Marine Water Tank Level Sensors have always been an important part of the marine tank monitoring system. There are many places on ships where water levels need to be detected. Such as fuel, fresh water and sewage storage tanks. The liquids in these tanks are a critical resource for ship operations and require constant monitoring to ensure supply and appropriate storage. For example, the water level in the water storage tanks and pipelines of the fire protection system also needs to be monitored to ensure that there is sufficient water supply in an emergency. Even equipment that handles seawater, sewage or other waste liquids needs to monitor water levels to ensure proper operation of the equipment.

Marine Water Tank Level Sensors

What are Marine Water Tank Level Sensors?

Marine Water Tank Level Sensors are specially designed to measure the water level inside ships. For example, in fresh and drinking water as well as gray water or waste water storage tanks on ships, Marine Water Tank Level Sensors can detect liquid levels from very low to very high.

Marine Water Tank Level Sensors generally use capacitive, hydrostatic, or radar measurement technologies. Convert the water level into an analog signal and then transmit it to the marine tank monitoring system. To effectively monitor, record and control the liquid level in the tank. And the sensors are often used in conjunction with alarm systems to alert users when the level in the tank reaches a certain level.

marine tank monitoring system

Marine Tank Monitoring System is a system used on ships to monitor the liquid levels of various storage tanks (such as oil, fresh water, sewage, etc.) in real time. It is an important part of ensuring the safe and efficient operation of ships.


In addition to monitoring water levels, other liquid levels also need to be monitored on ships. The installation of liquid level measurement and alarm systems on oil tankers and chemical ships is to monitor cargo tanks and other oil and water tanks. On the one hand, by measuring the liquid level, the crew can keep track of the various conditions of the ship during navigation to ensure the best loading of the ship. More importantly, it is to prevent the liquid level from being too high and causing overflow. To avoid causing fires and contaminating the surrounding marine environment.

The following are some basic features and components of the system:

  • Function:
    • Monitor the liquid level in the storage tank in real time.
    • Record and analyze liquid level data.
    • Sounds an alarm when the liquid level exceeds the preset range.
    • Sometimes other parameters such as temperature and pressure of the storage tank can also be monitored.
  • Sensor:
    • The liquid level sensor is the core component and can be float type, capacitive type, radar type, pressure type, etc.
    • As needed, it may also include temperature sensors, pressure sensors, etc.
  • Display and control terminal:
    • Usually located in the control room or bridge of the ship, it is used to display the liquid level information of each storage tank in real time.
    • Allows operators to set alarm thresholds, view historical data, and more.
  • Correspondence:
    • Communication is required between the sensors and control terminals within the system, which may be wired (such as RS485, Ethernet) or wireless.
    • In more advanced systems, remote monitoring capabilities may also be provided, allowing a land-based management center or other vessel to obtain data in real time.
  • Data processing and storage:
    • Systems will typically include a data processing unit to receive, process and store data collected from sensors.
    • Facilitate subsequent analysis, statistics and reporting.
  • Power and backup:
    • Considering the particularity of ship power supply, the system usually has its own power module with battery backup to ensure that it can still work normally in the event of a short-term power interruption.
  • Alarm function:
    • When the liquid level exceeds the preset safety range, the system will automatically send out an audible and visual alarm to remind the operator to handle it in time.

Marine Water Tank Level Sensors is important for better tank monitor

Through the above introduction, you should have understood that Marine Water Tank Level Sensors are important for better tank monitor.

Equipment for monitoring the level of liquids in ship water tanks (such as fresh water, sewage, drinking water, etc.). These sensors play a vital role in the operation and management of ships.

For example, the simplest thing is to ensure the safety of ships.

Sudden changes in tank level can be a sign of a leak or other malfunction on your vessel. Through real-time monitoring, potential problems can be discovered and dealt with in time to prevent accidents.

OK So if we want to configure Water Tank Level Sensors for our or our customers’ ships, which one should we choose? What types of Marine Water Tank Level Sensors are there?

Types of Marine Tank Level Sensors

Based on our many years of experience in liquid level measurement services at Sino-Inst, the level sensors commonly used for ship liquid level monitoring are as follows:

When the liquid level rises or falls, the float also rises or falls. Through the movement of the float on the vertical guide rod, the liquid level information can be output into an electrical signal.

  • Advantages: simple structure, low cost and high reliability.
  • Disadvantages: It may be interfered by sediments or viscous liquids, and is not suitable for use in high-temperature or high-pressure liquids.

The sensor is submerged in the liquid and measures the liquid level based on the water pressure generated by the liquid column. The higher the liquid height, the greater the water pressure.

  • Advantages: High accuracy, not affected by liquid properties (such as color, transparency), suitable for deep water storage tanks.
  • Disadvantages: Requires regular calibration and maintenance, may be affected by high temperatures and corrosive liquids.

The sensor acts as a part of a capacitor, and changes in the liquid level will cause changes in the capacitance value, thereby measuring the liquid level.

  • Advantages: Fast response and can be used with many types of liquids, including corrosive and viscous liquids.
  • Disadvantages: May be affected by sediment or other impurities and require periodic cleaning and calibration.

