HANLA TMR-E-91A5S-GE-T Float Type Level Switch

HANLA TMR-E-91A5S-GE-T Float Type Level Switch

The HANLA IMS TMR-E-91A5S-GE-T is a magnetic reed float-type level switch engineered for cargo hold bilge wells, ballast tanks, void spaces, settling tanks, and industrial liquid sumps. Manufactured by HANLA IMS (Republic of Korea), this unit operates by utilizing a permanent magnet encapsulated inside a SUS316 float that travels along an internal guide pipe. As liquid rises and displaces the float, the magnetic field actuates a hermetically sealed reed switch positioned at a factory-calibrated switching elevation.

The TMR-E-91A5S-GE-T configuration integrates an explosion-proof / flameproof terminal housing rated to IP67/IP68, high-grade JIS 5K 125A SUS316 flange mounting, and an integrated mechanical manual test device (suffix -T). The test mechanism allows marine automation technicians and class surveyors to mechanically pull and actuate the float from the deck or flange exterior without opening the sump or pumping test water into the hold, satisfying SOLAS Chapter XII and IX regulatory requirements for cargo hold and bilge well high-level alarms.

Model Details:

• Manufacturer: HANLA IMS Co., Ltd.
• Full Part Number / MPN: TMR-E-91A5S-GE-T
• Standard Marine Tag Application: Cargo Hold Bilge Well High Level Alarm (LAH) / Engine Room Bilge Well LS
• Model Code Breakdown:
  • TMR: Top-mounted magnetic reed float switch series.
  • E: Explosion-proof / Flameproof enclosure design (ATEX/IECEx compliant junction box).
  • 91A5S: Specific stem length, stopper configuration, single/multi-point contact set, and SUS316 wetted component execution.
  • GE: General electrical terminal block with integrated cable gland entry.
  • T: Manual mechanical test lever/inspection device fitted on the terminal housing.

Compatibility

• Integrated Alarm & Monitoring Systems (IAMS / ICMS):
  • Kongsberg Maritime (K-Chief 500, K-Chief 600, K-Safe, Autochief C20)
  • Hyundai Heavy Industries Hi-MAPS / ACONIS-2000
  • Nabtesco / Nabco Engine Remote Control & Monitoring Systems
  • Wärtsilä / SAM Electronics NACOS Platinum Automation
  • Yokogawa Denshikiki Marine Alarm Consoles
• Intrinsically Safe Galvanic Isolators & Barriers:
  • MTL (MTL5500 / MTL7700 series shunt-diode and switch isolator barriers)
  • Pepperl+Fuchs K-System switch amplifier modules (e.g., KFD2-SR2-Ex1.W)
  • Phoenix Contact MACX MCR-EX series isolators

Applications

• Bulk Carrier & Container Cargo Hold Bilge Wells: Acts as a primary cargo hold water ingress detector and bilge well LAH (Level Alarm High) under SOLAS Reg XII/12 and IMO MSC.188(79).
• Engine Room Bilge Wells & Drain Wells: High-level detection of oily water accumulations ahead of oily water separator (OWS) or bilge transfer pumps.
• Double Bottom Void Spaces & Cofferdams: Continuous perimeter monitoring against hull breaches and pipe fracture flooding.
• Fuel Oil, Lube Oil & Sludge Service Tanks: Low and high level safety trips on settling tanks, drain tanks, and waste oil reservoirs.
• Sewage & Grey Water Collection Holding Tanks: Auto-start/stop cycle control for marine vacuum sewage systems and discharge valves.

Frequently Asked Questions

What is the primary purpose of the manual test device (-T suffix) on the HANLA TMR switch?

The mechanical test rod allows an operator to pull the internal float mechanism upward from the outside of the tank or hold without opening the manhole cover. This triggers a live electrical contact actuation, validating the circuit loop, safety barrier, and alarm monitoring system during routine safety inspections and port state control (PSC) audits.

Can the HANLA TMR-E-91A5S-GE-T level switch be used in explosive gas atmospheres?

Yes. The unit features an explosion-proof terminal enclosure (certified under DNV ATEX and IECEx). When installed in hazardous locations—such as cargo holds, pump rooms, or fuel oil handling areas—it is connected via approved intrinsic safety (IS) galvanic barriers or installed using certified Ex d cable glands.

How do I troubleshoot a stuck high-level alarm on this switch?

First, operate the manual test lever to verify if the float moves freely and returns to the bottom position via gravity. If the float moves freely but the alarm does not reset, disconnect the terminal block wiring and measure contact continuity across terminals 1 and 2 using a multimeter. If continuity indicates closed when the float is resting at the bottom stop, the internal reed switch has either suffered contact weld from current overload or the float has suffered internal ingress.

Does the switch operate on 110V or 220V AC mains?

While the reed contact is rated up to 250V AC, good marine engineering practice and classification societies dictate running float switches through low-voltage 24VDC loops or intrinsically safe barriers to avoid running lethal high voltages into wet cargo spaces and bilge wells.

Is the JIS 5K 125A mounting flange standard for cargo hold bilge wells?

Yes. Japanese Industrial Standard (JIS) 5K 125A is one of the most widely adopted flange patterns across Far East shipbuilders (South Korea, Japan, China) for cargo hold bilge well access standpipes and trunk penetrations.