The resistive principle uses the conductivity of the liquid to be tested. The electrical current travels through the liquid and comes into contact with the electrode detecting the reached level. The probes are available with single or multi-rod or rope electrodes (max 5). Process connections are extremely varied, threaded, flanged or sanitary type with different sizes and materials. Control units associated with the resistive probes allow the user to set the sensitivity, the delay times and also to check the connections between the probe and the control units.
This principle is particularly suitable for the use on powders and granules when electrical capacitance changes or electrostatic charges make other measurement principles ineffective. The operation principle is based on the fork vibration, generated by the electronic insert, which is absorbed by the product when it is in contact with the vibrating fork. The electronic insert is removable and can be powered with any voltage (RSL200). The calibration, fully digital, is via two buttons and allows the user to select the alarm type (Max-Min), the sensitivity (Low-High) and the delay time (1s to 4s). It is also available in ATEX version (RSL200)