7088-8000
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GLOSSARY
This appendix provides a glossary of terms that may be useful when using the DCT-7088.
Accuracy
The ability of a flowmeter to produce an output within a
specific tolerance (in comparison to a known standard)
which corresponds to its characteristic curve. Refer to
Linearity.
Alarms
Flow condition indicators which register on the optional
printer. There are four separately programmable alarms
available on the DCT-7088 (Section 3.6.11).
Calibration
The procedure which prepares an instrument to operate
within its specifications.
Clean fluid
A fluid with few suspended particles or bubbles, such as
distilled water, solvents, and fuels.
Damping
The slowing of instantaneous signal changes to provide a
more gradual or smoother response to the process
measurement. Damping is configured by the user.
DCT
The Digital Correlation Transit time series of Polysonics
flowmeters.
Dirty fluid
A fluid containing suspended solids, contaminants,
particles, or bubbles.
Flow profile
Also called velocity profile. A side-view graphical
representation of the distribution of flow velocities in a
pipe. Flow profile is comprised of the shape of the layers
of individual local velocities inside a pipe. Factors that
determine the flow profile include the inertial and viscous
forces of the fluid, inside pipe roughness, line restrictions,
fittings, etc.
Full scale flow rate
The highest flow rate that can be measured by the
flowmeter with its current settings. The full scale flow
rate is dependent upon the setting of the maximum flow
range and the pipe inside diameter (ID).
Ingress protection (IP)
An international rating system for electrical equipment
enclosures. Indicates the degree of protection from
penetration of solid and liquid objects. The DCT-7088
meets IP67, which allows brief total immersion with the
lid closed to depths to 1 meter.
Inside roughness
Roughness on the inside pipe wall or liner surface,
expressed in feet.
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