Sierra InnovaMass 240i Series, Инструкция по эксплуатации, Страница: 100 / 115

100
LCD
Liquid crystal display
M N O P
m
Mass flow rate
mA Milli-amp, one thousandth of an ampere of current

Viscosity, a measure of a fluid’s resistance to shear stress. Honey has high
viscosity, alcohol has low viscosity.
nm3/hr Normal cubic meters per hour (flow rate converted to normal
conditions, as shipped 101 kPa and 0° C). User definable.

P
Permanent pressure loss
P Line pressure (psia or bar absolute)

act
The density of a fluid at the actual temperature and pressure
operating conditions.

std
The density of a fluid at standard conditions (usually 14.7 psia and
20° C).
Permanent
Unrecoverable drop in pressure.
Pressure Loss
Piezoelectric Crystal
A material which generates an electrical charge when the material is
put under stress.
PRTD
An resistance temperature detector (RTD) with platinum as its
element. Used because of high stability.
psia
Pounds per square inch absolute
(equals psig + atmospheric pressure). Atmospheric pressure is
typically 14.696 psi at sea level.
psig
Pounds per square inch gauge.
P
V
Liquid vapor pressure at flowing conditions (psia or bar absolute)
Q R S T
Q Flow rate, usually volumetric.
Rangeability
Highest measurable flow rate divided by the lowest measurable flow
rate.
Reynolds Number (Re) A dimensionless number equal to the density of a fluid
times the velocity of the fluid times the diameter of the fluid channel,
divided by the fluid viscosity (i.e., Re =

VD/

). The Reynolds number
is an important number for vortex flow meters because it is used to
determine the minimum measurable flow rate. It is the ratio of the
inertial forces to the viscous forces in a flowing fluid.
RTD
Resistance temperature detector, a sensor whose resistance
increases as the temperature rises.