Conductive Level Measurement

Point level detection in conductive liquids.

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Conductive Point Level Detection Liquipoint FTW33
Endress+Hauser
Conductive Point level detection Liquipoint FTW33
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Conductive Point Level Detection Liquipoint FTW32
Endress+Hauser
Conductive Point level detection Liquipoint FTW32
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Conductive Point Level Detection Liquipoint FTW31
Endress+Hauser
Conductive Point level detection Liquipoint FTW31
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Conductive Level Measurement

Conductive level measurement is a point level detection method for electrically conductive liquids. It is commonly applied for reliable high/low alarms, pump control, and overflow prevention in services where the liquid provides a measurable conduction path. The method is intentionally straightforward, favoring long-term stability and low mechanical complexity.

The measuring principle is based on the change in electrical resistance between electrodes when liquid is present versus absent. In many installations, a single-rod probe uses the conductive vessel wall as the counter-electrode; multi-electrode or rope-style probes can provide multiple switch points through one process connection. Because the output is tied to conductivity, the technique is best suited to aqueous solutions or other media above a minimum conductivity threshold.

Key benefits include the absence of moving parts in the vessel and the ability to commission without complex calibration routines. Conductive switches can deliver dependable on/off signaling for inventory protection and control schemes, while minimizing mechanical wear mechanisms and avoiding blockage modes associated with mechanical linkages. Multi-point detection can reduce nozzle count and simplify penetrations on smaller tanks.

Applications are strongest in water and wastewater (lift stations, sumps, clarifiers, chemical dosing tanks), utilities, and process services involving brines, caustics, acids, CIP fluids, and many aqueous process streams. Common control patterns include minimum-level protection to prevent pump dry-run, maximum-level alarms for spill prevention, and two-point control for alternating pumps or maintaining a banded operating level.

Selection should verify that the media conductivity remains above the functional threshold across normal dilution, temperature, and composition changes. Tank material and grounding must be considered - on-conductive vessels may require a dedicated reference electrode. Installation should limit the risk of false bridging from deposits, and output type (e.g., intrinsic-safety NAMUR vs. relay/contact) should align with the control philosophy and hazardous-area classification.

Forberg Smith, an exclusive authorized representative of sales and service for Endress+Hauser.