Sample, Drain And Exhaust Connections; Sample Inlet Tube Position - Hach BioTector B7000 User Manual

5.4

Sample, Drain and Exhaust Connections

5.4.1 Sample Inlet Tube Position

Caution
BioTector operates on unfiltered samples, the setup of the sampling point is important for the correct
operation of the system. BioTector can handle soft particulates up to 2mm in diameter, however hard
particulates (e.g. sand) will damage the analyzer and should be removed from the sample.
The vertical distance between the water surface at the sample intake and the bottom of the BioTector
enclosure can be up to 4 meters. The overall length of the sample tube is typically 4 meters. BioTector in fact
can draw samples from distances greater than 4 meters however, such distances may have an impact on the
Sample Pump tubing life. The point where the sample is taken from should not be pressurized. The sample
inlet and outlet should be at ambient pressure. The sample temperature should be between 2°C and 60°C
(36°F - 140°F). The minimum sample flow rate is 100ml per sample. The sample bypass tube should be
placed to a well ventilated area at ambient pressure and it should not be subjected to any back pressure as
this may result in measurement errors. Figure 16 below illustrates the correct positioning of the BioTector
sample tube in various/optional sampling systems.
Figure 16 BioTector sample tube position in various sampling systems
For the fittings to remain leak proof, they must be kept clean and should not be
over tightened. Over tightening of the fittings will damage them and cause
eventual leakage.
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