PRESSURE TRANSMITTER
KONGSBERG
New product
The KONGSBERG GT404D4H25T is a marine pressure transmitter from the Kongsberg GT404 family, designed for demanding shipboard pressure measurement applications.
The unit photographed by SM MARINE SERVICE™ is clearly marked:
Type: GT404D4H25T
Serial No.: 175536
CE: 2460
Ex Marking: II 1G Ex ia IIC T6 Ga
IECEx: PRE 20.0103X
The construction visible in the stock photograph includes a stainless-steel transmitter body, electrical cable entry and a large flange-mounted sensing assembly.
Kongsberg officially describes the GT404 as a type-approved marine pressure transmitter specifically developed to measure pressure on cargo lines and manifolds.
The KONGSBERG GT404 converts process pressure into an electrical signal that can be transmitted to the vessel's monitoring, cargo-control or tank-gauging system.
Unlike a simple local mechanical pressure gauge, the transmitter enables pressure information to be monitored remotely by the ship's electronic control and monitoring system.
Kongsberg's GT404 design uses a dry ceramic pressure-sensing element with an internal strain-gauge Wheatstone bridge. Individual sensor characteristics are digitally stored and compensated for pressure and temperature, helping provide stable measurement performance.
The GT404 is particularly relevant to tankers and other vessels requiring continuous monitoring of cargo line or manifold pressure.
Kongsberg's integrated cargo-system documentation identifies the GT404 specifically as a cargo line and manifold pressure transmitter.
Typical marine applications therefore include:
Cargo Line Pressure Measurement
Continuous monitoring of cargo pipeline pressure during cargo handling.
Cargo Manifold Pressure Measurement
Monitoring pressure around the vessel's cargo manifold during loading and discharge operations.
Cargo Monitoring Systems
Providing pressure information to compatible vessel monitoring and cargo-control equipment.
Tanker Applications
Suitable GT404 configurations can be used in hazardous marine areas where intrinsically safe equipment is required.
According to Kongsberg's current official GT404 documentation, the family provides the following characteristics:
| Specification | KONGSBERG GT404 Family |
|---|---|
| Product | Marine Pressure Transmitter |
| Application | Cargo Line / Manifold Pressure |
| Measuring Range | 0.6–40 bar, depending on configuration |
| Output | 4–20 mA with HART |
| Nominal Supply | 24 VDC |
| Permitted Supply | 12–32 VDC depending on load |
| Body | AISI 316L Stainless Steel |
| Membrane | AISI 316L, Teflon coated |
| Active Membrane | 59 mm |
| Process Flange OD | 98 mm |
| Flange Mounting | 6 × M6 screws |
| Accuracy | 0.90% FRO |
| Temperature Drift | <0.01% FRO/°C |
| Compensated Range | 0–60°C |
| Operating Temperature | -45°C to +85°C |
| Long-Term Drift | <0.3%/year |
| HART | Compatible |
These are GT404-family specifications from Kongsberg, not a claim that every ordering-code variant has identical pressure range, gland or Ex configuration.
Cargo service can expose a transmitter to residues and pressure shocks.
Kongsberg therefore uses a Teflon-coated AISI 316 stainless-steel diaphragm on the GT404. The official documentation explains that the wide diaphragm helps reduce cargo-residue buildup, while an internal restrictor helps protect the sensing element against pressure shocks.
This construction is one reason the GT404 is particularly suited to marine cargo-line and manifold service.
The GT404 provides a 4–20 mA output with HART, allowing the measured pressure to be communicated to suitable monitoring equipment. Kongsberg specifies a nominal 24 VDC supply, with allowable supply variation depending on circuit load.
The current Lloyd's Register type approval for the GT404 family also identifies 24 VDC supply and 4–20 mA / 2-wire HART output.
This gives us several useful search terms for this product:
Kongsberg HART Pressure Transmitter • Kongsberg 4–20mA Pressure Sensor • Marine 2-Wire Pressure Transmitter • Cargo Line Pressure Sensor • Cargo Manifold Pressure Transmitter
This is particularly important for tanker applications.
Kongsberg's current GT404 documentation includes hazardous-area configurations with intrinsic-safety certification. The official datasheet lists an Ex classification of II 1 G Ex ia IIC T5 Ga for the documented GT404 configuration and specifies safety parameters for intrinsically safe use.
Your actual photographed GT404D4H25T carries its own visible Ex marking:
II 1G Ex ia IIC T6 Ga
and:
IECEx PRE 20.0103X
Therefore, when replacing this exact unit, the complete type code and certification marking on the existing transmitter must be checked. We should not substitute the generic datasheet's T5 marking for the photographed unit's T6 marking.
This distinction is very important for SEO and for buyers.
