MTS Systems Level Plus Interface Manual page 5

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 fac-
to 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 allow-
able 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 condi-
tions.
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 tem-
perature 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.
5
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HART Interface Manual
LP Series