Kongsberg Inelteh ITHLA-2-GL7200 Magnetic Level Switch Sensor

Kongsberg Inelteh ITHLA-2-GL7200 Magnetic Level Switch Sensor (Length: 500/660 mm)

The Kongsberg Inelteh ITHLA-2-GL7200 is a dual-point magnetic float level switch engineered for cargo tank high-level (typically 95%) and overfill alarm (typically 98%) applications on crude oil, chemical, and product tankers. Manufactured by Inelteh for integration with Kongsberg Maritime cargo monitoring systems (including GL-7 and GL-7200 high-level alarm consoles), this sensor provides fail-safe, mechanical-to-electrical level trip points via hermetically sealed reed contacts actuated by a permanent magnet encapsulated inside a high-buoyancy AISI 316L stainless steel float.

The ITHLA-2-GL7200 operates as a certified simple apparatus inside hazardous Zone 0 / Zone 1 cargo spaces. Built-in end-of-line (EOL) and contact resistor networks enable the central alarm processor to perform continuous circuit integrity loops—instantly identifying line breaks, open loops, or dead short-circuits across the signal wiring.

Model Details

• Manufacturer: Inelteh d.o.o. (Croatia) / Integrated by Kongsberg Maritime
• Series: ITHLA Dual-Point High & Overfill Alarm Series
• Model Code: ITHLA-2-GL7200
• Manufacturer Part Number (MPN): ITHLA-2-GL7200-500/660
• Stem Configuration: Dual switching points (High Alarm / Overfill Alarm)
• Effective Probe / Immersion Length: 500 mm (High Level / Point 1) to 660 mm (Overfill Level / Overall Stem Length)

Technical Specifications

Features

1. Dual-Level Independent Safety Points: Houses two isolated reed switch assemblies within a single 316L stainless steel stem to independently signal 95% High Level and 98% Overfill scenarios.
2. Corrosion-Resistant AISI 316L Construction: Wetted stem, stops, and precision float body are fabricated from high-grade marine acid-resistant stainless steel for maximum chemical cargo resistance.
3. Active Line Monitoring Resistor Network: Integrated loop-monitoring resistors permit constant line-break and short-circuit verification by the supervisory processing unit.
4. Integrated Manual Mechanical Test Facility: Equipped with an integrated manual lift/test rod assembly allowing crew to lift floats externally on deck prior to loading operations without opening cargo containment.

Applications

• Oil & Chemical Tanker Cargo Overfill Systems: Primary sensor for secondary independent overfill protection (SOLAS II-2/Reg. 59, IMO MSC Circ. 1291, and USCG 46 CFR Part 39).
• Slop & Waste Oil Holding Tanks: Dual-alarm monitoring on hazardous slop, drain, and bilge holding tanks.
• FPSO & Offshore Storage Facilities: Harsh environmental deck installations requiring IP66/68 ingress protection against direct sea boarding and chemical vapors.
• Fuel Oil Settling & Service Tanks: Level alarm escalation for heavy fuel oil (HFO), marine gas oil (MGO), and auxiliary bulk chemical tanks.

Compatibility

• Kongsberg Maritime: GL-7 High-Level Alarm System, GL-7200 Cargo Monitoring Rack, K-Gauge, and Autronica GLK-series systems.
• Inelteh Integrated Systems: ITDAC-14B Alarm Units, ITHLA-26 Modules, and Inelteh Standalone Solar-Powered Overfill Units.
• Third-Party Marine Alarm Consoles: Compatible with all monitoring systems utilizing certified switch amplifier barriers (Pepperl+Fuchs KFD2-SR, GM International D1031Q / D5030, Stahl 9170 series) configured for line-fault detection.

Part Number Cross-References

• Inelteh P/N: ITHLA-2, ITHLA-2/C, ITHLA-2/92, ITHLA-2-500/660
• Kongsberg Maritime P/N: GL7200-ITHLA-2, 500-660-ITHLA-2, KM-ITHLA-2-GL7200
• Functional Equivalents: Emerson Rosemount TankRadar TLA / HLA series, Scanjet SC 44 series, Pleiger SLS series dual magnetic float switches.

Frequently Asked Questions

What does the 500/660 mm dimension specify on the ITHLA-2-GL7200?

The dimensions denote the functional insertion depths of the guide tube. 500 mm specifies the actuation distance from the mounting flange face to the first trip stage (95% High Level Alarm), while 660 mm represents the lower boundary or total overall stem length providing the secondary 98% Overfill Alarm trip point relative to the tank coaming geometry.

How does the ITHLA-2 sensor differentiate between an actual alarm and a broken wire?

The switch utilizes built-in passive resistors arranged in series and parallel with the magnetic reed contacts. The safe-area control rack (such as an Inelteh ITDAC-14B or Kongsberg GL-7200) measures small variations in loop current. A normal condition has a known baseline resistance, an alarm condition produces a distinct reduced resistance, and a severed cable or dead short yields zero or open loop, tripping a dedicated “Loop Fault” alert.

Can the Kongsberg Inelteh ITHLA-2-GL7200 be tested without filling the cargo tank?

Yes. It features a built-in mechanical test device accessible outside the tank coaming on the upper housing. The ship’s crew can lift the internal test mechanism to elevate the float magnetically, triggering the 95% and 98% audio-visual alarms at the central console and deck horns to confirm full regulatory compliance prior to cargo operations.

Is this unit compatible with hazardous cargo vapors like Benzene and volatile crude?

Yes. The wetted parts are 100% AISI 316L stainless steel, resistant to hydrocarbons, aromatics, and standard chemical tanker cargoes. Electrically, the switch contains no energy-storing components and qualifies as a simple apparatus, approved for Zone 0 installation when paired with certified intrinsic safety barriers.

Can I replace an existing single-point ITHLA-1 switch with this dual-point ITHLA-2?

Mechanical replacement is straightforward if the deck flange pattern matches (standard DN100 or 92x92mm square). However, an additional intrinsically safe wiring pair must be pulled from the deck junction box to the alarm processing cabinet to handle the independent secondary overfill alarm channel.