Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2020-12-07
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Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2020-12-07: Discussion question: 319. There is a differential pressure transmitter with a measurement range of 0–10 kPa. The manual for this instrument specifies that a negative drift of 100% is possible (the maximum drift amount is -100%). What is the maximum drift amount for this instrument? (5 points are given only to those who provide the correct answer; additional points are awarded for a correct calculation process or detailed explanation.)
Is it really necessary to go through the calculation steps for something this simple? -10KPA to 0
-10KPa--0KPa
There is a differential pressure transmitter with a measurement range of 0–10 kPa. The manual for this instrument specifies that a negative drift of 100% is possible (the maximum drift amount is -100%). The maximum drift amount for this transmitter is equal to (10–0)*100% = 10 kPa; thus, the range after drift becomes -10–0 kPa.
The maximum migration amount is -10 kPa; at this maximum value, the range is from -10 to 0 kPa.
Maximum migration amount: 10KPa; range after negative migration: -10KPa to 0KPa
-10KPa--0KPa
The range is 10 KPa, with a maximum negative drift of 10 kPa.