect pests
- Specified the communication protocol of monitoring devices (must comply with GB/T 26882.4)
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