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Level Measurement
The MCG 1500SFI utilizes a bidirectional
servo motor to actuate the
entire level detecting system. The
servo motor is controlled by an on
board microprocessor which
monitors the input of a precision strain
gauge sensor. The input from the
strain gauge represents the strain
applied to the shaft of the servo by
the displacer. The strain is different
for a displacer in the air and in the
product. Based on the strain, the
microprocessor computes the speed
at which to drive the stepper motor
up or down, until product level is
detected.
The exact product level is determined
by an optic encoder which utilizes
infrared LED detectors and emitters
for position sensing and digital
encoding.
Bottom Sediment & Water Measurement
For the gauging of BS&W, the weight
of the displacer at the product/BS&W
interface is calculated and used for
measurements. The displacer is then
driven up or down by the
microprocessor until the interface is
found.
Temperature Measurement
Product temperature is obtained by
using a 3-wire R.T.D. (copper or
platinum) which is connected to an onboard
analog-to-digital converter. The
MCG 1500SFI also allows for
temperature acquisition by providing
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inputs for single point or averaging
temperature probes.
Density Measurement
Density measured by the gauge
relies on two reference numbers: the
weight of the displacer in air, and the
weight of the displacer in water.
The gauge periodically performs
measurements in the air and product
and compares its result to the values
when the gauge was calibrated. A
new density is displayed based on
changes in the weight measurement.
Advanced Technology in the
Palm of Your Hand
They say that “good things come in
small packages.” This is certainly
true of the MCG 1500SFI- the most
compact servo gauge available today.
The 1500SFI stands at a mere 11.25”
high, with a weight of only 25 lbs
(standard housing). Even with all of
the features which have been
incorporated into the 1500SFI, overall
size remained a functional consideration
in the engineering process.
The new lightweight design
eliminates the need for large cranes
or heavy equipment when installing
or removing the MCG 1500SFI.
Quality Parts Make the
Difference
There are many unique elements
incorporated into the design of the
MCG 1500SFI which make it very
different from “conventional” servo
gauges. The MCG 1500SFI uses
patented strain gauge technology to
measure displacement. This results
in greater accuracy and sensitivity.
Similarly, accuracy is increased
through the use of stronger magnetic
coupling. A stepper motor is also
utilized rather than a conventional
motor. The stepper provides for more
precise positioning of the displacer.
Quality parts in conjunction with
quality engineering make the
difference.
Brushless Design
Eliminates Moving Parts
To ensure precise gauge
measurement, highly accurate
weight measurement is essential.
The process by which weight is
measured within servo technology
involves not only the precision of the
instrument (strain gauge), but the
coupling of its signal.
To achieve the coupling,
“conventional” servo technology
utilizes a brush design. The use of
brushes in the process presents the
inherent problem of friction and wear
on the contacts.
L&J’s advanced engineering has
developed a method by which a
unique arrangement of coils
(mounted and static) provide a
transformer for electrically coupling
the signal and power. This brushless
design gives you increased accuracy
with added reliability.
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