Why choose time-proportional or flow-proportional sampling?
The composition of wastewater can vary significantly throughout the day. A spot sample therefore often does not provide a complete picture of the actual load of a wastewater stream. Representative samples are essential for permits, operating conditions, and environmental fees.
With time-proportional or flow-proportional sampling, wastewater is automatically collected over a predetermined period. This results in a reliable composite sample that provides a representative picture of the discharge.
This form of sampling is widely used in industry for monitoring campaigns, wastewater research, and the calculation of environmental fees.
Automated Sampling
Normec installs advanced sampling equipment directly at the facility’s discharge point. Wastewater is automatically collected via a suction system according to the selected measurement strategy.
Time-proportional sampling
With time-proportional sampling, the system automatically takes a sample at fixed time intervals. For example, every 15 minutes, every half hour, or every hour.
Flow-proportional sampling
With flow-proportional sampling, a sample is taken as soon as a predetermined volume of wastewater has been discharged. This ensures that sampling is aligned with the actual wastewater flow.
The sampling equipment features refrigerated storage to ensure the quality of the samples is maintained throughout the entire measurement campaign. When a sample bottle is full, the system automatically switches to the next bottle.
Our specialists provide:
- Installation of the equipment
- Configuration of the sampling
- Functionality checks
- Collection of the samples
- Transport to the laboratory
- Analysis and reporting of results
This ensures that the entire measurement campaign is carried out correctly.
Experienced partner for wastewater sampling
Normec is an accredited and independent laboratory with years of experience in wastewater research, sampling, and environmental analysis.
Our specialists conduct daily monitoring campaigns for industrial companies and have an extensive fleet of sampling equipment at their disposal. This allows us to respond flexibly to projects of varying sizes.
Customers choose Normec because of:
- ISO 17025-accredited analyses
- Working in accordance with recognized WAK procedures
- Modern and reliable sampling equipment
- Experienced field staff
- Complete peace of mind from installation to final report
Thanks to our combination of fieldwork, laboratory analyses, and reporting, you have a single partner for the entire process.
Prepared for future environmental requirements
Regulations regarding wastewater discharges are becoming increasingly comprehensive. Companies must be able to demonstrate that their reports are based on representative and reliable measurement data.
With professional time- and flow-proportional sampling, you have the data needed for compliance, internal monitoring, and future inspections. You also gain better insight into your wastewater streams and potential optimizations within your process. This ensures you’re prepared for today’s requirements and tomorrow’s regulations.
Would you like to learn more about time-proportional and flow-proportional sampling?
Frequently Asked Questions
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In time-proportional sampling, samples are taken at fixed time intervals. In flow-proportional sampling, this is done based on the volume of wastewater discharged.
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An automatically compiled sample provides a representative picture of the wastewater over a longer period, whereas a spot sample is merely a snapshot.
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Many measurement campaigns last 24 hours, but depending on permit requirements or research objectives, longer periods may also be used.
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Yes. The sampling equipment has refrigerated storage to ensure the quality of the samples is maintained.
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The system automatically switches to a new bottle so that sampling can continue uninterrupted.
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This service is primarily used within the industry for permits, operating conditions, wastewater testing, and environmental fees.
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Yes. Normec handles both sampling and analysis, as well as reporting, within a single integrated process.