WIKA BNA - Handbuch (Seite 8)

GB
8 WIKA operating instructions bypass level indicator model BNA
112195.01 11/2012 GB/D
3. Installation and commissioning
The bypass level indicator is mounted in a vertical position on the vessel
to be monitored using the process connections (1) provided. Seals
(2), screws (3), washers (4) and nuts (5) suitable for the process
connection must be used. Choose a seal with a suitable corrosion
resistance. If necessary, shut-off valves must be mounted between the
vessel and the bypass.
Please heed the usual torque values of screws used in
pipefitting work. The bypass level indicator must be installed
without tension. Suitable seals must be used. Care must
be taken that the seal material is resistant to the medium
and its vapours as well as to the temperature and pressure
loads to be expected.
Installing the float
■ Clean the float of anything stuck on it in the area of the float magnet
system
■ Remove the base flange (7) and insert the float (6) into the tube
from the bottom (the marking "top" or a legible model code marks the
top side of the float)
■ Place the seal (9) onto the base flange. Replace the base flange
and fix it in place using the screws (8)
Commissioning
If the bypass level indicator is fitted with shut-off valves between
process connections and tank, proceed as follows.
■ Close draining and bleeding fittings on the bypass level indicator
with Plexiglass attachments, the float must be moved up and down
inside the tube. For magnetic roller displays with flushing connections,
these connections must have an airtight seal. Please refer in this case
to the mounting and operating instructions for WIKA magnetic roller
displays with flushing connections as well.