Level Plus
®
Tank SLAYER
®
Operation Manual
I
5
I
M
Mass
The property of a body that causes it to have weight in a gravitational
field, calculated by density at the reference temperature multiplied by
the volume correction factor (
Density × VCF
).
MODBUS
A
serial communications protocol
published by Modicon in 1979 for
use with its programmable logic controllers (PLCs). It has become a
de facto standard communications protocol in industry, and is now the
most commonly available means of connecting industrial electronic
devices.
N
NEMA Type 4X
A product
Enclosure
intended for indoor or outdoor use primarily to
provide a degree of protection against corrosion, windblown dust and
rain, splashing water, and hose-directed water; and to be undamaged
by the formation of ice on the enclosure. They are not intended to
provide protection against conditions such as internal condensation or
internal icing.
NPT
U.S. standard
defining tapered pipe threads used to join pipes and
fittings.
NSVP (Net Standard Volume of the Product)
The temperature corrected volume for the product liquid in the tank,
requires the transmitter to be ordered with temperature measurement
capabilities. The
NSVP
is calculated by multiplying the volume of the
product liquid by a volume correction factor based on temperature
(
GOVP × VCF
).
R
Reference Temperature
The
temperature
at which the density measurement is given, the
allowable values are 32 °F to 150 °F (0 °C to 66 °C).
S
Specific Gravity
The
density ratio
of a liquid to the density of water at the same
conditions.
Sphere Radius
The
internal radius
of the sphere that contains the liquid, the value is
used to calculate the volume along with the
Sphere Offset
.
Sphere Offset
An
offset value
that accounts for additional volume in a sphere from
non-uniform sphere geometry, the value is used to calculate the
volume along with the
Sphere Radius
.
Strap Table
A
table of measurement
correlating the height of a vessel to the
volume that is contained at that height. The transmitter can contain up
to 100 points.
T
TEC
‘Thermal Expansion Coefficient’ - a value correlating the change in
temperature for an object with the change in its volume. Allowable
values are 270.0 to 930.0. TEC units are in 10 E-6/Deg F.
Temperature Correction Method
One of five
product correction methods
used to correct the product
volume in the tank due to changes in temperature from 60 °F including
(
6A, 6B, 6C, 6C Mod
, and
Custom Table
.
V
Volume Calculation Mode
One of two methods use to calculate volume measurements from level
measurements, including
Sphere
and
Strap Table
.
VCF (Volume Correction Factor)
A table of measurements correlating temperature points with
correction factors for the liquids expansion/contraction. The
transmitter can contain up to 50 points.
W
Working Capacity
The
maximum volume of liquid
that the user desires for their vessel to
hold, typically 80 % of the vessels maximum volume before overfill.