The sensor emits microwave or millimeter wave signals that are reflected back by the liquid surface. The liquid level height is calculated based on the time difference between the transmitted and received signals.

  • Advantages: High accuracy, not affected by liquid properties or sediments. Contactless design reduces maintenance requirements.
  • Disadvantages: Relatively high cost, installation and calibration may be complicated.

How to Choose Level Sensors for Marine Tanks?

Choosing a suitable marine liquid level meter requires comprehensive consideration based on practical applications and various factors to ensure that it can not only meet the measurement needs, but also have high cost performance and reliability.

Here are a few points to consider based on our experience:

  • Liquid properties:
    • Corrosiveness: For highly corrosive liquids, corrosion-resistant materials and sensor types need to be selected.
    • Viscosity: Some sensors may be interfered by highly viscous liquids or sediments.
    • Temperature and Pressure: The operating temperature and pressure of the liquid may place specific requirements on sensor materials and design.
  • Measuring range: The measuring range of the liquid level gauge needs to be clarified to ensure that it is suitable for the depth of the tank or the variation range of the liquid level.
  • Tank shape and installation location: The shape of the tank and installation space may limit the type of level sensor. For example, the tank may only have an external level sensor option.
  • Accuracy requirements: Determine the required measurement accuracy based on the requirements of the actual application.
  • Installation and maintenance:
    • Ease of installation: Some level gauges may require special tools or expertise to install.
    • Maintenance needs: Consider whether the sensor is easy to clean, calibrate, or replace.
  • Output and communication: Select the appropriate output interface (such as 4-20mA, RS485, Modbus, etc.) according to the ship’s monitoring system or other equipment.
  • Power requirements: Consider whether the ship’s power supply and the level gauge’s power requirements match.
  • Cost: In addition to the cost of the equipment itself, the total cost of installation, maintenance, and replacement should also be considered.
  • Environmental factors: Consider the environment the ship is in, such as whether there is a lot of salt spray, moisture, vibration, etc., and choose a liquid level gauge that can work stably under these conditions.
  • Additional functions: such as whether remote monitoring function is required, whether there is a built-in temperature or pressure sensor, whether there is an alarm function, etc.
  • Suppliers and brands: Choose suppliers or brands with good reputation and good after-sales service.


You can use a specially designed liquid level sensor to monitor the liquid level of your water tank in real time.

These sensors are usually installed at the bottom or top of the water tank and connected to a display or monitoring system so that you can visually view the water level.

Read more about:

Water Tank Level Sensors for Level Control

Water Level Monitoring Sensor/System for Sewage-Wastewater

The Secret of Water Level Control

Tank level sensors determine the height of a liquid by measuring the pressure the liquid exerts on it, changes in capacitance, or by sending and receiving reflected signals such as radar or ultrasonic waves.

When the height of the liquid changes, the signal generated by the sensor changes, and these changes are converted into electrical signals and displayed as the liquid level.

More about: 7 Type Tank Level Senors For Liquid and Solid

There are many sensors used to maintain the water tank level, including float level sensors, submersible hydraulic level sensors, capacitive level sensors and radar level sensors. Which sensor you choose depends on your specific needs and the characteristics of your tank.

A liquid level sensor for water tanks is a device used to detect and measure the water level in a water storage container or tank in real time. It can be several types of sensors that work on different principles, such as those mentioned above.

A tank level monitoring system is an integrated system for real-time monitoring and recording of liquid levels in a storage tank or water tank. The system typically includes one or more level sensors, a central processing unit, display and possibly alarm equipment. When the liquid level exceeds the preset range, the system can automatically trigger an alarm or take other measures.

How to install the Marine Water Tank Sensor?

Installing a marine water tank sensor is a relatively specialized process that requires accuracy and safety. Here’s a basic guide we’ve put together with the installation steps:

  • Choose a suitable location: Choose a location close to the center of the water tank for easy later maintenance.
  • Cleaning and pre-treatment: Remove impurities and ensure the tank level is below the predetermined level if drilling is required.
  • Drilling and fixing: Drill holes and fix the sensor according to the sensor specifications to ensure a seal.
  • Connect the wires to the output: Connect the sensor output wire to the display and make sure the connection is waterproof.
  • Debugging and calibration: Turn on the power and calibrate the sensor according to the guide.
  • Safety and Protection: Provides protection for sensors and ensures wires are securely fastened.
  • Regular inspection and maintenance: Check sensor operation and clean or calibrate as needed.

Installing marine water tank sensors requires meticulous work and specialized knowledge. If you’re not sure how to proceed, it’s best to ask a professional or follow the manufacturer’s installation guide.

More Level Measurement Solutions

We, Sino-inst, are professional tank level gauge manufacturers and suppliers. We have been supplying various types of level sensors for a long time. Including: ultrasonic level meter, radar level meter, hydrostatic level meter, capacitive level sensor, differential pressure level transmitter, etc.

The Marine Water Tank Level Sensors we supply are widely exported to various countries, including the United States, the United Kingdom, Turkey, South Africa, Nigeria, Singapore, and many other countries.

If you have any technical questions about the purchase and installation of Marine Water Tank Level Sensors, please feel free to contact our sales engineers. We will provide you with customized solutions.

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