Dold Liquid Level Relay MK9151N.12 2-450kOHM AC230V 0-20s, DIN Rail Mount, 4A Relay Output

The Dold MK9151N.12 2-450kOHM AC230V 0-20s liquid level relay is engineered for reliable level monitoring and control of conductive liquids and powders in diverse industrial settings. Featuring DIN Rail mounting, this device accommodates a single voltage input with an internal AC voltage measuring circuit that prevents electrolysis and ensures interference immunity through galvanic isolation.

This robust relay supports 2-point and 1-point level control via three electrode connections and offers a wide resistance setting range from 2 kΩ to 450 kΩ to differentiate liquid from foam accurately. Programmable response and fallback delays between 0.2 seconds and 20 seconds can be adjusted independently for minimum and maximum levels, providing precise control over liquid levels. Two changeover relay outputs rated at 4 A enable reliable signalling for control or alarm functions.

Equipped with clamp terminals and LED status indicators for operational readiness and contact position, the MK9151N series supports maximum electrode lead lengths up to 3000 meters, facilitating flexible installation in complex piping or tank configurations. It operates effectively within a temperature range of -20°C to 60°C, suitable for a variety of industrial environments including wastewater management, chemical processing, and fluid handling systems.

With compact dimensions of 22.5 mm width, 90 mm length, and 98 mm overall depth, this relay fits standard DIN Rail profiles for straightforward integration into existing control panels and systems. It complies with IEC and CE standards but does not feature hazardous area certification.

Supports minimum and maximum level monitoring for conductive liquids and powders. Measuring circuit employs internally generated AC voltage (~30 Hz) to prevent fluid electrolysis. Wide setting range from 2 kΩ to 450 kΩ for foam differentiation.

Adjustable response and fallback delay from 0.2 to 20 seconds for precise control. Two 4A relay output changeover contacts allow flexible control and signalling. Galvanically isolated measuring circuit ensuring immunity to electrical interference.

Max electrode lead length of 3000 meters enables versatile sensor deployment. Durable clamp terminal type and clear LED indicators for status monitoring. Operating temperature range from -20°C to +60°C suits many industrial applications.

Compact size and DIN Rail mount maximizes installation convenience.

This Liquid Level Relay is ideal for industrial, manufacturing, water treatment, and HVAC applications requiring precise level detection and protection against overfilling or dry running. It also aids in monitoring mixing ratios and general resistance related controls.

Explore EnvMart categories for more automation and control gear devices to support your industrial instrumentation needs.