What does this symbol in the PID diagram mean?
Thread Content
When measuring temperature and pressure, a needle valve is used for pressure measurement, while another device is used for temperature measurement. What does this diagram mean?
This symbol is not a standard engineering drawing legend symbol. Used in textbooks to represent sensors.
As I understand it, this refers to a temperature transmitter, which transmits a 4–20mA signal to the DCS system or panel-mounted instruments.
Some temperature sensing elements don’t require a transmitter!
TT101 in the diagram refers to on-site transmission
TT must be wrong; it should be changed to TE. I asked my friend.
It’s obviously a mistake in the drawing; the circles and crosses are transmitter legends used in the layout diagram, not those used in the PID diagram
\ud83e\udd23
I think so too; the drawings from small companies have lots of errors!