Siemens ULTRAMAT 23 - Page 236

List of abbreviations
C.1 List of abbreviations
ULTRAMAT 23
236 Manual, 3/2016, A5E37100388-003
Abbreviation/symbol
Description
PC
Personal Computer, a stationary single-user computer
PCS
P
rocess
C
ontrol
S
ystem
PDM
Process Device Manager, software for operating devices
PE
P
oly
e
thylene, a plastic
PE
Protective Earth (conductor)
PI
PROFIBUS International
ppm
parts per million (≙ 10
-6
)
PROFIBUS
Process Field Bus
psi
pounds per square inch; 1 psi ≈ 69 hPa
PTB
Physikalisch-Technische Bundesanstalt (German technical inspectorate)
PTFE
Polytetrafluoroethylene, a plastic, tradename e.g. Teflon
PVDF
Polyvinylidenefluoride, a plastic, tradename e.g. Kynar
QAL
Quality Assurance Level
R22
Common name for chlorodifluoromethane, CHClF
2
RAM
Random Access Memory
rel.
relative
RH
Relative Humidity
ROM
Read Only Memory
RS
Recommended Standard
RS 232 (also EIA-232) Identifies an interface standard for a sequential, serial data
transmission
RS 485 (also EIA-485) Identifies an interface standard for a differential, serial data
transmission
s
Second(s)
s. Refer to
SELV
Safety Extra Low Voltage
SF
6
SF
6
= sulfur hexafluoride
SIPROM GA
Siemens Process Maintenance for Gas Analyzers
SO
2
SO
2
= sulfur dioxide
SW
Software
t
time
T
Temperature
TA Luft
Technical Instructions on Air Quality Control (Germany)
TCP/IP
T
ransmission
C
ontrol
P
rotocol/
I
nternet
P
rotocol; a reference model for Inter-
net communication
TÜV
Technischer Überwachungsverein, German Technical Inspectorate
U
Symbol for electric voltage
LEL
Lower Explosion Limit
USB
Universal Serial Bus
UV
Ultraviolet
V
Volt
V.
Version
VA
Voltampere