The differences among these three DCS instruments
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This post was last edited by Little Worker on 2017-2-22 at 22:22. As shown in the image, all three are DCSs – what are the differences between them? It would be helpful to have examples to illustrate this. In my experience, the second type is the one used for connecting to DCSs; I wonder if everyone is unaware of these differences, which is why they all use the second type
Refer to standard ISA-S5.3: 1. Not accessible to the operator under normal conditions; 2. Accessible to the operator under normal conditions; 3. Auxiliary operator interface device
Installation location of DCS instruments: 1. On-site installation； 2. Installation in the control room ； 3. On-site panel mounting.
Installation location of DCS instruments: 1. On-site installation； 2. Installation in the control room ； 3. On-site panel mounting.
Take a look at the functional indicators and graphic symbols for process measurement and control instruments in HG/T 20505-2014
They all go into the DCS system and are displayed on the central control panel, right?
It was screenshots taken based on that standard
I can’t see your image; I’ve tried several times with no success
These three diagrams use a pressure control system as an example; 1. is the pressure transmitter installed on-site； 2. These are the pressure values displayed on the DCS host computer, as well as the pressure controllers, etc. 3. The gauge that shows the output of the pressure transmitter is installed on the gauge panel at the site. The specific details will be indicated in the diagram. Such as tag numbers, functions, etc.