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Multi-Stream Systems
Multi-stream systems are used as an alternative of installing more then one analyser. It can be a less expensive solution. A second reason could be that it is important to analyse differential. For example; measure the contamination of a cooling water stream by first analysing first the intake cooling water and then the discharge cooling water.
ODS is experienced in designing and building stream selectors. Important installation features are:
- All sample lines and all wetted parts should continuously being flushed (adsorption and memory effects);
- No dead volumes are allowed in the sample sequencer (stream selector). Use of 3-way valves, a manifold with a small volume and a common drain line is a must.
- Select an analyser with a fast response time. The response time of the analyser system per stream is: Strn (streams) x Analyser Response Time (minutes). Typical: 4, 8, 12, 16, 20, 24, 28 minutes for 1, 2, 3, 4, 5, 6, 7 streams.
- Be aware of carry over effects. The selection of the correct analyser is very important. Average levels of the different streams should be more or less in the same range;
- Consider the importance of the analytical data. If the analyser is out of operation, the data of several streams will be lost. A second redundant analyser system could be advisable.
- Find the correct balance between response time, sample line length, levels/ranges, availability of critical data, etc.
- The stream selector can be controlled by an automatic sequencer or by the factory DCS itself. Via the DSC there is the flexibility to control channels in a specific free selectable order or even combine streams to one measurement (to save time during/after an event).
- Etc.
We are pleased to offer you specific information:
Contact ODS and/or Send us your enquiry
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