KROHNE BW 25 Specifications
GR/PRINTO
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KROHNE 09/2001 7.02368.21.00
Liquid level indicator
BW 25
Status: 10/99
152
Liquid level indicator
BW 25
Level measurement of liquids, even at high
pressures using the displacement principle
Operating principle
The BW 25 liquid level indicator operates
on the displacement principle.
The length of the displacement rod corresponds to the measuring range.
A displacement body suspended on a
measuring spring is immersed in the liquid
and is subjected to an upthrust based on
Archimedes’ principle, this being proportional
to the mass of the liquid displaced. Every
change in the weight of the rod corresponds
to a certain change in the length of the
spring, and is therefore an indication of the
liquid level. Extension of the spring is transmitted by magnetic coupling from the measuring zone to an indicator. This transmission
method permits pressure-tight separation of
the measuring spring system and the scale.
Modular assembly,
replacement or
retrofit without
interruption of the
process
Pressure-tight
separation of
measuring
and display
parts
Interface
detection
possible
Displacement rod
available 0.3 – 6 m
(1 – 20 ft)
Resistant to high
pressures ≤ 700 bar
(10000 psig) and
high temperature
≤ 400°C (752°F)
;
;
;
;
;
Scale division
showing
… full tank
… level x
… empty tank
Height setting
for
… full tank
… level x
… empty tank
Level
F
G
F
A
FA = Buoyancy
F
G
= Weight
;
;
;
;
;
Product
Overview
Ultrasonic
Buoyancy
Capacitance
Ultrasonic RadarUltrasonic Buoyancy TDR
Continuous, non-contact
Switches
Vibration
Continuous, contact
BW 25 153
BW 25
Application range
The limit switch can be used for various materials.
This device is suitable for extreme ambient conditions.
Temperatures –60 … +400°C (–76 … +752°F)
Pressure Up to 700 bar (10 000 psig)
If the display cannot be installed from above, e.g. there is an agitator
in the container, it is possible to install it lateral with the special reference chamber.
In both cases it is important to note that the non-measurable depth
is 340 mm because of the spring mounting.
Modularity
The M9 indicator is of modular design.
This offers the following advantages:
● Electrical functions can be retrofitted
● Installation without interrupting the process
● No re-calibration necessary
● Easy and quick to replace through plug-in-technology
Product Ammonia
Pressure 450 bar (6525 psig)
Temperature 70°C (158°F)
Measuring range 1500 mm (4.9 ft)
With special versions it is possible to measure the level of the interface between two immiscible liquids of different densities. The displace rod
must be covered completely with liquid. The difference in density should be min. 100 g/l.
≤ 340 mm
Typical products are:
● Water, aqueous liquids
● Acids/alkalis
● Organic and inorganic solvents
Typical application in the chemical industry
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