Low-Pressure Flow-Cell Kits - Hach 2100N Instruction Manual

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SECTION 5,
continued

5.2 Low-Pressure Flow-Cell Kits

Figure 10 Low-Pressure Flow Cell Assembly
* U.S. Patents 5475486 and D358448.
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The Low-Pressure Flow-Cell systems (manual or automated kits) use an
innovative sample cell design* with a baffled inlet and dual outlets that minimize
accumulation of entrapped air bubbles and heavy solid particles in the cell
(see Figure 10). The glass cell is threaded on both ends to accommodate plastic
end caps. The cell has an approximate volume of 22 mL when assembled. The
parts disassemble easily for thorough cleaning.
Sample is introduced into the top of the cell. A baffle deflects the incoming
sample to the side wall of the cell minimizing turbulence in the light path.
Sample is discharged from top and bottom outlets. The top outlet collects and
expels air bubbles and particles that tend to float. The cone-shaped bottom outlet
collects settleable solids; water discharged from the bottom outlet carries the
settled solids out of the cell. This novel, dual-outlet design eliminates dead
volume in the cell to provide rapid, thorough flushing of the cell from one sample
to the next.
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