Pressure transmitter symbol
Also called PT
A pressure transmitter measures pressure and sends it as a signal to the control system.
What the pressure transmitter symbol means
A pressure transmitter measures pressure and sends it as a signal to the control system.
How it is drawn
A field instrument circle tagged PT, connected to the process, with a signal line to the controller or DCS.
The pressure transmitter symbol in each standard
Drawn as ISA 5.1 defines it, as on most US and international legends.
ISO 10628-2 does not cover instruments. On ISO-based P&IDs they are drawn as IEC 62424 PCE requests, or to ISA 5.1 on many international projects.
German (DIN): Druckmessumformer. See DIN P&ID symbols.
Where you see it on a P&ID
On every pressure loop, alarm and trip.
Tag codes
The pressure transmitter is commonly tagged:
- PT
- PIT
Tag formats follow the project numbering procedure. For instruments, the letters follow ISA 5.1, explained on the instrument symbols page.
Related symbols
Frequently asked questions
What does the pressure transmitter symbol look like on a P&ID?
A field instrument circle tagged PT, connected to the process, with a signal line to the controller or DCS.
What is a pressure transmitter used for?
A pressure transmitter measures pressure and sends it as a signal to the control system. You will find it on every pressure loop, alarm and trip.
What tag does a pressure transmitter have?
It is commonly tagged PT, PIT. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the pressure transmitter symbol the same in ISA and ISO?
ISO 10628-2 does not cover instruments. On ISO-based P&IDs they are drawn as IEC 62424 PCE requests, or to ISA 5.1 on many international projects. Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the pressure transmitter called in German?
Druckmessumformer. On a German R&I-Fließschema it is drawn to DIN EN ISO 10628-2 and DIN EN 62424.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016