What special design and calibration measures are required for submersible pressure transmitters to ensure accuracy for underwater measurements at different depths?
Publish Time: 2024-08-01
For underwater measurements at different depths, submersible pressure transmitters require special design and calibration measures to ensure accuracy.
In terms of design, the pressure resistance must be considered first. As the water depth increases, the water pressure increases dramatically, and the shell material of the transmitter needs to be strong enough to withstand this pressure. For example, high-strength stainless steel or special alloy materials can be used, and they must be precisely processed and sealed to prevent water from penetrating and damaging the internal components. At the same time, the selection of sensors is also critical. For deeper waters, high-precision and high-stability pressure sensors should be selected to accurately sense small pressure changes. In terms of structure, reasonable diversion and balancing devices should be designed to reduce the impact of water flow impact on measurement. For example, a streamlined deflector is set at the front end of the transmitter so that the water flow can flow smoothly and avoid turbulence that causes pressure measurement deviation.
In terms of calibration, different calibration standards need to be established at different depths. In shallow waters, a relatively simple on-site calibration method can be used to calibrate by comparing with a standard pressure gauge of known accuracy. However, for deep water areas, due to the large pressure changes and complex environment, it is necessary to simulate the water pressure conditions at different depths in the laboratory for accurate calibration. For example, a high-pressure chamber is used to simulate the deep-sea environment, and the transmitter is calibrated point by point to determine its output characteristics under different pressures. In addition, since water temperature will also affect pressure measurement, temperature compensation measures need to be considered. A temperature sensor is integrated in the transmitter to correct the pressure measurement value according to the real-time measured water temperature to improve the measurement accuracy. In addition, as the use time goes by, the transmitter may have problems such as drift, so it is necessary to recalibrate regularly, especially after experiencing measurement tasks with large depth changes. In short, through targeted design and perfect calibration measures, the Submersible pressure transmitter can work accurately and reliably in underwater measurements at different depths.
