If diaphragm seal of the submersible pressure transmitter or level probe is selected to measure the filling levels, this often means that the probe can be used under environmental requirements which would cause failure of common level sensors.
pressure gauge 10 bar as for example soiled media, abrasive ingredients and sludge when used in wastewater treatment plants, brackish and wastewater tanks and even digester towers, impose special requirements on the design of a submersible pressure transmitter. One of many requirements on a submersible pressure transmitter would be to have the lowest possible susceptibility to contamination or build-up of the pressure sensor by optimizing its design. This is exactly why the typical design of a pressure transmitter with narrow pressure ports is not used within level probes because it would tend to clog in such applications.
The look of the submersible pressure transmitter and its own pressurised sensor diaphragm is optimised to experience suprisingly low susceptibility to contamination. However, continuous operation in soiled media can lead to sticking of dirt particles on the stainless diaphragm. To obtain the highest accuracy and fastest response times in the event of level change, the thickness of the stainless steel diaphragm is already minimised ex factory to just a couple microns. Therefore, cleaning of the diaphragm must be carried out with caution. Always avoid using sharp or edged tools. Additionally it is strongly advised not to use the commonly used screwdrivers or pens.
If cleaning of the sensor diaphragm is essential, then rinse it utilizing a weak water jet or clean it carefully using compressed air. Damage of the diaphragm due to denting or notching, even if it seems to be purely superficial, leads to significant losses in the accuracy of level measurement. Deformation of the diaphragm often shifts the zero point of the pressure measurement in the internal electronic measurement system and also distorts the output signal linearisation which has been adjusted ex works to the undamaged diaphragm. Thus, เพรสเชอร์เกจ with damaged diaphragm generates falsified measurement of the current filling level and, therefore, can’t be considered a reliable measuring instrument any more. Thus, complete replacement of the damaged instrument is completely necessary.
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