Cognesense - Measure, Monitor, Protect

MCG 8151

The MCG 8151 Flexible Magnetostrictive Level Probe is designed for terminal operators, refinery engineers, wastewater process managers, and EPC system integrators who require accurate and continuous liquid level and interface measurement in tanks with limited access or movement.

This probe delivers 0.001 inch resolution, average temperature sensing, and multi-interface detection within a flexible, corrosion-resistant PVDF housing.

Unlike rigid probes or traditional float-based transmitters, the MCG 8151 features a flexible design for easy installation in tanks up to 70 feet deep. It supports dual-float operation for simultaneous measurement of product and interface levels and integrates five embedded RTDs to provide accurate average product temperature measurements.

MCG 8151 Flexible Magnetostrictive Level Probe

Applications

Tank Retrofits: The flexible probe design allows simple drop-in installation through 2″ to 4″ openings, reducing labor and simplifying retrofits in existing tanks.
Interface Detection: Dual-float sensing accurately identifies water bottoms and BS&W, helping prevent contamination and ensuring product quality.
Temperature Compensation: Five embedded RTDs help correct measurement errors caused by thermal stratification, providing accurate volume calculations.
Limited Access Tanks: Flexible construction simplifies installation in difficult environments such as underground storage tanks or buried tanks.

Technical Specifications

Parameter

Specification

Measurement Technology

Magnetostrictive

Resolution

0.001 inch

Maximum Length

Up to 840 inches (70 ft)

Temperature Measurement

Average of five internal RTDs

Temperature Resolution

0.01 °F

Materials

PVDF flexible probe with stainless steel or polyurethane floats

Mounting Options

2″, 3″, or 4″ openings (NPT or flanged) with top-mounted installation

Communication Protocol

L&J Tankway (compatible with MCG 1010M receivers)

Accuracy

0.001 inch level measurement, ±0.2 °F temperature accuracy

Certification

Explosion-proof or intrinsically safe when used with approved receivers

2026 COST ESTIMATE

Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

Why is a flexible probe better for certain tank applications?

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A flexible probe is ideal for tanks that are deep (up to 70 ft), horizontal, or have limited access risers. It can be easily coiled for shipping and dropped through small tank openings (2-inch or 3-inch) without requiring scaffolding or major construction, significantly reducing installation time and cost.

How does the MCG 8151 measure two liquid levels at once?

The probe uses a dual-float system. One float is heavy enough to sink through the product and rest on the water/product interface (for the interface level), while a second, lighter float rides on the top surface of the liquid (for the product level). The magnetostrictive receiver tracks the position of both magnetic floats simultaneously.

Does the five-point temperature measurement provide custody-grade data?

Yes. The five embedded RTDs allow the probe to accurately map the vertical temperature profile of the product, mitigating errors caused by thermal stratification. This calculated true average temperature is a fundamental requirement for achieving the high accuracy and compliance standards (API 2540) needed for custody transfer.