Hach A1000 Manuel D'utilisation De Base page 19

Figure 17 Plumb the sample tubing
Install an isolation valve
Install an upstream isolation valve near the analyzer so the sample flow
to the analyzer can be controlled manually. The isolation valve is
supplied by the user.
Exception: For the A1000XP analyzer, the manufacturer recommends
that no isolation valve be installed in the sample line to minimize the
potential for contamination. If an isolation valve is necessary, clean the
isolation valve thoroughly of all lubrication and other debris before
installation.
1. Open and close the isolation valve several times before it is
connected to the analyzer to flush debris from the system.
2. Use the supplied ¼-in. tube x ¼-in. MNPT compression fitting as
necessary to connect the isolation valve to the analyzer. Refer to
Figure 18.
English 19