Shuipbuilding & Offshore Industries

Liquid Level Contents Gauges

Accurately Measure the contents Inside your tank or vessel

'See the tru' level, even under the most severe conditions

Serving the Marine Industry for over 70 years

Manufactured & supported by an organisation the cares

Shipbuilding & Offshore Industries

Liquid level gauges are essential tools for monitoring and controlling the levels of liquids in tanks and containers in the shipbuilding, marine, and offshore industries. These gauges are used in a variety of applications, including:

  • Fuel storage tanks
  • Ballast tanks
  • Bilge tanks
  • Water storage tanks
  • Hydraulic oil tanks
  • Lubrication oil tanks
  • Chemical storage tanks


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Seetru liquid level gauges are widely used in the shipbuilding and offshore industries for a variety of reasons. They are highly accurate, reliable, and durable, making them ideal for use in harsh and demanding environments. Seetru gauges are also available in a wide range of sizes and configurations to meet the specific needs of each application.

One of the most popular Seetru gauges for the shipbuilding and offshore industries is the G21 Tubular Marine Gauge. This gauge is designed for use with non-flammable liquids, such as water and coolant. It is commonly used for water storage and coolant tanks on board cargo ships, tugs, and military vessels.

For flammable liquid applications, Seetru offers the G35 Seemag and G31 Seeflex gauges. These gauges are type approved by many worldwide shipping authorities, including Det Norske Veritas (DNV), RINA, Lloyds Register of Shipping, Nippon Kaiji Kyokai, and Bureau Veritas. They are commonly used for fuel oil, hydraulic oil, and lubrication oil tanks of cargo ships and work boats.


Product Showcase

The Seetru G35 Seemag Magnetic Gauge

The Seetru Seemag® tank content indicator or gauge is a high-quality yet economical magnetic level indicator. Its unique design offers considerable advantages over conventional magnetic gauges including accurate step-less reading with all-round visibility and the option of high/low-level alarms with remote digital reading.

The Seemag gauge meets the requirements of SOLAS (Safety Of Lives At Sea). It is also type approved by many worldwide shipping authorities including Det Norske Veritas (DNV), RINA, Lloyds Register of Shipping, American Bureau of Shipping (ABS), and Germanischer Lloyds.

Magnetic bypass design
The gauge utiliswes a marker strip on a movable carriage fitted on the outside of a stainless steel tube, which by way of magnets moves up and down in unison with a float inside the tube. The marker strip is adjustable to suit the specific gravity of the liquid to be measured.

Ease of installation and maintenance
The Seemag liquid level gauge can be provided with a variety of end fittings to customer requirements. These include stub pipe for welding, ball valves, and flanges. The gauge is fitted with blanking plugs at the top and bottom of the gauge column. These can be easily removed to allow cleaning of the gauge column.

Tank calibration
A scale plate graduated in mm is incorporated into the Perspex front cover of the Seemag gauge. Other scale plates can be supplied graduated to customer requirements.

Tank connection
Seemag gauges are closed-circuit design and both the top and bottom of the gauge are fitted to the tank.

Alarms and electronic/digital outputs
Options available include electronic high and low-level alarm sensors, continuous electronic read-out signals and displays as well as a digital data feed for direct computer interfaces and digital control systems.

Heating system for high-viscosity liquids
We are pleased to offer Steam Heating and Electric Heating and Thermal Oil Heating for our Seemag magnetic gauge. This heats the tube to allow the measurement of viscous fluids, such as heavy fuel oils on ships.


View Technical Information for the G35 Seemag Magnetic Gauge

Liquid Level Gauges for Shipbuilding & Offshore Industries

We have the following Liquid Level Contents Gauges For Ship Building & Offshore use, the G35 and G31 models meet the requirements for SOLAS for use on flammable liquids, they are type approved by Lloyds, DNV, and Rina amongst others.

  • G35 Seemag- Magnetic Gauge – Type approved for use on flammable Liquids
  • G31 Seeflex – Flat Glass Reflex Gauge – Type approved for use on flammable Liquids
  • G21 Marine – Tubular gauge
  • G20 Admiralty – Tubular gauge
  • G22 Quickmount -Tubular gauge
  • G32 Quickflex – Flat Glass Reflex gauge

Liquid Level Gauges for Shipbuilding, Marine, and Offshore

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Our sales engineers here at Seetru Limited have extensive knowledge and experience of safety valve selection and sizing. We recommend that you contact our team to discuss your requirements.