Hach EZ Serie Manuel De L'utilisateur page 19

A water connection is also recommended so that the drain sink and drain tubing are regularly flushed
with clean water to prevent blockage by crystallization.
If the analyzer uses flammable reagents, make sure to obey the safety precautions that follow:
• Do not plumb the drain line to a floor drain.
• Dispose of waste in accordance with local, state and national environmental regulations.
5.4.3 Vent line guidelines
Fire hazard. The user is responsible to make sure that sufficient precautions are taken
when the equipment is used with methods that use flammable liquids. Make sure to obey
correct user precautions and safety protocols. This includes, but is not limited to, spill
and leak controls, proper ventilation, no unattended use, and that the instrument is never
left unattended while power is applied.
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,
regional and national regulations.
Do not connect the vent line (exhaust gas port) to other lines because backpressure or damage to
the analyzer can occur. Make sure that the vent line is open to air at the building exterior.
To prevent backpressure and damage to the analyzer, make sure that the analyzer is higher than
the facility vent(s) used and that the vent line has a constant downward slope. Install the vent line
with a 2.54 cm (1 inch) or more vertical decrease for each 0.3 m (1 ft) length of tubing.
The analyzer uses the vent line to release exhaust gases during analysis. Correct installation of the
vent line is important to make sure that all of the gas is removed from the analyzer. Incorrect
installation can cause gas to go back into the analyzer and cause damage. The recommended
external diameter for the header tube of the vent line is 32 mm.
• Make the vent line as short as possible.
• Make sure that the vent line has a constant slope down.
• Make sure that the vent line does not have a sharp bend and is not pinched.
• Make sure that the vent line is closed to the ambient of the installation room and is at zero
pressure.
• Do not block or submerge the vent line.
If the analyzer uses flammable reagents, make sure to obey the safety precautions that follow:
• Do not plumb the vent line to a floor drain.
• Dispose of waste in accordance with local, state and national environmental regulations.
If the analyzer uses ozone, make sure to obey the safety precautions that follow:
• Make sure to plumb the exhaust gas port to the building exterior in accordance with local, regional
and national requirements.
5.4.4 Plumb the analyzer
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local,
regional and national regulations.
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