Digital Pressure Gauge Circuit

This electronic pressure gauge utilizes a Wheatstone bridge-type pressure sensor to drive a 3 A digit A/D converter and a display. IC1 is a quad op-amp that interfaces the bridge sensor to the A/D converter. R16 allows for zero adjustment, while R6 is used for full-scale calibration. Additionally, diodes D1 through D4 provide temperature compensation.

The electronic pressure gauge operates by employing a Wheatstone bridge configuration, which consists of resistive elements that change their resistance in response to pressure changes. This configuration is sensitive and provides high accuracy in measuring pressure. The output from the bridge sensor is a small voltage that is proportional to the applied pressure. This signal is then amplified by the quad op-amp (IC1), which serves to boost the signal level to a range suitable for the A/D converter.

The A/D converter, with a specification of 3 A digits, converts the amplified analog signal into a digital format that can be displayed. The display component can be a standard LCD or LED that visually represents the pressure reading in real-time.

For calibration purposes, resistor R16 is implemented to allow for zero adjustment, ensuring that the gauge reads zero when no pressure is applied. This is critical for maintaining accuracy, especially in applications where precise pressure measurements are required. Resistor R6 provides full-scale calibration, allowing the user to set the maximum reading of the gauge according to the specific application requirements.

The inclusion of diodes D1 through D4 serves a vital role in temperature compensation. As temperature affects the resistance of the sensor elements, these diodes help stabilize the output signal, ensuring that temperature variations do not lead to erroneous pressure readings. This feature is particularly important in environments where temperature fluctuations are prevalent, thereby enhancing the reliability and accuracy of the pressure measurements.

Overall, this electronic pressure gauge design combines precision sensing, signal amplification, digital conversion, and temperature compensation to deliver accurate pressure readings for various applications. This electronic pressure gauge uses a Wheatstone bridge-type pressure sensor tb drive a 3 A digit A/D converter and a display. IC1 is a pump (quad) that interfaces the bridge sensor to the A/D converter. R16 provides zero adjustment and R6 provides full-scale calibration. D1 thru D4 provide temperature compensation.