| AV |
Analysis Valve |
Multi-way analysis valve |
| CAH |
Control/Regulation Alarm High |
Control/regulation limits for the process variable have been
exceeded (beyond the defined limits) |
| CAH |
Control/Regulation Alarm High |
Control/regulation limits for the process variable have been
exceeded (beyond the defined limits) |
| FC |
Flow Controller |
That which has a control output + flow feedback, e.g. the controller
in a Flow controlling PID loop |
| FI |
Flow Indicator |
Can be gauge or digital readout |
| FIC |
Flow Indicating Controller |
As above but with flow indication provided with device |
| FIG |
Flow Indicating Glass/viewing
device |
|
| FIS |
Flow Indicating Switch |
|
| FIT |
Flow Indicating Transmitter |
|
| FQI |
Integrated/Totalized Flow
Indication |
|
| FQR |
Integrated/Totalized Flow
Recorder |
|
| FS |
Flow Switch |
|
| FSH |
Flow Switch High |
Switch is configured specifically to register High Pressure |
| FSHH |
Flow Switch High High |
Switch is configured specifically to register very high
Pressure |
| FT |
Flow Transmitter |
|
| FV |
Flow Valve |
Analogue valve in a PID loop controlling flow |
| GF |
Gas Filter |
G - users choice and F - undefined as passive function - defined
by EP-TA1/Gas to represent Gas Filter |
| HS |
Hand Switch |
Hardwired switch or SCADA control |
| HV |
Hand Valve |
On-Off Valve |
| ISS |
Current Safety Switch |
Residual current detector (e.g. earth leakage fault detector) |
| KA |
Timer/timeout Alarm |
|
| NV |
Non Return Valve |
N - users choice - defined
by EP-TA1/Gas to represent Non return |
| PCV |
Pressure Control Valve |
Valve with Pressure Controlling/regulating/reducing action, self
contained |
| PDCV |
Differential Pressure Control Valve |
Valve with Differential Pressure Controlling/regulating action, self
contained |
| PDT |
Differential Pressure Transmitter |
|
| PSV |
Pressure Safety Valve |
|
| PT |
Pressure Transmitter |
|
| PTY |
Pressure Transmitter Converter |
Electronic interface between Pressure Transmitter and Field Bus
(E.g. Wago I/P module/bus coupler) |
| PUMP |
Pump |
|
| PV |
Pressure Valve |
Analogue valve in a PID loop controlling pressure |
| SCY |
Speed/frequency control
relay/computer/converter |
|
| TAH |
Temperature Alarm High |
|
| TAHH |
Temperature Alarm High High |
|
| TCY |
Temperature Control Relay/Converter |
Interface between Temperature Control Function in PLC and
temperature driver/actuator |
| TE |
Temperature Element |
E.g. PT100 |
| TEY |
Temperature Element Converter |
Electronic interface between Temperature Element and Field Bus (E.g.
Wago I/P module/bus coupler) |
| TKA |
Temperature Rate of Change Alarm |
E.g. heating too slow |
| TSS |
Temperature Safety Switch |
Hardwired temperature activated switch |
| TT |
Temperature Transmitter |
|
| TZ |
Temperature Driver/Actuator |
E.g. Heating Wire |
| UC |
Multivariable/multifunction Controller |
Represents a logical section of a complex control program (usually
within a PLC) |
| XBUB |
Bubbler |
The letter X, being unclassified, denotes that the
mnemonic does
not follow the normal code |
| XMFC |
Mass Flow Controller |
The letter X is unclassified, denoting that the mnemonic
does not
follow the normal code |
| XMFM |
Mass Flow Meter |
As for XMFC above |
| YC |
State Controller |
A control function which initiates a change of state |
| YIC |
State Indicating Controller |
State control is provided as above, but additionally the controller
receives state feedback from the device being controlled. |
| YV |
State Valve |
An on/off valve controlled by a state, event or presence of a
condition (derived from PLC program |
| YY |
State Relay/Converter |
Normally indicates the electro valve which is used as a pilot for a
pneumatic valve |
| ZA |
Position Alarm |
Due to a fault in the position contacts or an intermediate position,
the valve position cannot be determined. |
| ZAH |
Position Alarm High |
Valve still open when instructed to close |
| ZAL |
Position Alarm Low |
Valve still closed when instructed to open |
| ZC |
Position Controller |
Specific Device to Control Valve Position |
| ZCY |
Position Control relay/Converter |
Electronic interface between a software controller and the valve |
| ZSH |
Level Switch High |
A linit switch fitted to a device to indicate it is in the high/open
position |
| ZSL |
Level Switch Low |
A linit switch fitted to a device to indicate it is in the
low/closed position |