
P a g e 7 4 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 7 5
LP — liquefied petroleum
LTS humidifier — Liquid-to-Steam humidifier
M
mA — milliampere
max — maximum
MB — megabyte
mb — millibar
MBh — one thousand Btu per hour
micromho — one-millionth of a mho. The micromho is the
practical unit of measurement for conductivity, and is used to
approximate the total dissolved solids content of water. The
preferred term for conductivity is µS/cm
microSiemens/cm — microSiemens per centimeter (abbreviated
µS/cm); a measure of conductance; see also micromho
N
NEMA — National Electrical Manufacturing Association
NIST — National Institute of Standards and Technology
No. — number
NOx — nitrogen oxide
NPT — National Pipe Thread
O
oc — on center
OD — outside diameter
P
PID — proportional, integral, derivative
ppm — parts per million
psi — pounds per square inch
PVC — polyvinyl chloride
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