Online Process Viscometer (Fuel Oil Application)0 pages

BAGGI BA-VSC
Online Process Viscometer
(Fuel Oil Application)
The BAGGI BA-VSC is part of the BAGGI BASE®
Instruments Series. They are the result of combining
the latest
state-of-thearttechnology
with over 50
years of
industry
experience.
The BA-VSC
is an online
process
viscometer for
continuous,
reliable and
accurate
measurement
s. It has been specifically designed for fuel oil
monitoring in an explosive atmosphere (ATEX)
environment. Combustion efficiency and emissions
are directly impacted by the fuel characteristics and
how it is atomized. Heavy fuel oil is a special
challenge. It is the leastrefined thus the least
expensive oil.
Unfortunately, it also has
the most variation,
depending on the
characteristics of the oil
field it was from and how it
was processed. Therefore
the fuel viscosity must be
tightly controlled in order
to control fuel atomization,
and thus burn efficiency
and emissions.
The instrument is flexible,
being software driven and
controlled by an easy- to-use menu. It is able to
measure, display, transmit remotely and archive the
following quantities:
• Viscosity
• Temperature
• Temperature-compensated viscosity
• Density (optional)
TDSCS00129DR0_BAVSC

The sensor technology uses only one moving part, a
piston, driven electromagnetically through the fluid in
a small measurement cell. A deflector, positioned
over the piston, moves the fluid into the measurement
cell, while two coils move the piston back and forth at
a constant force. The relevant circuitry analyzes its
two-way travel time to measure absolute viscosity. All
wetted parts are stainless steel and the piston is in
constant motion, so the sampling area is continually
scrubbed clean; there is no need for frequent
calibration. The measurement capability has a range
from 0.2 to 20,000 cp. In addition, each viscometer
includes a built-in temperature detector that senses
the actual temperature in the measurement cell in
order to determine a temperature-compensated
viscosity (TCV). Please refer to the figure on the left.
As outlined, the BA-VSC is a complete solution built
to operate in a potentially explosive atmosphere, due
to the possible presence of gas. The ATEX protection
is achieved by the pressurized enclosure method.
That is, all the devices that could be ignition sources
are isolated within a pressurized enclosure filled with
a protective gas (air or nitrogen).
The electrical signals and power are interconnected
externally by means of appropriate junction boxes.
The related marking is typically the following:
II 3 G Ex pz IIB T3 IP66
Due to the physical characteristics of fuel oil, the BAVSC is also in charge of heating the relevant pipes.
Typically, the oil temperature is kept constant at 100
° within the system. Of course, care is taken to
C
maintain the electronic components at their correct
working temperature. The cabinet containing the
electronics is pressurized by instrument air, while the
one containing the heat exchanger is pressurized by
nitrogen.
Summarizing, the system comes into AISI 316L SS
pressurized cabinets, linked together, and is
composed by the functional blocks listed hereafter:

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B.A.G.G.I . SrL – V.le Campania,29 20133 Milano Italy – Tel. +39 02715547 – Fax +39 027490571 – baggi@baggi.com