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Measuring highly corrosive liquid levels with plastic submersible hydrostatic sensors
1st August 2007
 Some fluids will corrode stainless steel over time and although the erosion of material is only fractions of an inch per year in many cases, this is significant when considering the thickness of level sensor diaphragms which can vary between a few thousandths of an inch to 2mm. In these types of applications ceramic sensor elements offer excellent corrosion resistance to the most aggressive media such as acid or alkaline liquids.
If you need to measure the level of a highly corrosive chemical it maybe necessary to eliminate stainless steel wetted parts entirely by constructing the sensor housing out of plastic. To ensure a long lasting seal between the ceramic sensor element and the plastic moulding an O-ring must also be made from a compatible material such as EPDM. If it is not possible to fit liquid level sensors to the outside of chemical storage tanks then you may have to consider using a submersible plastic level sensor. The cable will also need to be resistance to corrosive chemicals as well and cable jackets made from PVC, PTFE or FEP will need to be specified to avoid long term cable deterioration. The LMK 809 submersible plastic level sensor measures low pressure ranges from 1.6 to 4 metres of water gauge and has a ceramic pressure sensor element which is ideal for use with corrosive liquids. Depending on the chemical compatibility required the LMK809 PVC IP68 hydrostatic level sensor can have a PVC or PVDF sensor housing which both offer excellent compatibility for a wide range of corrosive fluids. Any length of PVC, PUR or FEP jacketed cable can be fitted onto the LMK-809 submersible plastic level sensor to provide chemically resistant IP68 rated electrical wiring. Depending on the temperatures and corrosion protection required FKM, EPDM or FFKM O-rings can be selected for the liquid pressure tight seals used in the LMK809 level sensors construction. The electrical output of the LMK 809 IP68 chemical level sensor is a 4-20mA signal which is accurate to ±0.25% full scale at room temperature including linearity, hysteresis & repeatability. For higher range pressure levels from 6 to 100 mH20 gauge the LMK807 plastic immersion level sensor is available which has the same specification as the LMK809 apart from a smaller diameter of 35mm.
Related Products LMK807 product page for technical data and pricing LMK809 product page fo data sheets and quote requests PVC liquid level sensors Submersible flush diaphragm hydrostatic level sensors IP68 immersible pressure sensors
Associated Topics Very low range depth measurement Monitoring level with corrosive liquids Miniature borehole level measurement Preventing failures of vented submersible hydrostatic sensors Calculating the required hydrostatic range What hydrostatic level sensor to use with different media Improve installation of vented IP68 level sensors
Resources Convert meters of water gauge into other pressure units Conversion factors for mH2O column pressure units Guide to pressure sensor specifications
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