The SAAB Marine LI Transmitter Interface 9150 064-632A is a critical interface component widely utilized in marine tank gauging and cargo monitoring systems. Designed for high reliability in harsh maritime conditions, this unit processes signals from level transmitters and facilitates communication between sensor hardware and the ship’s centralized control or monitoring systems.
Product Specifications
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Manufacturer: SAAB Marine (now part of Emerson / Rosemount)
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Model Number: 9150 064-632A
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Product Type: Transmitter Interface Module (LI – Level Interface)
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Dimensions: 180 mm x 120 mm x 60 mm
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Weight: 0.8 kg
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Origin: Sweden
Application Areas
This interface is primarily used in commercial shipping and offshore industries. Key applications include:
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Cargo Tank Monitoring Systems (CTMS).
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Level measurement signal conditioning for liquid cargo and ballast tanks.
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Integration with Radar Level Gauges (e.g., Saab TankRadar systems).
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Interface conversion between legacy sensor outputs and modern digital bus protocols.
Product Usage Instructions
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Safety First: Before installation or removal, ensure that the system is isolated from the power supply and that the area is clear of hazardous gases, particularly if the transmitter is located in a tank zone.
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Mounting: The unit is typically DIN-rail mounted or installed within a protected junction box. Ensure it is secured in a vibration-dampened environment to prevent mechanical stress on internal circuitry.
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Wiring: Terminate the input signal wires from the level transmitter and the output signal lines to the processing unit according to the pinout diagram specified in the manufacturer’s manual.
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Configuration: Verify that the jumper settings or software dip-switch configurations match the required input signal type (e.g., 4-20mA, digital bus, or frequency) before applying power.
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Initialization: Once powered, check the onboard LED status indicators. A steady green light usually confirms normal operation, while flashing red codes indicate specific communication or sensor faults.

Q&A
What is the purpose of the 9150 064-632A? It acts as an intermediary bridge that conditions and isolates signals coming from tank level sensors, ensuring that the control system receives clean, accurate, and protocol-compatible data. Can I replace this unit while the system is active? It is highly discouraged. Always follow the lockout/tagout procedures established for your vessel’s safety protocols before opening the housing or disconnecting wires. How do I identify a faulty interface? If the central monitoring system reports a “sensor timeout” or “invalid signal” for a specific tank, use a multimeter to check for stable power supply to the module and verify that the input signal from the transmitter is within the expected range. Is this compatible with newer Rosemount systems? Yes, as Saab Marine became part of the Rosemount group, many of these interface modules have transition paths, but you must check your specific system revision to ensure signal compatibility.
Recommended Similar Models
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Saab/Rosemount 9150 Series Interface Modules
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Rosemount 5900S Series Radar Level Gauges
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Emerson TankRadar Pro Interface Units
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VegaVegapuls Signal Conditioners
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Endress+Hauser Tank Gauging Interfaces

