AlmostRetired,
Thank you for your detailed explanation.
Can I interpret it by that If a digital signal form a mechanical float switch on/off in P&ID, it just only a LSH not need LE symbol?
In the other hand, LE and LSH that is a sensor to give a analog signal so it have two symbol.
I have...
Dear all,
I‘m a new technician in a plant, some time i need to real P&ID to find out the sensor or valve, but lot of symbol i don’t understand and i have tried to search form google.but it failed.
Have any P&ID test book for a new? [tiphat]