Question of the Week: Discussion Topic for Week 15, 2011, on Instruments and Meters
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This post was last edited by narshi on 2012-12-1 17:59. Is the calibration range of a gauge the same as its measurement range? Why? Answer: No. Since the instruments we use generally cannot directly reflect parameter values, but rather require conversion – for example, using differential pressure to indicate liquid level height – and some instruments need calibration during on-site measurement, the calibration range of the instrument and its corresponding measurement range are not the same thing.
The gauge range generally refers to the range indicated on the instrument’s nameplate, that is, the maximum range that the instrument can measure. The calibrated range is set according to the process conditions and corresponds to the 4-20mA signal; it represents the operating range of the instrument. Usually, the gauge range is somewhat larger than the calibrated range
The calibration range of the instrument is different from the instrument’s actual range. The calibration range of the instrument is set according to the process conditions; it is what we need. However, this range must be smaller than the instrument’s actual range and within that range – with the minimum corresponding to a 4mA signal and the maximum corresponding to 20mA. The instrument’s range refers to the range indicated on its nameplate, that is, the maximum range that the instrument can measure. As well as the best section of the linear range for the instrument.
The calibration range of the instrument refers to the measurement range required by the process. The measurement range of a gauge is the maximum and minimum values it can handle from the time it leaves the factory. He included the calibration range of the instruments
It’s different: the calibration range of an instrument refers to the range set according to the requirements of the process, while the measurement range of the instrument is the maximum value that it can measure from the time it leaves the factory. The calibration range is included within the instrument’s measurement range
They are not the same thing. The gauge range is a specific numerical value, such as 200 kPa, while the measurement range refers to the interval between the lower and upper limits of measurement, for example, 0–200 kPa
This post was last edited by denghl on 2012-12-1 19:49. That’s not correct. The measurement range is the interval that an instrument can cover within its accuracy limits, whereas the calibrated range is an interval that is adjusted within that measurement range to meet specific measurement requirements. It may be identical to the measurement range, or it may be smaller than it, but it cannot be larger than the measurement range.
Reply to 1# Baghdad: The calibration range of an instrument is the range it is actually used at, and it must not exceed the instrument’s specified range. The instrument range refers to the extreme limits of the instrument’s measurement capability, that is, it indicates what the minimum and maximum values that can be measured are.
The calibration range of the instrument is a range that is determined through calculation or based on process conditions in practical applications. The measurement range of an instrument is the actual application range it comes with from the factory. Generally, the calibration range of a gauge is smaller than its measurement range
The calibration range of a meter is the range it is used in during actual operation, and it must not exceed the meter’s specified range. The instrument range refers to the extreme limits of the instrument’s measurement capability, that is, it indicates what the minimum and maximum values that can be measured are.
The last edit to this post was made by denghl on 2012-12-1 at 19:49. It’s different: the calibrated range is the range determined after the instrument leaves the factory, and it is related to the measurement requirements; the instrument is restricted to measure within this range. The measurement range refers to the range that an instrument can measure after it is manufactured; it is related to the manufacturing process. The measurement range is generally larger than the calibrated range, after which a specific segment of this range is selected as the calibrated range