Conceptual issues regarding the range and span of differential pressure transmitters
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Taking a certain 118W double-flange differential pressure transmitter as an example: M diaphragm – range: 2.5~100 KPa, span: -100~100 KPa. What does the range of a differential pressure transmitter mean? What does 2.5KPa represent? What does the lower limit of the range: -100 KPa mean? Solve doubts
Range: The actual range of measurements on-site; the minimum differential pressure is 2.5, and the maximum is 100. That is, the output is at its minimum value at 2.5 and at its maximum value at 100. Range: -100 to 100, referring to the measurement range of the transmitter hardware itself, that is, the pressure range it can handle ； This instrument can be used as long as the pressure at the site is between -100 and +100 ； The range is determined by the maximum pressure that can be generated under the specific field conditions; it can be changed as long as it does not exceed the limits of the instrument’s hardware.
I disagree with your view! 2.5KPa~100KPa refers to the minimum and maximum ranges of the double-flange differential pressure transmitter; the range ratio is 40:1. The range is calculated as the difference between the upper and lower limits of the measurement range. For example, this transmitter can be set to measure ranges such as 0~2.5KPa, 0~100KPa, -100~0KPa, and so on. The operating range of -100KPa to 100KPa means that the lower limit of the measurement range is -100KPa, and the upper limit is 100KPa.
The range refers to the difference between the upper and lower measurement limits; the minimum range is 2.5 kPa, while the maximum is 100 kPa, allowing for selection based on actual usage requirements. The measurement range is an interval, that is, it can measure as low as -100 kPa and as high as 100 kPa. If the measurement range is 2.5 kPa and the lower measurement limit is -100 kPa, then the upper measurement limit is -78.5; if the lower measurement limit is 0, the upper measurement limit is 2.5 kPa.
Agree with the explanation on floor 4. . . . . . . . . . . .
The explanations on the third and fourth floors are clear and thorough; I’ve learned it
The explanation on the 4th floor was quite clear; to put it differently again: range = upper measurement limit – lower measurement limit. For diaphragm gauges, the minimum range is 2.5 KPa and the maximum is 100 KPa ； The range is the pressure range that the sensor can detect. For the diaphragm box, it is -100~100 KPa ； The range can be selected or adjusted within the measurement range. That is, both the upper measurement limit and the lower measurement limit must be within the range, and the difference between them must also be within the range of the scale.
Think differently: 1. Range: 2.5~100 KPa, which allows the current output to range from 4 to 20 mA; the corresponding differential pressure range is 2.5~100 KPa. In other words, a change of 2.5 KPA can cause the transmitter’s output to cover the entire range, while 2.4 KPA is not sufficient to achieve a full-scale output of 20 mA. In that case, 100 is also understandable. . . 2. Range: -100~100 KPa, meaning that the measured differential pressure after migration must not be greater than 100, nor less than -100. This table can be described as follows: a diaphragm gauge with a pressure of 100 KPA, featuring a range ratio of 40:1. @jiaguoyun
The measurement range of 2.5~100 KPA means that the minimum value that can be set for this differential pressure transmitter is 2.5 KPA, while the maximum value is 100 KPA