Kongsberg GC-306-U1N Cargo Cabin Temperature Acquisition Unit (CTU)

Kongsberg GC-306-U1N Cargo Temperature Collection Unit (CTU) Detailed Explanation
I. Product Description
Brand: Kongsberg (Conseberg, the leading maritime measurement and control company in Norway)
Model: GC-306-U1N
Full Product Name: Cargo Temperature Unit (CTU) / Temperature Transmitter / Signal Converter
System: K-Gauge Liquefied Gas Ship Tank Measurement System (LNG/LPG Ship Tank Level, Temperature, Pressure Monitoring System)
Purpose: Specifically designed for multi-point temperature collection in liquefied gas transport ships (LNG ships, LPG ships), with safe signal isolation and conversion

 Core Hardware Specifications
Number of Temperature Channels: Up to 6 Pt-100 platinum resistance temperature sensors (1/10 grade high-precision temperature probes, capable of being immersed in low-temperature liquid cargo)
Explosion-proof and Certification
Intrinsic Safety Type Ex ia IIC T4 Ga, can be directly installed in the dangerous zone of the liquid cargo tank
Holds DNV, ship classification society ship type approval, meets liquefied gas ship operation specifications
Suffix U1N meaning: Represents the hardware firmware, wiring interface, and communication protocol of this version, compatible with GLK-300 signal processing unit (SPU), is a commonly used hardware version for existing LNG ships, the purchase spare parts model must fully match GC-306-U1N
Communication Interface: Through isolated RS485 bus, 6 temperature data is uploaded to the GLK-300 signal processing host in the safe area, then forwarded to the ship’s engine room monitoring / cargo control room operation terminal
Probe Compatibility: Equipped with Kongsberg mineral insulation armored Pt100 temperature measurement cables, can withstand low temperatures down to -165°C, suitable for LNG ultra-low temperature liquid cargo measurement

Main Functions
Low Temperature Temperature Signal Conversion
Converts the Pt100 resistance signal in the tank into a digital signal, achieving vertical multi-point temperature distribution monitoring in the cargo tank, used for:
Accurate calculation of liquid cargo volume (trade交接 measurement)
Monitoring liquid cargo stratification， rolling risks (LNG rolling will cause intense fluctuations in tank pressure， posing safety hazards)
Intrinsic Isolation
Built-in safety barrier isolation circuit， electrical isolation between the dangerous zone (cargo tank) and the safe zone (control room)， preventing electrical sparks from igniting flammable volatile gases.
Data Self-Check and Fault Reporting
Can detect probe breakage， short circuit， abnormal temperature exceeding limits， fault messages are uploaded to the cargo control system for alarm； each temperature measurement has its own calibration traceability， meeting the accuracy requirements for LNG trade交接.
Air Tight Partition Wall Connection
Equipped with cabin top sealing wiring connector to ensure tank gas sealing and prevent liquefied gas leakage.

 Typical Application Scenarios
LNG liquefied natural gas transport ships， LPG liquefied petroleum gas transport ships cargo tank temperature monitoring
The K-Gauge radar liquid level system on board is equipped with a multi-point temperature measurement sub-unit， used in conjunction with GLA-310 radar liquid level meter and GLK-300 processing unit
LNG storage tank temperature monitoring onshore (the ship version is more often used on sea vessels)

Electrical and Environmental Parameters
Power Supply： Powered by the intrinsic safety circuit of GLK-300 at the remote end， no need for local external power supply
Temperature Range： -165°C ~ +85°C
Protection Grade： IP66/IP67， can operate for a long time in a deck damp and salt fog environment
Operating Environment： Suitable for vibration， salt fog， and temperature fluctuation conditions of ships
Installation Location： Local wiring box on the cargo tank top / On-deck small cabinet

 Spare Parts and Maintenance Key Points
1. Product Status
The GC-306 series belongs to the old ship-based classic temperature measurement module， some original model models have been gradually updated； There are a large number of brand-new spare parts, disassembled repair parts and refurbished parts in circulation. The firmware version U1N cannot be mixed with other GC-306 sub-models at will. Otherwise, the SPU host may fail to recognize the channels and the temperature readings may be abnormal.