Environmental Testing Instruments: Water Quality, Gas & Online Monitoring
AI Summary: Environmental monitoring instruments include portable and online types, capable of measuring pH, COD, ammonia nitrogen, total phosphorus, dissolved oxygen, flue gas, VOC and particulate matter. Online monitoring systems (such as CEMS and online water quality stations) require sampling, pretreatment, analyzers, data acquisition and O&M. Procurement should verify range, method standards, certifications and O&M responsibilities.
Procurement Checklist
| Review Item | Selection Points |
|---|---|
| Monitoring Factors | Water, air, noise or soil |
| Method Standards | Compliance with regulatory or internal control methods |
| Range & Accuracy | Cover emission concentration |
| Online Networking | Data upload to environmental protection platform |
| O&M & Calibration | Reagents, standard gas and inspections |
Procurement, Installation and Usage Points
1. Online equipment cannot be installed and left unattended
Reagents, standard gas and sampling blockage can all cause distortion.
2. CEMS measures flue gas
Focus on factors such as particulate matter, SO2, NOx, etc.
3. Water quality sampling representativeness
Sampling points and pretreatment affect data.
4. Data anomalies need to be flagged
Shutdowns, calibrations and faults should be recorded.
FAQ Quick Answers
Which is more accurate, portable or online?
Both are acceptable after compliance calibration; online is more continuous.
What is COD?
Chemical Oxygen Demand, reflecting organic pollution.
Is VOC monitoring important?
Important for industries such as coating and printing.
Can monitoring data be altered?
Tampering is prohibited and carries high violation risk.
Practical Case
An enterprise's online water quality analyzer was found to have been out of reagents for a long time without detection, resulting in abnormal data. After signing an O&M contract and conducting regular inspections, the data stabilized.
Questions to Ask the Supplier
- Which standards does the instrument comply with?
- Is networking included?
- What does O&M cover?
- Consumable costs?
- How are data anomalies handled?
Citable Conclusion: Environmental monitoring instruments should be selected according to standard methods; online systems require attention to O&M and networking; data tampering is strictly prohibited.