I would like to ask about the specific types of instruments for choosing certain instrument symbols
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I would like to ask the experts here: how exactly should I choose the instrument types for these 5 instrument symbols in the PID diagram – two for temperature and three for pressure? Could you please provide more detailed information on what type or types of instruments each symbol represents?
If this question is answered, a 10-yuan WeChat red envelope will be sent as a thank you
No red envelope is needed; just take larger screenshots of the images, and the engineering firms and design companies can help you out. It’s basically a pressure transmitter (probably a 3051 transmitter combined with a 1199 pressure sensor), while TT refers to an integrated temperature transmitter. Your PID diagram isn’t very well formatted; the specific installation method depends on factors such as the medium used, temperature, and measures to prevent freezing in winter. Let's do it step by step.
You can take a look at this; check this table
Are they the drawings made in your own factory?\ud83d\ude02
This is not for selection; it explains what type of instrument it is and what functions it has in DCS. The selection of instruments should be determined based on the environment in which they will be used. For example: parameters such as pressure, temperature, medium, and installation environment are determined.
Graphic symbols indicate functional requirements; the selection of instruments should be based on specific measurement requirements, the properties of the medium, and the conditions at the installation site. These are two questions.
The pressure is determined by selecting an intelligent transmitter based on the range and properties of the material, as well as the material characteristics of the liquid-contacting surface. Since they are all reaction vessels, a PT100 sensor will suffice; just verify its accuracy and range. Encapsulated thermoresistor. Then there’s wiring configuration and debugging
Your diagram has nothing to do with the selection process; for example, the first PICSA is meant for pressure indication, control, interlock, and alarm functions. Moreover, what you’ve drawn in this diagram is incorrect as well. The ones with interlocks are diamond-shaped. It is best to have a specification sheet for selection; if none is available, it is necessary to work with the process team to determine the properties of the medium and the measurement environment. Since the measurement environment and the properties of the medium vary, the choice of suitable component will also differ. Additionally, when it comes to temperature transmission, it is important to consider the temperature level in order to select the appropriate temperature sensing element. It is also necessary to consider whether it is a temperature variation, or whether direct resistance or thermocouple signals are sent to the control room; whether there are modules for TC or RTD signals on the DCS side, and issues such as cold junction compensation.
P Pressure I Indication (Remote) C Regulation S Interlock A Alarm
What you need to do here is choose either a pressure transmitter or a thermal resistor (thermocouple) to transmit the data to the DCS system for display, alarm purposes, and to enable interlock control – usually used for controlling valves and similar devices. As for the selection of pressure transmitters and primary temperature instruments, it depends on the process conditions.