Hanla FMS-2V-T Float Level Switch

Hanla FMS-2V-T Float Level Switch | SPDT 2A 250VAC Heavy-Duty Marine Level Controller

The Hanla FMS-2V-T is a magnetically coupled vertical/chamber float level switch engineered specifically for marine, offshore, and heavy process environments. Built by Hanla IMS (Korea), this instrument operates on an isolated magnetic actuation principle that physically separates the wetted process chamber from the electrical switch compartment. This prevents process fluid ingress, seal failure, and micro-switch fouling under cyclic vibrations and high ambient temperatures.

Engineered to endure design conditions up to 10 kg/cm² (1.0 MPa / 142 PSI) and 180°C (356°F), the FMS-2V-T is widely specified across ocean-going vessels for critical level monitoring. Typical installations include Heavy Fuel Oil (HFO) purifier sludge tanks, marine engine bilge holding wells, boiler feed expansion drums, lube oil drain tanks, and contaminated drain collection sumps. The vertical actuation design delivers high repeat switching accuracy while eliminating chattering associated with sloshing and wave motion inside deep tanks.

Model Details

• Manufacturer: Hanla IMS Co., Ltd. / Hanla Level (Republic of Korea)
• Model Code: FMS-2V-T
• Series: FMS Vertical & Chamber Mount Series
• Manufacturer Part Number (MPN): FMS-2V-T-1607-SPDT
• Model Breakdown:
  • FMS: Float Magnetic Switch
  • 2: Dual chamber / heavy-duty flanged design
  • V: Vertical orientation / vertical flange arrangement
  • T: Terminal box enclosure with test lever / high-temperature specification

Features

1. Hermetically Isolated Magnetic Coupling: Zero physical leak path between the process media and electrical contacts; switch actuation occurs across a non-magnetic pressure boundary via permanent magnetic repelling/attraction.
2. High-Temperature & Pressure Rating: Operates reliably up to 10 kg/cm² operating pressure and continuous operating temperatures of 180°C, preventing premature insulation breakdown in heavy fuel and steam condensate systems.
3. Robust Terminal Architecture: Gold-flashed micro-switch assembly configured in Single Pole Double Throw (SPDT), rated for 2A at 250VAC / 0.5A at 125VDC, optimized for logic inputs (PLC/DCS) or auxiliary trip relay coils.
4. Standard Marine Enclosure: Cast marine bronze or seawater-resistant powder-coated aluminium terminal housing rated to IP56/IP65 weatherproofing to resist salt spray, engine room condensation, and wash-down jets.
5. Integrated Manual Mechanical Test Lever: Allows engine room watchkeepers to mechanically actuate the float arm externally to verify alarm loop and shutdown logic without draining or filling the tank.

Technical Specifications

Applications

• Purifier Sludge & Waste Oil Tanks: High-level alarm (LAH) and automatic sludge transfer pump activation for HFO/MDO purifiers.
• Engine Room Bilge Wells: Low and high bilge level alarm detection in forward, aft, and tunnel bilge compartments.
• Boiler Cascading & Hotwell Tanks: High/Low feed water cut-out alarms under pressurized saturated steam environments up to 10 kg/cm² and 180°C.
• Main Engine Lube Oil Sump & Drain Tanks: Sump scavenge leak detection and level management under vibration.
• Black & Grey Water Holding Tanks: Automated ejector/discharge pump control.
• Exhaust Gas Scrubber Effluent Tanks: Corrosive washwater and soot drainage collection sumps.

Cross-Reference Part Numbers

• Hanla Models: FMS-2V-WS-T, FMS-2H-T, FMS-1V, FMS-V-EX (Intrinsically Safe variant).
• Mobrey (Emerson): S01DB/F84, S01DB/F04, S179.
• Besta (Trimod): A 01 041, A 01 051, 10DA 01 092.
• Musasino: FS-M3-1, FS-M1.
• Daehwa: LS-TM, LS-VM.

Frequently Asked Questions

Can the Hanla FMS-2V-T be used for both high-level and low-level alarms?

Yes. The FMS-2V-T is equipped with a Single Pole Double Throw (SPDT) contact configuration featuring Common, Normally Open (NO), and Normally Closed (NC) contacts. You can wire Terminal COM + NO to trip as a high-level alarm (circuit closes on liquid rise) or Terminal COM + NC to trigger a low-level pump trip / boil dry alarm (circuit opens on liquid drop).

Is the Hanla FMS-2V-T safe for hazardous zone installations?

The standard FMS-2V-T is designed as a watertight, weatherproof IP56 unit for general engine room tanks. For cargo pump rooms, paint lockers, or explosive Zone 0/Zone 1 environments, this dry contact switch must be integrated through a certified Intrinsically Safe (I.S.) galvanic barrier (e.g., Pepperl+Fuchs / MTL) in the safe area switchboard in accordance with marine classification rules.

What is the difference between Hanla FMS-2V-T and FMS-2H-T?

The difference lies in the mounting orientation and geometry: the FMS-2V-T is vertically mounted or chambered with a vertical flanged orientation, whereas the FMS-2H-T is configured for direct horizontal side-wall mounting on the shell of the tank.

What liquid specific gravity is required for the float to actuate?

The FMS-2V-T float utilizes a high-buoyancy stainless steel 316 design capable of operating in liquids with a specific gravity as low as 0.65 g/cm³. This makes it fully operational across marine diesel oil, heavy fuel oil, lubricating oils, and fresh/seawater.

How do I troubleshoot a false high alarm on a sludge or bilge tank?

First, operate the external manual test lever to verify if the internal spring mechanism returns cleanly. If the alarm persists, isolate the electrical supply and check the micro-switch across terminals COM and NO with a multimeter for continuity. If it remains closed while the tank is empty, check for sludge caking on the float or a compromised/punctured float that has flooded with fluid.