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Installation and putting into operation of the BNA…EX bypass
level indicator in explosion risk areas
The BNA…EX bypass level indicator is mounted on the container in which the fluid
level is to be monitored by means of the planned process connections (1) in the
vertical position. Use properly fitting gaskets (2), bolts (3), washers (4) and nuts (5) for installation.
Make sure the gaskets used are corrosion-proof as required. Install cutoff fixtures between the
container and the bypass device as required. Comply with the limit values stipulated for the
BNA…EX bypass level indicator for reasons of explosion protection and within the framework of
the intended use of the device and the applicable laws and regulations (proof of inherent safety).
Compliance with any "Special Conditions" stipulated in such laws or regulations is of particular
importance.
Please comply with the maximum
torque ratings of the bolts / screws
used when tightening them down.
Use suitable gaskets. Make sure the
gasket material is resistant to the medium and its
vapours as well as to the expected temperature and
pressure loads.
Installation of float
1. Remove the bottom flange (7) and insert the float
(6) into the tube from the bottom. (See marking
"TOP").
2. Place gasket (9) on the bottom flange. Replace
the bottom flange and tighten it down with bolts
(8).
Attention!
A fall protection device is located at the
bottom and top chamber end (e.g.
flange) consisting of a spring supporting
a PTFE disc. This device serves to cushion a float
impact and prevent metal elements from coming into
contact. Be careful not to damage the fall protection
device when inserting and removing the float.
6
9
1
3
7
2
4
5
8
M
L1
L2
L = Bottom dead leg dependent on S.G. of liquid
Fig. 1
