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Appendix B Glossary Series 220/221 Instruction Manual
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
user’s pipeline.
Joule A unit of energy equal to one watt for one second.
Also 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.
∆
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).
B-2 IM-22