KONGSBERG GT300 pressure transmitter

Industrial application and technical advantages of KONGSBERG GT300 pressure transmitter

Pressure transmitters, as the "sensory nerves" of industrial control systems, are widely used in fields such as water conservancy and hydropower, shipbuilding, petrochemicals, and intelligent buildings. In harsh industrial environments, sensors not only face corrosion of the medium and pressure shocks, but also need to maintain long-term stable output under various temperature conditions. Although traditional diffusion silicon pressure transmitters have high sensitivity, they usually rely on filling liquid (silicone oil) to transmit pressure, which to some extent introduces measurement errors caused by thermal expansion or leakage.

As a globally renowned supplier of maritime and high-end industrial technology, Kongsberg Maritime's GT300 series pressure transmitters completely break free from the constraints of filling fluids by using dry ceramic capacitor/piezoresistive technology, achieving higher accuracy and environmental adaptability. This article will provide a detailed interpretation of the product from three dimensions: technical specifications, core design, and application scenarios.

Chapter 1: Product Overview and Application Positioning

1.1 Precise positioning of universal design

The GT300 pressure transmitter is defined as a general purpose transmitter, primarily designed for engine rooms, hydraulic stations, and similar industrial applications. It offers two forms of gauge pressure and sealed gauge pressure, covering a wide range of needs from micro pressure to high pressure.

1.2 Range and Output

This series supports a pressure range of up to 100 bar and adopts the industry standard 2-wire connection method, with output signals ranging from 4 to 20mA analog. This signal system has strong anti-interference ability and is suitable for long-distance transmission, making it a classic choice for industrial sites. Its nominal power supply value is 24 VDC, allowing for fluctuations within a wide voltage range of 12 to 32 VDC, greatly facilitating compatibility with different ship or factory power supply systems.

Chapter 2: Core Technology Innovation: Dry Ceramic Sensors

The most significant technical feature of the GT300 is its pressure sensitive element - a dry measurement unit made of 96% alumina (Al ₂ O3) ceramic.

2.1 Material advantage: 96% alumina ceramic

Alumina ceramics are widely recognized as highly elastic, corrosion-resistant, and wear-resistant materials. The GT300 uses 96% pure ceramic film, which has extremely high chemical inertness and can withstand the corrosion of most chemical media. This means that the measured process medium can directly contact the measuring diaphragm, without the need to transmit pressure through stainless steel isolation diaphragm and intermediate filling liquid (such as silicone oil) like traditional sensors.

2.2 Technical differentiation between wet and dry methods

In traditional "wet" sensors, the filling fluid is both a pressure transmission medium and a potential source of error. When the ambient temperature changes, the thermal expansion and contraction of the filling liquid will cause a volume change, thereby introducing temperature drift errors. In addition, if the isolation membrane is damaged and the filling liquid leaks, it will cause the sensor to completely fail. The "dry" design of GT300 fundamentally eliminates these issues, which explains why it can surpass traditional analog sensors in temperature stability indicators.

2.3 Signal Conversion and Digital Compensation

The internal core of GT300 is a rigid structure composed of ceramic membrane and insulating substrate. Strain gauges connected in the form of Wheatstone bridges are integrated on the membrane. When pressure is applied, the small deformation of the diaphragm causes a change in the resistance value of the strain gauge, which is converted into an electrical signal.

The revolutionary breakthrough of GT300 lies in its digital compensation process:

Individualized calibration: Each sensor undergoes dual scanning of pressure and temperature during the manufacturing process.

Table lookup compensation: The collected data is digitized and stored in the built-in memory of the sensor, forming a unique 'Tabular'.

Real time calibration: During operation, the microprocessor combines real-time temperature and pressure signals to perform linearization and temperature compensation calculations based on this table.

This digital compensation technology based on the unique characteristics of each component enables the GT300 to achieve accuracy and stability far ahead of analog sensors in the compensation temperature range of 0 to 60 ° C, ultimately ensuring a full-scale output accuracy (FRO) of 0.5%.

Chapter 3: Mechanical Structure and Material Technology

3.1 Shell and Protection

The main structure of GT300 is made of AISI 316L stainless steel. 316L is a low-carbon, molybdenum containing austenitic stainless steel with excellent resistance to intergranular corrosion, especially chloride ion corrosion, making it very suitable for ships and offshore environments. Its protection level reaches IP56, which means it can prevent dust (dust level 5, no harmful deposits) and strong water spray, sufficient to cope with the flushing and humid environment inside the cabin.