Cleaning of submersible pressure transmitters or level probes

If the specific pressure sensor design of the submersible pressure transmitter or level probe is selected to gauge the filling levels, this can indicate that the probe can be used under environmental requirements which would cause failure of common level sensors.
The most adverse conditions such as for example soiled media, abrasive ingredients and sludge when found in wastewater treatment plants, brackish and wastewater tanks and even digester towers, impose special requirements on the look of a submersible pressure transmitter. One of the main requirements on a submersible pressure transmitter would be to obtain the lowest possible susceptibility to contamination or build-up of the pressure sensor by optimizing its design. This is the reason the normal design of a pressure transmitter with narrow pressure ports is not used within level probes because it would have a tendency 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 may lead to sticking of dirt particles on the stainless steel diaphragm. To obtain the highest accuracy and fastest response times in the event of level change, the thickness of the stainless steel diaphragm has already been minimised ex factory to just a few microns. Therefore, cleaning of the diaphragm must be carried out with caution. Always stay away from sharp or edged tools. Buy is also strongly advised never to use the popular screwdrivers or pens.
If cleaning of the sensor diaphragm is necessary, then rinse it using a weak water jet or clean it carefully using compressed air. Damage of the diaphragm because of denting or notching, even if it appears to be purely superficial, results in significant losses in the accuracy of level measurement. Deformation of the diaphragm often shifts the zero point of the pressure measurement in the inner electronic measurement system and also distorts the output signal linearisation which has been adjusted ex works to the undamaged diaphragm. Thus, the submersible pressure transmitter with damaged diaphragm generates falsified measurement of the current filling level and, therefore, can’t be considered a reliable measuring instrument any longer. Thus, complete replacement of the damaged instrument is absolutely necessary.
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