• Sigma Instruments Company

Conductivity Level Switch

SIGMA's Conductivity Level Switches are simple, low cost and reliable instruments, for detection of conductive liquids. The Level Switch is available in single / multipoint level detection. A low alternating voltage is impressed between the active electrode(s) and the vessel wall / reference electrode. When the liquid comes in contact with the tip of the active electrode(s), an electrical path to ground is completed, closing the loop, resulting in flow of current. The current is transmitted to the control unit directly (in case of multiwire / integral design) or through a pre amplifier housed inside the probe head (in case of two wire design). The amplifier inside the control unit processes the signal and amplifies it to drive LED/ relay circuits.