Drain, Bypass And Exhaust Connections - Hach BioTector B7000i User Manual

5.4.2 Drain, Bypass and Exhaust Connections

WARNING
All BioTector drain tubing must be positioned correctly so that any liquid pumped will drip freely into a larger
drain chamber. The correct positioning and setup of the drain ports prevent liquid accumulation and
measurement errors. All drain ports should be directed to a well ventilated area as oxygen and other gases
may be released during the analysis. The drain tubes should be at atmospheric pressure and should not be
subjected to any back pressure as this may result in measurement errors. The exhaust tube should be piped
out to a well ventilated area as oxygen and other gases will be released during the analysis. The end of this
tube should be positioned in a downward position so that water condensation and freezing will not occur
during winter months. Figure 17 illustrates BioTector drains, sample bypass and exhaust connections.
The PVC-U Drain Pipe, installed outside the BioTector, is supplied for convenience. PVC-U is a durable
material, which survives in environments containing acids, caustics, oxidizing agents etc. However, if the
sample contains specific high concentration solvents such as Benzene, Toluene etc., it is recommended to
check the compatibility of PVC-U tubing against the specific organic solvents present in the sample. If
necessary, the drain pipe can be replaced with an alternative pipe. If such change is carried out, it is
important that the sample bypass port is connected to the new pressure free drain pipe at the same height
with the original pipe.
Figure 17 BioTector drain, sample bypass and exhaust connections
The BioTector should be installed in a well-ventilated area with the exhaust port
piped to an external vent. The installation should be carried out in accordance
with Section 1 Safety Precautions.
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