Sierra INNOVA-MASS 241-VTP - Manual (Page 72)

Appendix B Glossary Series 24-HP Instruction Manual
B-2 IM-24-HP
I J K L
In-Line Flow Meter A flow meter which includes a short section of piping
which is put in-line with the user’s piping.
Insertion Flow Meter
A flow meter which is inserted into a hole in the us-
er’s pipeline.
Joule
A unit of energy equal to one watt for one second. Al-
so equal to a Newton-meter.
LCD
Liquid crystal display.
M N O P
m Mass flow rate.
mA Milli-amp, one thousandth of an ampere of current.
μ
Viscosity, a measure of a fluid’s resistance to shear stress.
Honey has high viscosity, alcohol has low viscosity.
Δ
P Permanent pressure loss.
P Line pressure (psia or bar absolute).
ρ
act
The density of a fluid at the actual temperature and
pressure operating conditions.
ρ
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 plati-
num 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).