NE - Conductive Level Switch

The KOBOLD NE conductive level switch is a rigid-probe level sensor that monitors conductive liquids with a minimum conductivity of 20 µS/cm in industrial tanks and vessels. With no moving parts and up to six sensing points from a single device, it is designed for dependable service in high-viscosity, low-density, or particulate-heavy media.

Electrodes are available in 316-Ti stainless steel, Hastelloy® C, or titanium, accommodating corrosive environments when paired with compatible fittings. Housing options include polycarbonate or aluminum for single-point models (1/2-inch NPT) and polyamide or aluminum for multipoint models (1-1/2-inch NPT), both with an IP65 protection rating for harsh conditions. Operating pressures reach 440 PSIG with stainless steel fittings, and temperatures reach 300 °F (150 °C) with PTFE cladding.

How the NE Conductive Level Switch Works

The NE operates on an electrical conductivity detection principle. When liquid contacts a sensing electrode, it completes a low-voltage circuit (10 VAC, max 0.5 mA) between the sensing electrode and a ground reference, such as the tank wall or a separate reference electrode, and the relay/power supply triggers the corresponding SPDT relay.

Each electrode is coated with non-conductive cladding except for the last 1/4 inch, so fully coated electrodes assure proper monitoring even in the presence of mist formation and impure media. Adjustable sensitivity from 0-50 kΩ via a potentiometer allows precise adaptation for specific liquid conductivity and prevents false signals from foam or residues.

Relay Modules Are Ordered Separately

The NE requires a separate relay/power supply module to complete the system. These DIN-rail mountable units process the conductivity signal from the electrodes and provide relay outputs for direct integration with control systems, pumps, or alarms. Modules support single-point or multipoint configurations with 24, 110, or 230 VAC power supplies (±15%, 50-60 Hz).

Each module provides one or two independent SPDT relay outputs rated for 250 VAC at 5 A maximum, enabling fail-safe switching for high or low level alarms. Installation is straightforward: the compact module mounts on standard DIN rail, connects to the NE probe via shielded cable, and provides screw-terminal outputs for easy wiring. The IP40-rated enclosure protects internal components in typical industrial electrical environments. When ordering, specify the number of sensing points (1-6), required voltage, and desired relay configuration.

Common Applications and Use Cases

The NE excels in automated tank management where reliable liquid level monitoring is critical: low level detection and alarm, high level detection and overflow prevention, automated tank filling, and automated tank emptying and transfer. Its versatile multipoint capability and robust construction suit a wide range of industrial process control scenarios.

• Low level detection and alarm: monitor minimum liquid levels in storage tanks, sumps, and process vessels; when liquid drops below the sensing electrode, the relay triggers an alarm or shuts down transfer pumps, helping prevent dry-running, cavitation, and equipment damage.
• High level detection and overflow prevention: in receiving tanks, day tanks, and batch processing vessels, the high-level electrode activates the relay to stop incoming flow, close inlet valves, or sound an alarm before the tank reaches maximum capacity.
• Automated tank filling: configure low and high setpoints to start fill pumps when the level drops below a designated point and stop them at the desired fill level, for water treatment systems, chemical batching, and bulk liquid storage.
• Automated tank emptying and transfer: in wastewater treatment, condensate collection, and industrial drainage, the system activates transfer pumps at a high setpoint and deactivates them at a low setpoint, supporting unattended operation and complete drainage cycles.

With up to six independent setpoints available on a single probe, the NE Series enables sophisticated multi-level control strategies such as pump sequencing, backup alarm activation, and multi-stage process control, all from one reliable, maintenance-free sensor assembly.

Build America, Buy America (BABA) Compliance

The KOBOLD NE conductive level switch with rigid probes is manufactured in the USA and is fully compliant with Build America, Buy America (BABA) requirements, making it eligible for federally funded infrastructure projects. BABA-compliant models are listed among the product's standard features, alongside quick delivery.

Cable-Suspended and Compact Versions

The NE Series also includes the NEH cable-suspended conductive level switch, for applications that require much longer probe lengths and for tanks where low overhead clearance restricts or complicates installation. For even tighter installation spaces, consider the NEK compact conductive level switches.

Common Questions about NE - Conductive Level Switch