Your exact stock unit is:
Google results also prominently show the closely named:
The GT404D3H25T is publicly listed as a Kongsberg pressure transmitter, and marine-market listings describe examples with a 25 bar range.
For this reason, both exact model searches are valuable in our Meta Keywords.
However:
GT404D4H25T and GT404D3H25T should NOT automatically be considered interchangeable.
The complete ordering code, pressure range, electrical configuration, Ex approval and installation requirements must be checked before replacement.
Kongsberg's current marine pressure-transmitter portfolio also includes several related families:
GT300 – general-purpose engine-room pressure transmitter.
GT301 – compact engine-room pressure transmitter suitable for side-by-side/rack mounting.
GT402 – marine pressure transmitter with gauge and absolute pressure configurations.
GT403 – submersible marine pressure transmitter used for applications including ballast/bunker tank level, pump pressure, draft, trim and list measurement.
GT404 – cargo line and manifold pressure transmitter.
GT405 – pressure transmitter for marine and offshore applications where precision and long-term stability are required.
Kongsberg's type approval documentation also covers the GT406, while Kongsberg identifies GT420, GT422 and GT423 as related differential-pressure transmitter products.
These model names are useful related-family keywords, but they are different products and should not be represented as direct replacements for GT404D4H25T without engineering verification.
A pressure transmitter can appear faulty because of either the transmitter itself or problems elsewhere in the measurement loop.
Common symptoms include:
No 4–20 mA output – Check loop power, wiring, terminals, cable continuity, barriers and monitoring-system input.
Incorrect or unstable pressure reading – Check actual process pressure, electrical connections, grounding, diaphragm condition and whether cargo residue has affected the process interface.
Reading fixed at minimum or maximum – Inspect the loop, input channel and transmitter before assuming sensor failure.
Reading differs from local pressure gauge – Compare against a known calibrated reference and check the complete measurement installation.
Intermittent signal – Inspect cable gland, shielding, connections and associated barrier/interface equipment.
Visible contamination around diaphragm – Follow approved vessel procedures before inspecting or cleaning the process-facing surface.
Kongsberg specifies screened twisted-pair wiring and gives grounding requirements for the transmitter circuit. For Ex-area installations, all intrinsic-safety requirements must also be observed.
A cargo-line pressure transmitter must never simply be removed from a pressurized system.
Kongsberg's official GT404 documentation specifically states that the system must be depressurized before assembly of the pressure transmitters. Hazardous-area work must also follow the applicable vessel procedures and Ex installation requirements.
For replacement, confirm:
Full Type Code → Pressure Range → Ex Certification → Process Connection → Electrical Connection → Output → Vessel/System Compatibility
before installation.
SM MARINE SERVICE™ supplies and sources KONGSBERG marine pressure transmitters, pressure sensors, pressure transducers and marine automation spare parts for international vessel operators and marine service companies.
The photographed KONGSBERG GT404D4H25T is a particularly useful reference for buyers searching by the exact transmitter type.
Depending on current stock and sourcing availability, equipment can be offered in:
New • Used • Refurbished • Reconditioned • Tested Working Condition
For inquiries involving GT404D4H25T, GT404D3H25T or another GT404 configuration, send the complete nameplate photograph rather than only writing “Kongsberg GT404.” Small differences inside the ordering code may represent important configuration differences.
It is a type within the Kongsberg GT404 marine pressure-transmitter family. The GT404 family is specifically designed for measuring cargo-line and cargo-manifold pressure aboard vessels.
The official Kongsberg designation is Pressure Transmitter. However, buyers commonly search terms such as pressure sensor and pressure transducer, which describe the broader measurement function.
Yes. Kongsberg specifically designs the GT404 for maritime applications, particularly cargo-line/manifold pressure measurement.
Yes. Current Kongsberg documentation specifies 4–20 mA with HART for the GT404 family.
The official datasheet specifies 24 VDC nominal, with a 12–32 VDC range depending on load. Intrinsically safe installations have additional restrictions.
They are closely related GT404 type codes, but they should not be assumed to be identical or interchangeable. Match the complete type code and technical configuration before ordering.
Certified GT404 configurations are available for intrinsically safe hazardous-area installations. The exact Ex marking on the individual transmitter must be checked.
SM MARINE SERVICE™ supplies and sources Kongsberg marine pressure transmitters and related marine automation equipment for worldwide customers. Contact us with the exact model, nameplate photograph and required quantity.
KONGSBERG GT404D4H25T Marine Pressure Transmitter / Pressure Sensor for cargo-line and cargo-manifold pressure measurement. Part of the Kongsberg GT404 marine transmitter family featuring rugged stainless-steel construction and pressure measurement for demanding shipboard applications. GT404 and related Kongsberg marine pressure transmitter spare parts available from SM MARINE SERVICE™ in New, Used, Refurbished and Reconditioned condition with worldwide shipping and technical support.
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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