Emerson Vilter VSS Installation, Operation & Maintenance Manual page 22

Section 1 • General Information
PDIT Pressure Differential
Indicating Transmitter
PDSH Pressure Differential
Switch High
PDSHH Pressure Differential
Switch High High
(Shutdown)
PDSL Pressure Differential
Switch Low
PDSLL Pressure Differential
Switch Low Low
(Shutdown)
PDT Differential Pressure
Transmitter (Blind)
PDV Pressure Differential
Control Valve (Pneumatic
Actuator)
PFY Pressure Ratio Convertor/
Relay
PFC Pressure Ratio Controller
PG Pressure Gauge
PI Pressure Indication (Soft)
PIC Pressure Indicating
Controller
PIT Pressure Indicating
Transmitter
PSE Pressure Rupture Disk
PSH Pressure Switch High
PSHH Pressure Switch High High
(Shutdown)
PSL Pressure Switch Low
PSLL Pressure Switch Low Low
(Shutdown)
PSV Pressure Safety Relief
Valve
PT Pressure Transmitter
(Blind)
PV Pressure Control Valve
Q Quantity and Heat
QE Heater Element,
Immersion, Tracing
R Radiation
S Speed, Frequency
SC Speed Control
SD Shutdown
1 – 8
SIC Speed Indicating
Controller
T Temperature
TC Temperature Controller
TAH Temperature High
TAHH Temperature High High
(Shutdown)
TAL Temperature Low
TALL Temperature Low Low
(Shutdown)
TE Temperature Element
(RTD, Thermocouple,
etc.)
TG Temperature Gauge
TI Temperature Indication
(Soft)
TIC Temperature Indicating
Controller
TIT Temperature Indicating
Transmitter
TRV Transfer Valve 3-Way
TSH Temperature Switch High
TSHH Temperature Switch High
High (Shutdown)
TTSL Temperature Switch Low
TSLL Temperature Switch Low
Low (Shutdown)
TT Temperature Transmitter
(Blind)
TV Temperature Control
Valve
TW Temperature Thermowell
TY Temperature/Relay/
Convertor
U Multi Variable
V Vibration, Mechanical
Analysis
VE Vibration Probe
VFD Variable Frequency Drive
VG Block/Bleed, Gauge Valve
VSH Vibration Switch High
VSHH Vibration Switch High
High (Shutdown)
VT Vibration Transmitter
(Blind)
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
VU Vibration Monitoring
System
W Weight
XA Status (Stopping/Not
Running) Alarm/Common
Alarm
XC State Controller
XI Running Indication
XV Solenoid Valve
XY State Relay/Convertor
Y Event, State, Presence
YAH Fire Alarm
YE Fire Detecting Sensor
YIT Fire Indicate and Transmit
YK Fire Control Station
Z Position, Dimension
ZC Position Controller
ZE Position Element
ZI Position Indicator
ZIT Position Indicating
Transmitter
ZT Position Transmitter
(Blind)
ZY Position Transmitter
(Blind)
ZZ Position Actuator
(Capacity or Volume)