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NACB, LLC
8311 Brier Creek Parkway
Suite 105, #257
Raleigh, NC 27617 - USA
919-806-3880 - Phone
919-806-8774 - Fax
sales@nacbvalves.com |
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Liquid Level Gauges
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Glass Level Gauges
Magnetic Level Gauges
Conductivity Electrode Level Gauge
Technical Notes - Level Gauges |
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Glass
Level Gauges |
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Bonetti Liquid Level Gauges are
available in various materials
of construction, both
transparent and reflex glass
designs, as well as magnetic
type for high pressures and
temperatures up to 750�F. We
also supply Bi-color and Boiler
Drum Level gauges.
Click here to view the Catalog (pdf) |
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BONT Reflex Level
Gauges
The liquid level is
distinguished by the different
brightness's of the reflex glass
in the water or in the steam
space. Where there is liquid in
contact with the glass, the
incidental light is refracted to
the inside of the gauge and
absorbed; in the steam space,
the incidental light is
reflected against the glass
grooves and the glass appears
very bright.
Reflex level gauges can be used
in most applications and offer
great advantages in terms of low
initial cost, low operating cost
and easy level reading.
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BONT Transparent Level Gauges
Apart from glass tube level
gauges, transparent level gauges
are always fitted with two plate
transparent glasses between
which the fluid is contained.
The fluid level is indicated as
the result of the different
transparencies of the two medias
and in some cases (for water
steam), by conveying upwards
onto the surface of light
located at the back of the
gauge. The rays are totally
reflected down to the observer.
Transparent level gauges are
suitable for almost all
installations and permit:
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the use of mica shields or
Polytrifluorochloroethylene
shields to protect the glass
from the corrosive action of
the process fluid
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the observation of interface
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the observation of the
liquid color
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BONT Bicolor Level Gauges
The two opposite glasses fitted
into these bicolor level gauges
are not parallel to each other.
By means of a suitable
illuminator into which red and
green screens are fitted the
portion of visible length
occupied by steam appears red,
whereas the portion of visible
length occupied by water appears
green. The level reading is very
easy even at a considerable
distance. The reading of the
bicolor level gauges is not
affected by the blind spaces
between one port-hold and the
successive one.
Bicolor Level Gauges main
application is on high pressure
steam boilers. |
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BONT Bicolor Level Gauges with
Parallel Glasses
It is a variation of the
Transparent Level Gauges,
however equipped with two reflex
glasses and a back illuminator,
fitted with suitable colored
filters. The sharp reading is
given by the contrast between
the bright color (usually red)
of filters in the lower part
containing liquid and the color
of the upper part of visible
window.
These level gauges are
particularly suitable for
liquids that are colorless, very
fluid and non-corrosive for
glasses (e.g. ammoniacal
solutions, trichloroethylene,
water steam up to 32 bar, etc.). |
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Magnetic Level Gauges |
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Click here to view the Catalog (pdf) |
Our magnetic level gauges are manufactured
with the C to C and Visible Length requested
by customers, up to approx. 6,500 mm for
level gauges having a stainless steel
vertical chamber and up to approx. 3,500 mm
for level gauges having a vertical chamber
in synthetic polymers. Longer C to C
distances are manufactures with an
intermediate flanged connection. Normally
the visible length is equal to the Center to
Center distance of the tank connections.
The BONT Magnetic Level Gauges are
manufactured in different types and classes
for various operating conditions. Plant
operating and design conditions must be
clearly indicated to choose a suitable level
gauge. The selection of the level gauge
depends also on the specific gravity
of the vessel liquid.
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The BONT magnetic
level gauge consists of:
- a vertical
chamber of a tube of suitable
diameter and thickness containing a
float wherein a permanent magnet is
placed exactly on the liquid level
line
- two
horizontal stub pipes for connection
to the vessel containing the liquid
of which we wish to know the level
- two stop
valves (recommended, but not
mandatory) one on each stub pipe, to
isolate the level gauge
- an
indicating scale, outside the
vertical chamber, consisting of a
case of non-magnetic material with
transparent front face containing a
set of small permanent magnets
enclosed in small cylinders which
can rotate on their horizontal axis.
These cylinders show an external
surface having two different colors.
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Stainless
Steel for PN 10/40 - 400 |
Synthetic
Polymers |
Stainless
Steel, PTFE Lined |
For
Water/Steam
up to 210 bar
pressure |
Float
Immersed in Vessel |
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| If you want to
use a level gauge for conditions
different from those to which it was
originally supplied, please contact our
Engineering Department by phone at
919-806-3880 or via email at
sales@nacbvalves.com. |
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Conductivity Electrode Level Gauge -
Series RLG |
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Bonetti
electrode type level indicators
RLG series (Resistive Level
Gauge) are made up of three main
components:
- RLG/C
pressure water column
- RLG/E
electronic metering,
monitoring and transmission
unit
- RLG/P
conductivity electrode
The
electronic unit (RLG/E) detects
the presence of either water or
steam around one or more
electrodes (RLP/G) by measuring
the conductivity between the
electrode tips themselves and
the water column metallic wall (RLG/C).
A suitable number of electrodes
are fitted to the column at
different levels. The electronic
unit (RLG/E) measures the water
level within the column (RLG/C)
detecting the number and
position of the wet electrodes (RLG/P).
Bonetti
electrode type level indicators
RLG series are the ultimate
solution to water level
monitoring under high pressure
and high temperature conditions.
They provide high reliability
while providing easy remote
signal transmission. Their
primary application is in steam
boiler drum water level
monitoring and signal
transmission to the control room
in thermoelectric power plants.
The conductivity
sensor probe RLG/P is the heart of the
RLG level indicator. It is made of
stainless steel with a ceramic
insulating element. The hydrostatic
sealing consists of special graphite
gaskets. Each probe is individually
tested, both with helium and
hydrostatically at 420 bar to verify
sealing and function. |
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Click here to view
the
Catalog (pdf) |
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