Differential pressure sensor works
The sensor is installed through a certain design structure or according to regulations. It changes the pressure before and after the change in pressure to change the pressure sensor in the sensor, and then the output is processed by the pressure-sensitive element to generate a weak signal for processing and modulation, or through analog-to-digital conversion and chip operation processing. , Output analog signal or digital signal.
Example: The working principle of the capacitive differential pressure transmitter (differential pressure sensor): The pressure transmitter measures the two pressures of the medium into the high and low pressure chambers and acts on both sides of the delta element (ie, the sensitive element). The isolation diaphragm is transported to both sides of the measurement diaphragm through the spacer and the filling liquid in the element. Measure the diaphragm and the electrodes on both sides of the insulating sheet to form a capacitor.
When the pressures on both sides are inconsistent, the measuring diaphragm is displaced, and the displacement is proportional to the pressure difference. Therefore, the capacitance on both sides is not equal, and the signal is proportional to the pressure through the oscillation and demodulation steps. Then the signal is modulated to obtain the modulation current. The A/D converter converts the current of the demodulator into a digital signal whose value is used by the microprocessor to determine the input pressure value. The microprocessor controls the operation of the transmitter. In addition, it performs sensor linearization, resets measurement ranges, engineering unit scaling, damping, square root, and sensor trimming operations, as well as diagnostics and digital communications. To display, control.