Small-signal rejection for pressure transmitters
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I have a question: why is it necessary to use small-signal rejection when using a single-flange pressure transmitter to measure pressure? The range of this transmitter is -100 to 1000 kPa, and when the pressure is below 10 kPa, the transmitter displays 0. The manufacturer says it’s due to small-signal rejection – is that correct? Why?
Small-signal rejection is primarily considered from the perspective of analog circuits, as it is difficult to output signals effectively. The DDZ-2 type instruments are widely used; the small-signal rejection mechanism discussed here is mainly intended to prevent fluctuations. But in your description, it’s not the small signal that was cut off – it’s a gauge that measures vacuum pressure, and it stopped working before negative pressure was reached, right? There’s a problem with the table, right~
Yes, I requested a model that can measure vacuum with negative pressure down to -100 kPa
Check the range setting; visually estimate the migration range~
The range is fine; it’s still -100 to 1000
What does a single-flange pressure transmitter mean? ? What is being measured? ? Gauge pressure? ? ? Liquid level? ? Or? ? For gauge pressure, just zero it out when the pressure is equal to atmospheric pressure. However, the range is from -100 to 1000 – is it used for measuring vacuum? ……Whether I understand the question or not! ! ……But from a visual inspection, I guess there’s an issue with zeroing! Re-calibrating the zero point precisely should solve it!
Small-signal rejection is used for differential pressure flow measurement, right? Why is it applied in pressure measurement as well? Even so, with such a wide range of -100 to 10, are the signals that get cut out the weak ones?
According to the range you mentioned, the gauge should display 9.09% at atmospheric pressure. Check what the output current is, and take a look at the diaphragm of the gauge; it seems there might be a problem with it! Small-signal rejection is used to prevent disturbances; it is commonly applied to flow rates, while pressure is generally not taken into account! Contact the manufacturer and ask!
Does the pressure transmitter require small-signal rejection? It seems that only transmitters that measure flow rate based on pressure difference are needed, right? If the fluctuations are large, the damping can be adjusted. . . I haven’t seen it. . . I’m too ignorant~~~~