To secure the fuel supply for the continuous operation of systems, tank monitoring should ideally be used. Here you can find out where tank monitoring systems are used, how they work, and what types there are.
Table of Contents
What Is Tank Monitoring?
Tank monitoring refers to the continuous recording and control of the fill level of liquids or bulk solids in tanks, silos, and other containers. The goal is to monitor the fill level, detect limit values, and thus ensure safe and efficient operation. Level sensors and switches are the core components of any tank monitoring system. They transfer the measured values into electronic signals that can be integrated into the process control.
What Is Tank Monitoring Used For?
Tank monitoring systems ensure safety, efficiency, and an uninterrupted supply. They are essential for managing inventory and process control in various industries.
Main Areas of Application for Tank Monitoring
- Industrial Processes: In the chemical industry, food and beverage production, and water and wastewater management, tank monitoring systems are used to control production processes and to store raw materials and finished products.
- Heating Oil and Fuel Storage: In both private and commercial sectors, tank monitoring systems are used to check the fill level of heating oil and diesel tanks. This prevents the fuel from unexpectedly running out and allows for proactive planning of reorders.
- Mobile Heaters and Construction Site Supply: For mobile heating centers, which are used, for example, on construction sites or at events, reliable monitoring of the fuel supply is crucial to ensure continuous operation.
- Agriculture: In agriculture, tank monitoring systems are used for the storage of water, fertilizers, and fuels.
- Safety-Critical Applications: In areas with high hazard potential, such as the storage of hydrogen or other dangerous substances, tank monitoring is a central safety element to prevent leaks or overfilling.
How Does Tank Monitoring Work?
The function of a tank monitoring system is based on the interaction of sensor technology, data processing, and transmission. The core of the system is a level sensor, which is installed in or on the tank and measures the level of the medium continuously or at intervals. The technology used varies depending on the requirements and the medium (see What types of tank monitoring systems are there?).
The sensor converts the physical measured value (e.g., distance, pressure, resistance) into an electronic signal. This signal is either passed directly to a local display or transmitted to a central control unit. Modern tank monitoring systems, especially in the area of remote monitoring, are equipped with a communication module (e.g., mobile radio, WLAN). This module sends the level data to a cloud platform or an online portal.
Via this portal, operators can view the status of their tanks anytime and from anywhere. When predefined limit values are reached, the system automatically sends notifications via email or SMS. This enables proactive planning of refills or maintenance work and minimizes the risk of bottlenecks or overflows.
Why Is Tank Monitoring Needed in Connection with Mobile Heaters?
Mobile heating centers are a flexible solution for temporary heat supply and are often used in critical situations. Continuous and trouble-free operation is crucial here. An interruption of the heat supply due to an unnoticed fuel shortage can have unpleasant consequences, such as construction stops, process interruptions, or the cooling down of buildings.
This is exactly where tank monitoring comes in. Since mobile heating centers are often operated at changing or remote locations, manual checking of the fill level is time-consuming and error-prone. Automated tank monitoring offers decisive advantages:
- Ensuring Operational Readiness: Continuous monitoring of the fuel supply prevents the tank from unexpectedly running empty and thus ensures an uninterrupted heat supply.
- Efficient Logistics: Remote monitoring of the fill level allows refills to be planned proactively and according to demand. This optimizes route planning for fuel suppliers and reduces logistics costs.
- Reduced Personnel Effort: Regular on-site checks by personnel become unnecessary. The system automatically reports critical fill levels, which saves time and resources.
- Increased Safety and Control: Modern monitoring systems offer a complete overview of the system status, including fill level, temperatures, and any malfunctions. This enables a quick response to problems and minimizes operational risks.
Tank monitoring for mobile heaters is therefore an indispensable tool for maximizing operational safety, increasing efficiency, and guaranteeing smooth operation.
What Types of Tank Monitoring Systems Are There?
A distinction is made between continuous measurement methods, which record the fill level permanently, and limit level detectors, which only signal when a certain fill level has been reached.
The following table provides an overview of the most common measurement principles:
| MEASUREMENT PRINCIPLE | FUNCTIONALITY | ADVANTAGES | DISADVANTAGES | SUITABLE FOR |
|---|---|---|---|---|
| MECHANICAL (FLOAT) | A float on the liquid surface is mechanically connected to a display | Simple, cost-effective, no power supply required | Low accuracy, susceptible to wear, not suitable for remote monitoring | Simple applications, heating oil tanks in single-family homes |
| PNEUMATIC | Air is pumped into a measuring line in the tank. The resulting back pressure is proportional to the fill level | Robust, suitable for many liquids | Requires compressed air supply, accuracy can be affected by density fluctuations | Heating oil and diesel tanks |
| ULTRASOUND | A sensor sends ultrasonic waves to the medium surface. The distance and thus the fill level are calculated from the transit time of the echo | Non-contact, insensitive to medium properties, low maintenance, suitable for solids and liquids | Can be disturbed by foam, strong vapors, or turbulence | Water, wastewater, chemicals, bulk solids |
| RADAR | Similar to ultrasound, but with radar pulses; the transit time of the reflected waves is proportional to the fill level | Very high accuracy, non-contact, insensitive to pressure, temperature, vapor, and foam | More expensive than other technologies | Aggressive media, high temperatures, demanding process conditions |
| GUIDED RADAR (TDR) | Radar pulses are guided along a rod or cable; this bundles the signal and increases reliability | Very reliable even with foam, turbulence, and low dielectric constants of the medium | Contact with the medium, internal tank structures can interfere with the measurement | Liquids, bulk solids, interface measurement |
| VIBRATING FORK | A fork is set into vibration; if it comes into contact with the medium, the vibration frequency changes, which triggers a switching operation | Reliable, robust, insensitive to foam and viscosity | Only limit level detection, no continuous measurement | Overfill protection, dry-run protection for pumps |
| MANUAL (DIPSTICK) | A rod or measuring stick is inserted into the tank to manually measure the fill height | Extremely cost-effective, simple | Inaccurate, time-consuming, requires direct access to the tank, risk of contamination | Simple checks when high accuracy is not required. |
The selection of the right system depends on various factors, such as the medium to be measured, the process conditions (pressure, temperature), the accuracy requirements, and the budget.
References:
WIKA. (seen on 10/08/2025). Tanküberwachung.
Heizung.de. (seen on 10/08/2025). Öltankanzeige: die Füllstandsanzeige für Öltanks.
ACR Chiller Rent. (seen on 10/08/2025). Mobile Heizung mieten.
SHK Profi (seen on 10/08/2025). Online-Überwachung mobiler Heizzentralen.
Bürkert (seen on 10/08/2025). Methoden der Füllstandsmessung.