Questions regarding the pressure measurement range of differential pressure transmitters

It’s better to say the range rather than the measurement range. The data in the middle represents the minimum range; for example, the minimum measurement range for the first set of values is 0~0.1 kPa. If the data is provided by the design institute, it is possible that the value is lower than this; in such cases it is 0 (low-current signal suppression)

This is an intelligent transmitter, which allows the range to be adjusted within this limit: lol

The intermediate value as I understand it refers to the minimum range that ensures the desired accuracy level. For example, in the range of 0–31.1 to 186.8 KPa, the maximum differential pressure is 0–186.8 KPa; this range constitutes the upper limit of the instrument, ensuring accuracy across the entire operating range. If a range of 0~31.1 is sufficient to meet the accuracy requirements, then of course you can also use a range of 0~15 for this instrument… However, in some cases the accuracy requirements may not be fully met, but the impact is not significant. By meeting the accuracy requirements, it means that if your transmitter is rated at 0.2 grade, then the maximum error for any measurement value across the entire range should not exceed 0.2%. If the instrument isn’t selected based on its rated range, the error in certain parts of the measurement range might exceed 0.2%, but it won’t be too extreme.

Thank you to the people above for their help!

For example, I have a bunch of sticks here; the shortest one is 10 cm long and the longest one is 90 cm long. If you’re to measure the length of each stick, it’s best to bring a meter stick with you – this is the measurement range of 0 to 100 cm. To use another example, the shortest of these sticks is 10 cm long, while the longest one is 3 meters long; in that case, a meter stick won’t suffice – you should bring a 5-meter tape measure instead. There is also a special case: in this set of sticks, the shortest one is 1 cm long while the longest one is 5 meters long. In such a situation, a 5-meter tape measure may not be suitable, as using it to measure a length of 1 cm would result in significant errors. It is therefore recommended that, in addition to a 5-meter tape measure, you also bring along a smaller measuring tool that can measure in millimeters. The same is true for the measurement range of transmitters: there is a maximum value and a minimum value. When the difference between these values is not significant, it’s sufficient for the transmitter’s range to be greater than the maximum value. If the difference is large, in industrial applications two transmitters with different ranges are usually used to ensure measurement accuracy. You can find many examples of such measurements online

The pressure measurement range of the differential pressure transmitter is 0–0.1 to 1.0 KPa, which means that the minimum range of this transmitter can be set to 0–0.1 KPa; it’s not possible to set it to 0–0.05 KPa. Do you understand now? lol

“\"0-1.3～6.0KPa\" 6.0KPa is the rated range, that is, the maximum allowable operating range and the maximum safe operating range. 1.3KPa is the minimum allowable operating range, the lowest range for reliable use. Divider line----------------------------------------- Science tip: Any measuring instrument has three inherent parameters: resolution, time drift (zero drift + full-scale drift), and temperature error coefficient. These three indicators are innate and remain unchanged throughout eternity. Resolution: for a relatively small absolute measurement range, the relative migration is low; however, for a larger working range, the relative migration becomes higher. Time drift (zero drift + full-scale drift): the relative amount within the range is small; however, for a working range with less relative migration, the value will be larger. For the temperature error coefficient, the relative magnitude is small within a limited range; however, as the operating range increases, the relative migration becomes larger. Therefore, the range shift of the instrument’s operating range must be limited; it generally should not exceed 5:1, with a limit of 10:1 being commonly accepted. The so-called 100:1 migration ratio ignores accuracy and the extent of relative error; it’s pure nonsense, complete nonsense. Got it? Who still doesn’t understand? May he have to stay and watch the door during the Dog Year, and not be able to celebrate the New Year. :lol

First, it is necessary to distinguish between the measurement range and the scale range； The measurement range is the interval between the minimum and maximum values of the process parameters that can be measured ； The range is the interval between the minimum range and the maximum range. For example, a measurement range of 0–0.1 to 1.0 KPa means that the minimum measurement value is 0–0.1 KPa, while the maximum measurement value is 1.0 KPa.