Seeking an answer
Thread Content
A vacuum pressure transmitter has a range of -100 to 200 kPa. During calibration, the maximum error occurs at 100 kPa; the calibration gauge indicates 99 kPa at the upper limit and 101 kPa at the lower limit. Does this gauge meet the accuracy requirement of class 0.5? How to solve this problem?
The maximum allowable tolerance for the transmitter is ±(200 – (-100)) * 0.5% = ±1.5 kPa. At 100 kPa, the stroke error is 100 – 99 = 1 kPa, which is less than 1.5 kPa; at 100 kPa, the stroke error is 100 – 101 = -1 kPa, which is also less than 1.5 kPa. Thus, it meets the requirements of class 0.5. However, at 100 kPa, the hysteresis reaches 2 kPa, which is greater than 1.5 kPa. It does not meet the requirements of grade 0.5.
Is it compliant or not? ?
Does not meet the requirement; the return difference cannot be greater than the maximum allowable error
Due to the non-compliance with the accuracy requirement, it is concluded that the transmitter does not meet the 0.5 class specifications.
I’ve learned it,, thank you! I never considered the difference in return. . . . .