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PSA S665S200 Stream Selection Unit User Manual

The PSA S665S200 Stream Selection Unit range is utilised when numerous sample streams need to be monitored. The unit consists of an appropriate number of 3-way Teflon switching valves for the number of sample streams to be monitored.
In some configurations, the system can also be used to deliver blank and calibration gas to a desired location to perform system bias testing.
In standby mode all sample streams flow to waste and the valves are non-energised. (In natural gas applications the wastes are capped and there is no sample flow in standby.) Valves are activated using the TTL lines from the PSA 10.525 Sir Galahad. When a stream has been selected the corresponding valve is energised using 12V dc. Once energised the valve is kept open using a holding voltage of approximately 4.5 V dc. The valve will be activated for the entire analytical cycle. Switching the valve will direct the sample flow through the manifold out to the Sir Galahad collection tube and, in stack gas type stream selection units, to the excess flow port.

Calibration Gas Inlets: Blank in corresponds to the blank gas from the Cavkit. Calibration Gas in should be connected to the high span gas from the Cavkit.

Calibration Gas Outlets: These should be connected to appropriate points in the sampling stream(s). Blank and high span are selected using the internal valve arrangement.

Table 8 S665S200/P310 Channel Allocation

Channel Valves Selected Valve No.
Function Cal Gas Sample

1 --- Hg0 1 SAMPLE
2 --- HgT 2 SAMPLE

3 Blank --- 9 None
4 Span --- 10 None
5 Blank Hg0 1+9 Hg0 blank check
6 Span Hg0 1+10 Hg0 span check
7 Blank HgT 2+9 HgT blank check
8 Span HgT 2+10 HgT span check others --- --- Closedown etc

S665S200/P200: Two x two sample streams, two cal. gas delivery streams
This unit is normally used for selecting between Hg0 and Hgtotal from two different sampling locations (e.g. inlet and outlet of a control device). Four additional valves are used to supply blank and high span to the two sampling locations.

S665S200/P710: Two sample streams, two cal. gas delivery streams
This unit is normally used for selecting between two streams (e.g. Hg0 and Hgtotal) from one sampling location and to supply blank and high span to two different locations in the sampling stream (e.g. to the probe and to the local sample conditioning system).

S665S200/P320 + E100: two x two sample streams, three cal gas delivery streams
This unit is normally used for selecting between Hg0 and Hgtotal from two different sampling locations (e.g. inlet and outlet of a control device). Three additional pairs of valves are used to supply blank and high span to each sampling location and a local calibration channel.