Float for Hanla FMS-2H-T Level Switch

Replacement Magnetic Float Assembly for Hanla FMS-2H-T Horizontal Level Switch

The replacement float for the Hanla FMS-2H-T horizontal side-mounted level switch is a critical spare engineered for harsh engine room, ballast, and cargo monitoring systems. Manufactured from high-grade SUS316 / SUS316L stainless steel, this sealed, pressurized float carries an integrated permanent Alnico/Rare-Earth magnet inside its internal counter-pivoted armature assembly.

Operating on glandless magnetic flux coupling, the float moves relative to liquid surface variation, repelling or attracting the magnetic follower inside the isolated terminal housing to mechanically trip the snap-action microswitch. Because no mechanical shaft seals or bellows breach the wetted chamber wall, fluid boundary integrity remains 100% leak-tight even under continuous 10 bar process pressures and heavy vessel vibration profiles.

Model Details

• Manufacturer: HANLA IMS Co., Ltd. (South Korea)
• Target Unit Series: FMS Series Horizontal Level Switches (Standard & Test-Device Types)
• Target Switch Model: FMS-2H-T / FMS-2H-WS-T
• Manufacturer Part Number (MPN): HL-FMS2H-FLT-01 (Replacement Float & Pivot Sub-Assembly)
• Standard Connection Coupling: Factory balanced for standard JIS 5K / 10K 65A/80A mounting boss configurations
• Operating Mechanism: Horizontal float arm with internal magnet carrier and heavy-duty fulcrum pivot pin

Technical Details

Compatible Base Equipment & Switches

• Hanla Level Switches: FMS-2H, FMS-2H-T, FMS-2H-WS, FMS-2H-WS-T, FMS-1H-T
• Flange Standards Supported: JIS 5K 65A, JIS 10K 65A, JIS 5K 80A, ANSI 150# 2.5” / 3” tank-entry sleeves
• Target Alarm Panels: Hanla Bilge Alarm Panels, Engine Room High/Low Level Annunciator Panels, Integrated Automation Systems (IAS)

Part Number Cross-References

• Hanla OEM Part Number: FMS-2H-T Float Sub-Assembly / Part No. HL-FMS-FLT-2H
• Alternate Drawing Codes: FMS2H-T-P03, FMS-2H-WS-T-02
• Functional Equivalents (Subject to Flange & Reach Validation): Nakakita NS770 Series float arms, Musasino Level Switch Spares, Barksdale MS-Series Marine Floats

Applications

• Engine Room Bilge Wells: Reliable high-level alarm signalling in dirty oily bilge tanks prone to floating residues, sludge, and water mixtures.
• HFO / MDO Service & Settling Tanks: Continuous high/low point-level alarm safety interlocks for boiler and engine fuel delivery modules.
• Lubricating Oil Sump & Drain Tanks: Low-level trip actuation guarding high-value propulsion and auxiliary crankcases against loss of lubrication.
• Ballast Water & Void Spaces: Remote dry/wet boundary detection for ballast monitoring and void space leak-detection alerts.
• Sewage & Greywater Holding Tanks: Corrosion-proof point switching unaffected by biological foaming or ambient maritime humidity.

Frequently Asked Questions

What does the “-T” designate in the Hanla FMS-2H-T level switch?

The “-T” suffix designates an external manual test device (lever/crank). This mechanism allows marine engineers and class surveyors to manually deflect the float arm upward from outside the tank to verify switch contact transition and alarm actuation without filling the tank with liquid.

Can this replacement float be used in both fuel oil and bilge water?

Yes. Fabricated from marine-grade SUS316L stainless steel, the float is corrosion-resistant and engineered with a low specific gravity threshold (S.G. ≥ 0.70), making it suitable for viscous fuel oils, marine diesel, lubrication oils, clean water, and oily bilge liquids.

How do I identify if my switch failure is caused by the float or the microswitch?

First, operate the external test lever. If the electrical alarm triggers correctly during manual actuation but fails to activate when fluid rises to the switch level, the float has either taken on liquid (punctured), suffered buildup/fouling, or the pivot is bound by scale. If the test lever does not trigger the alarm, inspect the microswitch contacts for carbon pitting, open coils, or terminal moisture ingress.

What are the standard electrical terminal allocations on the FMS-2H-T?

Inside the dry terminal housing, the standard wiring configuration comprises Terminal 1 (Common – COM), Terminal 2 (Normally Open – NO), Terminal 3 (Normally Closed – NC), and an internal chassis ground stud. As the float rises, Terminal 1 breaks from Terminal 3 and connects with Terminal 2.

Is it necessary to drain the tank completely to replace the float?

Because the FMS-2H-T is a horizontal side-mounted level switch, the liquid level inside the tank must be pumped down below the mounting nozzle elevation before unbolting the switch flange. Ensure appropriate tank degassing and permit-to-work procedures are followed if opening fuel or toxic service tanks.