WIKA BNA, Руководство по эксплуатации

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EN
001958.03 03/2019 EN/DE
12 Operating instructions bypass level indicator, model BNA
In addition, ensure it has corresponding corrosion resistance.
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 for mounting. If necessary, shut-off valves must
be mounted between the vessel and the bypass.
Installing the float
■
Clean the float of anything stuck on it in the area of the float magnet
system
■
Remove the bottom 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 bottom flange. Replace the bottom flange
and fix it in place using the screws (8)
5.3 Commissioning
If the bypass level indicator is fitted with shut-off valves between process
connections and tank, proceed as follows:
■
Close drain and vent fittings on the bypass level indicator
■
Slowly open the shut-off valve at the upper process connection
■
Slowly open the shut-off valve at the lower process connection
As liquid flows into the bypass chamber, the float rises to the top.
The magnetic system turns the elements of the magnetic display
from “light” to “dark”. The current filling level is shown after liquid
equalisation between the vessel and the bypass level indicator.
■
Always observe the mounting and operating instructions of
accessories before putting them into operation
Bypass level indicator with heating jacket
In this version, the bypass tube is surrounded by a second tube. Heated
liquid or vapour (heat carrier) can flow through this interspace via two
connections. The materials used must be designed for these conditions.
5. Commissioning, operation