A simple overview of any sampling system will have the following considerations.
A Sampling system will consist of all the equipment required to present the Analyser with a conditioned, clean representative sample of the process stream and then to dispose of that sample.
When the analyser is part of an automatic control loop, the reliability of the Sampling system is as important as the reliability of the Analyser or the Control equipment.
Sampling systems have several functions. The sample must be:
- Withdrawn from the process
- Transported
- Correctly conditioned
- Introduced into the analyser
- Disposed of
Probably the most common problem in Sample-system design is the lack of realistic information concerning the properties of the process material at the sampling point.
Typical Sample Conditioning for a Boiler Steam and Water Sampling System (SWAS)
Waste Water Effluent and Water Treatment Plants also have a number of Analysis points that require careful consideration of the sample conditioning and analysis. Environmental legislation also has to be considered to ensure that an approved method of measurement is applied to the application e.g MCertified product selection.