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A) Materials that are conductive
can cause a short circuit between a
bare stainless steel probe and the
tank wall. As the liquid level drops,
the probe remains wetted, providing
a conductive path between the
probe and the tank wall. The faster
the level changes, the more likely
this false indication is to occur. For
this situation, we recommend the
use of PTFE or other types of
insulator coatings on the rod
B) Material build-up also affects the accuracy of RF capacitive measurements, and therefore additional adjustment to the probe’s sensitivity is recommended. Housings must also be compatible with the requirements for hazardous, wash-down, wet, and/or dusty environments. Explosion proof environments may require the housing to be certified. In addition, the active probe might need to be intrinsically safe or have an intrinsic safety barrier. The electronic circuitry of the probe performs several functions such as rectifying and filtering the incoming power, generating the radio frequency signal, measuring the changes in current flow, analogue signal generators and display meters. The circuitry is provided with potentiometer adjustments for setting sensitivity that is located in the housing of the probe. These adjustments give an added level of fine tuning which enable our customers to control the probes’ sensitivity with greater accuracy.
The LVCN4300 Series point level switch probe works as a remote probe and is compatible with the LVCN400 series relay. This combination allows the electrode to be used in temperatures up to 177°C (350°F). The LVCN4300 is a very compact 316SS switch.