Brothers, is that representation in the drawing correct?

Why are level and weighing **SA, while pressure is PIAS? What’s the reason? Or are both of these ways of expressing it correct?

Of course, LIAS is more accurate – first trigger alarm A, then activate interlock S

Figure 1: According to industry conventions, it should be ‘LISA’, as earlier standards included a rule specifying the order of subsequent letters; later and current standards no longer have this rule, but the convention has already taken hold in the industry. Figure 2: When deciding whether to use a temperature sensor (thermocouple or thermistor) or a temperature transmitter, the main consideration is the signal matching issue between the circuit board and the measurement section. If the DCS is equipped with a thermocouple/thermistor input card, use the corresponding temperature sensor; if the DCS has numerous 4–20mA input channels, a temperature transmitter can also be considered ； In addition, considerations must be given to the installation site of temperature sensors/transmitters, as well as issues such as cable laying and on-site installation conditions.

The relevant specifications do not require a specific order, so either one is acceptable; it’s entirely up to personal preference. However, I prefer LIAS, as it’s easy to understand: call the police first and then proceed with the subsequent steps. Additionally, in the current specifications, the functions of TE and TT can be omitted.

Why are PE markings rarely seen on pressure sensing elements?