Hanla FMS-E-1V-ES-T Vertical Float Level Switch

Hanla FMS-E-1V-ES-T Vertical Type Float Level Switch (Complete Stainless Steel)

The Hanla FMS-E-1V-ES-T is a vertical-mounted magnetic float level switch engineered by Hanla IMS. Designed specifically for arduous shipboard service—including high-vibration engine room tanks, bilge wells, heavy fuel oil (HFO) settling tanks, and marine boiler auxiliary systems—this instrument provides point-level alarm, pump control, and low/high level shutdown capabilities.

The unit utilizes a magnetic coupling principle across a non-magnetic hermetic diaphragm barrier. The electrical microswitch assembly is isolated from the tank fluid and process pressure, eliminating dynamic seals and packing glands that cause fluid ingress or leakage. Constructed entirely with argon-gas-welded marine-grade stainless steel wetted components, the FMS-E-1V-ES-T delivers high resistance to caustic sludges, marine atmospheric corrosion, and thermal cycling.

Model Details

• Manufacturer: Hanla IMS Co., Ltd. (South Korea)
• Series: FMS Series (Float Magnetic Switch)
• Complete Model Code / MPN: FMS-E-1V-ES-T

Code Designation Breakdown:

• FMS: Float Magnetic Switch Series
• E: Explosion-proof / Flameproof or Marine Standard Construction Enclosure
• 1V: Single Contact (1-Point), Vertical Top-Mounted Configuration
• ES: Complete Stainless Steel Wetted Parts & Chamber Assembly (SUS304 / SUS316)
• T: Integrated Manual Test Device / Check Lever (allows manual operational testing of contact mechanism without raising liquid level)

Part Number Cross-References

• Hanla IMS Alternatives: FMS-1V-WS-T, FMS-2V-WS-T (Dual contact version), FMS-1H-WS (Horizontal configuration), FMS-2H-WS-T.
• Functional Marine Cross-References:
  • Danfoss / Marine Liquid Level Switches (MBV / RT series float switches)
  • Mobrey / Emerson Marine Float Switches (MCU / Vertical Magnetic models)
  • Barksdale / Gems Marine Level Sensors
  • Tokyo Keiki / Musasino Float Level Alarms

Technical Specifications

Compatibility

• Monitoring Systems: Kongsberg K-Chief, Nabtesco, Consilium, Emerson Damcos, Praxis Mega-Guard, Valmarine, Hyundai ACONIS.
• Pump Starters & PLC Controls: Direct wiring to marine magnetic motor starters (Schneider, Fuji Electric, Hyundai, Eaton) or 24V DC discrete inputs on Siemens S7, Omron Sysmac, and Mitsubishi MELSEC controllers.

Frequently Asked Questions

How does the Hanla FMS-E-1V-ES-T vertical float level switch work?

The Hanla FMS-E-1V-ES-T operates on magnetic repulsion and flux coupling. A stainless steel float containing an encapsulated permanent magnet rides up and down the vertical stem with the liquid level. As the magnet passes the internal switch position, its magnetic flux field passes through a non-magnetic barrier to actuate an internal snap-action microswitch, toggling the SPDT contacts without fluid contact.

What is the purpose of the “-T” suffix on this Hanla switch?

The “-T” suffix signifies an integrated manual test device (check lever). This allows marine engineers and class surveyors to manually actuate the float mechanism from outside the tank during routine safety surveys without introducing liquid into the tank or dismantling the mounting flange.

Can this level switch be used in heavy fuel oil (HFO) settling tanks?

Yes. With its all-stainless steel wetted assembly and maximum temperature rating of up to 180°C, the FMS-E-1V-ES-T handles heavy fuel oil, viscous sludges, and hot boiler water. For high-viscosity applications, routine verification using the manual test lever is recommended to prevent heavy bitumen buildup from impeding float travel.

Is the electrical contact SPDT or DPDT?

The standard FMS-1V designation features 1 x SPDT (Single Pole Double Throw) contact system (Common, Normally Open, Normally Closed) rated at 5A 250VAC. If dual independent alarms (such as high-level alarm and pump-cut) are required at different heights, the dual-point vertical model (FMS-2V series) is utilized.