I would like to know what instruments PY-611A and PY-611B in the diagram are, and what functions they serve
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I would like to know what instruments PY-611A and PY-611B in the diagram are, and what functions they serve
Things like pressure relays, I guess
Next to PY-611A, there is an I/P marked, which stands for electrical converter; it functions similar to a positioner, using electrical signals to control air pressure. There is a P/H mark next to PY-611B; I’m not sure what it means. However, since the lines behind it represent hydraulic signals, it is likely a gas-liquid converter that uses a start signal to control the hydraulic signals. Behind the hydraulic pipeline is a cylinder piston… This should be indicated in the diagram; it’s difficult for those who are not from design firms to understand such specialized instrumentation. It is recommended that the original poster study HG20505-2014 on their own
P stands for pressure, Y as the subsequent letter refers to the converter, H stands for manual, and PY-611A is an electrical converter (I/P)
I completely agree with your view. I refers to the electric current； P:pneumatic pneumatic; H:hydraulic hydraulic
This post was last edited by Ku Liang Zhi Le on 2020-12-30 at 12:29. In the figure, PY-611A and PY-611BP represent pressure, while Y denotes conversion (according to HG/T 20505, Y refers to an auxiliary unit; here it indicates conversion). In the diagram, I/P is marked in the upper right corner of PY-611A, indicating an electric/to pneumatic conversion, while P/H is marked in the upper right corner of PY-611B, indicating a pneumatic/to liquid conversion.
PY-611A is for electrical/gas conversion, while PY-611B is for gas/liquid conversion, serving for signal transmission.
According to the person from the 7th floor, something like this depends on the meaning that the designer assigns to it