Wireless Fuel Level Sensor – DUT-E S7
The DUT-E S7 is a smart, wireless fuel level sensor. Designed for reliable and accurate monitoring of fuel volume in vehicle tanks, machinery, and stationary fuel storage. Powered by Bluetooth Low Energy (BLE). It transmits data without the need for physical wiring. Therefore, making it ideal for fast installations and retrofits across fleet and industrial applications.
With no external power source required. The DUT-E S7 operates independently using a built-in battery, providing up to 10 years of maintenance-free operation. It is compatible with modern telematics systems, mobile devices, and our supplier’s Fuel Tank Monitor app — delivering real-time insights into fuel levels, refuelling, and potential fuel theft events.
Key Features
📡 Wireless Communication
Transmits data over Bluetooth 5.x (BLE) to telematics units, smartphones, tablets, and BLE-compatible gateways.🔋 Self-Powered Operation
Built-in battery offers 5–10 years of life depending on transmission intervals and environmental conditions.🛠️ Easy, Cable-Free Installation
No wiring required — reducing installation time, improving security, and minimising the risk of vandalism or tampering.📏 Flexible Probe Lengths
Available in standard lengths (700 mm, 1,000 mm) and extendable up to 3,000 mm to suit a wide range of fuel tank sizes.🧠 Smart Data Reporting
Sends fuel volume, temperature, and refuelling/draining events at customisable intervals (default: every 5 seconds).💥 Explosion-Proof Certified
Safe for use in fuel tankers, depots, and hazardous environments — certified to international Ex standards.📱 Mobile App Integration
Compatible with our Supplier’s Fuel Tank Monitor App for real-time viewing, configuration, and notifications.🔧 Cut-to-Length Installation
Probe can be trimmed on-site to match the exact tank depth for accurate measurement.
Why Choose Our Wireless Fuel Monitoring Solution?
- Real-Time Updates: Provides instant insights into fuel levels.
- Seamless Integration: Bluetooth connectivity ensures compatibility with a range of modern devices.
- Flexible Applications: Suitable for both mobile and stationary fuel storage.
- Durable Build: Engineered to withstand challenging environmental conditions.
- Low Maintenance: Wireless setup minimises wear and tear, ensuring reliable long-term usage.
Fuel Tank Smartphone App
The Fuel Tank Smartphone App for the DUT-E S7 is available from Google Play or the Apple App Store. Firstly, the driver can check volume refills, how much is left in the tank and alarms if any is stolen. Plus, it allows fleet managers to record fuel volume in the tank when transferring the vehicle from a driver to another.
Fuel Tank App Features include
- Information about the sensors including serial number, firmware version and address within S7 network
- Saving profile from other android devices
- Sensor Calibrations on whether tank is full or empty
- Fuel Tank Calibration Table
- Self-Diagnostics information
- Data logging from DUT-E S7 Fuel Level Sensor
Specifications on the DUT-E S7 Fuel Level Sensor
| Operating Principle | Capacitive |
| Wireless Transfer Interface | Bluetooth 5.X |
| Tx Power | +4 dBm |
| Rx Sensitivity | -88 dBm |
| Maximum distance between sensor and receiving device | 10 to 20 Metres when in a vehicle or building 50 Metres when in line of sight |
| Number of BLE compatible devices receiving signals simultaneously | Any Number in DUT-E S7 Transmitter's Operation Range |
| Data Transfer Interval | 5 Seconds |
| Estimated life time of sensor (battery) | 5 to 10 years depending on ambient temperature |
| Temperature Range | -30° to +80 ° C |
| Standard Probe Length mm | 700, 1000 (Up to 3000mm can be manufactured on request) |
Applications
🚛 Fleet & Transport
Fuel level monitoring in long-haul trucks, delivery vehicles, and buses
Ideal for fleets requiring quick, cable-free sensor installations
Prevents fuel theft and supports route-based consumption analysis
🏗️ Construction & Heavy Equipment
Tracks fuel usage in generators, excavators, and mobile equipment
Enables rapid sensor deployment without complex cabling
🚜 Agricultural Machinery
Manages diesel and biodiesel use in tractors, harvesters, and irrigation pumps
Helps monitor consumption during seasonal operations
🛢️ Stationary Fuel Storage
Wireless monitoring for remote fuel tanks in off-grid locations
Ideal for refuelling stations, depots, and industrial fuel tanks
🛳️ Fuel Tankers & Marine
Provides safe, wireless fuel tracking for onboard tanks
Explosion-proof design ensures safety compliance
Installation & Integration
The DUT-E S7 mounts via a standard 5-bolt flange, allowing for direct replacement of existing sensors or new installation points. The sensor’s probe can be cut to match tank depth or extended up to 3,000 mm with optional extension sections.
Configuration and calibration can be done easily via Bluetooth using a smartphone or tablet, reducing setup time and improving convenience — no additional service tools or wired connections required.
Compatible Accessories
Mounting Kit (MK DUT-E) – For secure sensor installation and sealing
Probe Extension Sections – Extend probe length up to 3,000 mm
Fuel Tank Monitor Mobile App – For sensor data viewing and configuration
BLE Gateways – For cloud-based fleet integration (optional)
Enhance your fuel tracking and management with our Wireless Fuel Monitoring Device. Contact us today for more information or to request a quote!
Other Level Sensors for Fuel Monitoring
FAQs
Q: How does the wireless fuel monitoring device operate?
A: The device uses Bluetooth technology to transmit real-time fuel level data to connected devices such as smartphones or PCs. It can also integrate with GPS trackers for comprehensive tracking.
Q: Is the device suitable for all tank types?
A: Yes, it works with various tank materials, including metal and plastic, and can be used in both above-ground and underground setups.
Q: What are the power options for the device?
A: It can be powered either by an internal battery or an external power source, depending on installation needs.
Q: Can this device help prevent unauthorised fuel use?
A: Absolutely. It provides real-time alerts for unusual fuel level changes, aiding in fuel theft detection and prevention.
🔧 BLE Module Activation and Operating Modes – DUT-E S7
The DUT-E S7 sensor operates in three different modes, depending on the state of its built-in Bluetooth Low Energy (BLE) module:
1. Safekeeping Mode (Factory Default)
This is the default mode after manufacturing.
The BLE module is deactivated, and the sensor does not transmit any data.
Used for storage and shipping.
2. Technological Mode (Temporary Setup Mode)
Allows limited access to check the sensor’s serial number and firmware version via the S7 app.
To activate:
Touch a permanent magnet to the sensor head cap.
The sensor will remain in this mode for 4 hours or until the magnet is applied again.
After that, it automatically returns to Safekeeping Mode.
3. Working Mode (Full Operation Mode)
This is the main mode for sensor installation and operation.
BLE becomes fully active and stays on for the entire lifetime of the sensor.
In this mode, you can configure the sensor and monitor fuel data via the DUT-E S7 Service App.
To activate Working Mode:
Use a small screwdriver to touch both metal tubes on the measuring probe (creating a short circuit).
At the same time, touch a permanent magnet to the sensor head cap.
Once in Working Mode, the sensor cannot revert to any other mode.
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