How to determine the number of letter columns on an instrument’s logo
Thread Content
For some initial letters, it’s unclear which column the following letter belongs to; when seeing one such letter in the table with multiple possible meanings, it’s not clear which one to choose
For example, S has security. Switch. The meaning of “stop”; sometimes it’s not clear what comes after it
It depends on the position of the letters in the designation; for example, in PIAS-2011, ‘P’ stands for pressure, ‘I’ for indication, ‘A’ for alarm, and ‘S’ for interlock. The specific meaning depends on what function is to be carried out through control.
Tell the person upstairs to determine whether the function of the circuit is LI, LIA, LIAS, etc., by referring to the control and interlock requirements of the process
It’s actually a very simple thing – just add the first letter to the following letter. I don’t know who created this table; just by changing the number of columns, it confused the original poster.
For example, if A is in the first position it means analysis, while in subsequent letter positions it means alarm
For this, you need to look at the flowchart. This is the most basic instrument design; if you don’t understand this, then... . .