Capacitive differential pressure transmitter
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In a capacitive differential pressure transmitter, is it generally the high-pressure chamber that is in contact with the medium being measured, while the low-pressure chamber is connected to atmospheric pressure? ? ?
That’s how it usually is. If connected in reverse, the 4-20 output of the meter head must be reversed.
What’s the point of looking at you? General situation: When measuring flow rate, the high-pressure side is connected to the pressure tapping point upstream of the throttling device, while the low-pressure side is connected to the pressure tapping point downstream of the throttling device ； When measuring the liquid level, the high-pressure side is connected to the lower pressure tapping, and the low-pressure side is connected to the upper pressure tapping.
How is the pressure measured? Otherwise, why is the negative pressure side connected to the atmosphere?
All differential pressure transmitters measure the same fundamental quantity; it’s only when measuring unsealed containers that the situation you mentioned arises. In the case of sealed containers, the measurement point for low pressure should also be located on the corresponding container