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Maintenance
DANGER
Depressurize the system before carrying out any work on the Bypass Level Indicator (BNA)!
DANGER
Maintenance must not be performed in a potentially explosive atmosphere.
If the liquid to be measured contains dirt particles which may deposit in the bottom part of the BNA:
Determine the necessary time interval for cleaning.
NOTE
Coated Bypass Level Indicators must be checked regularly - at least every 12 months - for
damage to the coating.
Cleaning
Open the drain plug (1/14) or drain valve. Wash out the deposits.
If there are any encrustations, remove the top and bottom flange (dependent on the model).
Carefully remove the float.
Clean the BNA mechanically.
Check all flanges, discharge tubes and vent plugs for firm seat and tightness at regular
intervals.
Check the gaskets carefully. Replace graphite gaskets immediately when damaged.
NOTE
The orderer must ensure that the inspection intervals required for his plant are observed.
Indicators provided with a heating jacket covering the inner weld seams must be subjected to a
pressure chamber leak test at intervals to be specified by the operator. This is to recognize
corrosion-conditioned leaks of a weld seam exposed to the process medium, and to prevent that
process medium from entering the heating circuit.
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Technical Data
BNA 21/22
Tube and flange material
Float material
1.4571 or titanium
Media temperature range
Max. -40°C...+ 150°C
(ex area according to ATEX
Process connection
G1/2"
Maximum permissible
pressure
Refer to data sheets for further technical data, dimensions and options
Nameplate
For ex equipment (example)
.
BNA 31/36
BNA 41/42
1.4571
1.4571 or titanium
Max. -40°C...+ 320°C
(ex area according to ATEX
see certificate)
see certificate)
on the
G1/2"
on the
G1/2"
on the
side
side
side
PN 16
PN 40
BNA 45/46
G1/2"
on the
side
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