Difference between the variable under measurement/trigger variable letter/directly measured variable
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This post was last edited by qq_Zhi Pang 683683 on 2018-3-30 at 14:12. I’m having trouble distinguishing these three concepts related to standard scores; please give some guidance
The variable under measurement is a process parameter that can be measured, such as liquid level, pressure, temperature, etc； A triggering variable is a quantity that causes a change, such as a valve position switch or a level switch.
Upon closer inspection: 1. The “initial letter” can be either just the letter of the variable being tested/triggered, or it can be the letter of that variable along with any modifying letters. The variable you mentioned, the one that triggers changes, is a quantity that causes variations, such as valve position switches, level switches, etc.; the letters defining these switches are not capitalized. The switch seems to be
Damn, it’s written in bird language, right? Bro, I can’t understand it~~~~~
Listing the source (original text) may help with understanding. Measured/Initiating Variable: 11 are directly measured variables. These should be considered as the measured/initiating variables in the circuit numbering, including but not limited to: (a) difference (D), pressure drop (PD), or temperature difference (TD); (b) accumulation (CQ), flow accumulator (FQ), for example when a volumetric flow meter is used directly; (c) x-axis (X), y-axis (Y), z-axis (Z), vibration (VX), (VY), (VZ), stress (WX), (WY), (WZ), or position (ZX), (ZY), (ZZ). Numeration shall include but are not limited to: (a) Differential — pressure or temperature. (b) Total — flow totalizer, when directly measured, such as by a positive displacement flowmeter. (c) X-a*s, y-a*s, or z-a*s, or vibration, force, or position
The triggering variable is not a switch; it is the quantity that causes the change. A quantity that is typically measured solely to obtain a process indication signal is called a measured variable ； The quantity that is used for control adjustments based on the acquired signals is called the Initiating Variable; essentially, signals are obtained through measurement.
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