Integrated Marine Tank Gauging System

DTGS – Marine Tank Level Monitoring Made Easy

Designed for smaller vessels, and providing electronic measurement with a centralised display, the Digital Tank Gauging System (DTGS) is a packaged marine tank level monitoring system offering clear accuracy and functional advantages compared to mechanical and visual level gauges.

A Tank Gauging System That is Cost-Effective and Simple to Operate

The DTGS offers a complete tank monitoring system with remote display options and simple cabling. A real-time display with history logging means remote tank monitoring has never been easier.

Where required, parts are certified for installation in a hazardous area and approved by major classification societies for use in marine applications. They are suitable for fuel, lube oil, water, bilge and ballast level tanks.

The DTGS allows the benefits of electronic measurement transmitters and centralised display with alarm handling to be used for fuel and service tanks, but at a reduced cost compared to a radar based inventory systems or transmitters connected to a PLC running custom software.

Each DTGS marine tank gauging system can be configured to the application, based on the actual number, size and type of tanks to be measured, and provides a system which offers clear accuracy and functional advantages compared to mechanical and visual level gauges.

What is the use of density meter?

A comprehensive quality assurance covering the entire pro duction process is a must in any industrial sector. Density meter are frequently used for this purpose, especially in the pharmaceutical, chemical, petrochemical as well as the food and beverage industry. They allow the manufacturer to analyse raw materials, semi-finished and finished products as well as the manufacturing steps in terms of a number of factors.

Density meter can be used to identify substances, to determine their quality or purity and to measure their concentration in binary or quasi-binary mixtures. Substance conversions and reaction dynamics can also be inferred from it. In combination with other methods such as refractometry that measures the refractive index of substances, the density meter allows you to make precise statements about the quality of each step of the production process. This requires that the measured samples are kept at an exact temperature as the density meter depends strongly on the temperature. A change by 0.1 °C would mean a de viation of the measurement value between 0.0001 and 0.0003 g/cm³.

However, reliable measurement results are not enough in today’s general economic conditions. The ever increasing cost and efficiency pressure calls for density meter measurement solutions that can be easily integrated into any production process, manage with very little sample volumes and deliver fast results. Of the three density meter measurement methods used nowadays – the areometric, pycnometric and oscillating U-tube method –, the latter method best meets these requirements.

Tank gauge with LTD-level temperature and density

The tank gauge with LTD-level temperature and density employs the Frequency Modulated Continuous Wave (FMCW) principle. A frequency sweeping microwave signal is emitted by the Radar through a stand pipe. The distance is derived from the time delay of the reflected signal from the liquid surface. The stand pipe is delivered to match the total tank height. The pipes have ventilation holes allowing the vapour pressure inside and outside the pipe to stabilize, thus allowing the liquid to rise or fall unimpeded in the pipe.

The electronic unit in the tank gauge with LTD-level temperature and density includes a unique signal detection method that ensures optimum performance. Combined with its superb signalto- noise ratio, GLA-310/F offers a high measurement reliability and accuracy.

Each tank gauge with LTD-level temperature and density is connected to a dedicated signal processing unit, which includes the processing of radar microwave signals and the intrinsically safe interface to the instruments located in hazardous area.

STG Servo Tank Gauge

The servo tank gauge is an intelligent tank gauge for high accuracy liquid level measurement. The servo tank gauge can also determine the interfaces between three liquids, specific gravity of these liquids and tank bottom. All calibration and operating functions can be made via the user friendly Matrix program and touch sensitive keypad.

  • Output signals: RS-485, MODBUS, Mark Space and Enraf BPM protocol.
  • Suitable for atmospheric & high pressure applications up to 363 psi.
  • FM, ATEX & CSA approved for use in hazardous areas.
  • NMI approved for custody transfer applications.
  • Measures liquid to an accuracy of +/- 0.7 mm.

How do you calibrate a level gauge?

Calibrating a capacitive level gauge is quick and easy, and can be done in six steps. Before calibrating your capacitor, take inventory of the buttons and hardware, to first familiarize yourself with the buttons and display you’ll be monitoring.

Step 1: Press “Up” Buttons

To begin calibrating your capacitive level gauge, the first step is to connect the loop power supply and ammeter to “plus” and “minus”, and then connecting the other end to the calibrator. Press both “up” buttons, holding down for 3 seconds, then let go.

Step 2: Press ”Down” Buttons

Next, the level gauge will have to be placed in calibration mode. To do this, press both “down” buttons, holding for 3 seconds again, and let go. At this stage, there should be no water on the level gauge.

Step 3: Press “Z” Until You Reach 4mA

Now, the level gauge should be calibrated at its zero point. This is the low scale, and shows as 4mA. To reach this level, press down on the “Z” button until the display reaches 4 mA.

Step 4: Raise Water Level

Once the device gets to 4mA, fill the column with water, so that it can reach the high level of the level gauge. This is known as the “reference water”.

Step 5: Adjust Span to Indicate 20mA

After the water reaches the top of the column, it is time to get the appropriate, full scale reading of the level gauge, at 20mA. To do so, press the “S” buttons until the device reaches 20mA.

Step 6: Verify Low Water Level Is 4mA

Finally, return the water level to zero, to verify that the low water level is reading at 4mA.