If the precise pressure sensor design of the submersible pressure transmitter or level probe is selected to gauge the filling levels, this can indicate that the probe is 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 used in wastewater treatment plants, brackish and wastewater tanks or 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 obtain the lowest possible susceptibility to contamination or build-up of the pressure sensor by optimizing its design. For this reason the normal design of a pressure transmitter with narrow pressure ports isn’t used within level probes since 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 diaphragm. To obtain the highest accuracy and fastest response times in the event of level change, the thickness of this stainless steel diaphragm is already minimised ex factory to just a couple microns. Therefore, cleaning of the diaphragm must be completed with caution. Always stay away from Ingredients or edged tools. Additionally it is strongly advised not to use the commonly used screwdrivers or pens.
If cleaning of the sensor diaphragm is necessary, then rinse it utilizing a weak water jet or clean it carefully using compressed air. Sizzle of the diaphragm because of denting or notching, even though it seems 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 internal electronic measurement system and also distorts the output signal linearisation which includes 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 trusted measuring instrument any more. Thus, complete replacement of the damaged instrument is completely necessary.
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