DUT-E S7 wireless sensor allows measuring current fuel volume and its changes in a fuel tank. DUT-E S7 is used as a part of vehicle telematics system (GPS vehicle tracking system) and provides reliable information on remaining fuel volume, fuel tank fill-up and draining volumes and helps fleets to set up clear fuel accounting and prevent fuel theft from vehicle’s tank. DUT-E S7 wireless fuel level sensor is also used for fuel level monitoring in stationary tanks.
Wireless data transfer is carried out using S7 Technology via BLE channel. BLE signal from DUT-E S7 can be received by compatible vehicle tracking unit (telematics unit) and/or any Android device.
DUT-E S7 can also be used as a “night watchman” to alert a driver to fuel theft from vehicle’s tank, for example, when resting at night parking.
Wireless Fuel Level Sensor Tasks
Monitoring of fuel tank fuelling and draining
Fuel theft detection
Fuel usage monitoringAdvantages of DUT-E S7 Wireless Fuel Level Sensor
- wireless data transfer using S7 Technology via BLE (Bluetooth 5.X Low Energy);
- operation in BLE-radio mode without pairing with receiver – simultaneous data transfer to telematics unit, smartphones, tablets with Bluetooth
- built-in battery – DUT-E S7 works without external power supply;
- very low power consumption allows autonomous operation of sensor up to 5 years;
- explosion protection confirmed by the IECEx Certificate of Conformity. The equipment is certified to IEC 60079-0 and IEC 60079-11 under IECEx Certificate IECEx FTZU 25.0021X
- DUT-E S7 is compatible with telematics unit from leading manufacturers — Navtelecom, Teltonika, Falcom, Neomatica and others — as well as with the CANUp telematics gateway.
DUT-E S7 has all the advantages of “classical” DUT-E fuel level sensor models :
- shortening/extending length of measuring probe;
- bottom spring for higher rigidity of mounting into tank;
- screen filter for probe protection from water and mud in a tank;
- digital self-diagnostics feature for sensor operation quality check;
- automatic compensation of ambient temperature effect on sensor’s parts.
- holes for sealing sensor in order to avoid unauthorized dismounting;
- bayonet mounting plate allows to reduce mounting time;
- ergonomic grooves for comfortable grip when fastening in bayonet mounting;
- full set of mounting accessories;
- conformity with European and national automotive standards.
Fuel Tank Monitor smartphone app
Driver
Checking fuel volume refill at gas station; Quick check of current fuel volume in tank; Getting alarms on fuel theft from tank.
Fleet manager
Checking and recording fuel volume in vehicle tank when transferring vehicle from one driver to another
Fuel Tank Monitor app features :
- displaying information about the sensors (serial number, firmware version, address within S7 network);
- saving and uploading sensor profile to / from other android devices;
- keeping fuel level sensor’s “Empty” / “Full” calibration parameters;
- keeping fuel tank calibration table;
- display notifications on fuel tank fill-up / discharging;
- fuel level sensor self-diagnostics information;
- data logging from DUT-E S7 fuel level sensor
- function of automatic defining the remaining distance of the route;
- function of summation of the fuel volume indications of the specified group of sensors;
- data display in metric/USC systems of units of measurement;
- function of automatic defining the time left before the tank is full during fuelling;
- separate configuration of functions of the Events detection: “Fuelling”, “Discharging” and others.
Why customers choose DUT-E S7
- Wireless BLE : less installation work, lower risk of tampering.
- Compatibility : Android devices and telematics terminals.
- Autonomy : long service life with no maintenance.
- Protection : resistant to sabotage attempts.
- Accuracy : stable measurements in complex-shaped tanks.
Wireless Fuel Level Sensor Specification
| Estimated lifetime of the sensor (battery life), years | 5* |
| Fuel level sensor operating principle | Capacitive |
| Wireless data transfer interface | Bluetooth 5.X |
| Tx Power, dBm | +8 |
| Rx sensitivity, dBm | -97 |
| Maximum distance between sensor and receiver, m | Maximum distance between sensor and receiver: up to 20 m when mounted on a vehicle or inside buildings; up to 50 m within line of sight. |
| Maximum measuring probe extension, mm | up to 6,000 mm; up to 10,000 mm only for sensors with an Ø8 mm inner tube manufactured after 01.02.2026. |
| Data transfer interval, s | 5 |
| Number of simultaneous BLE-signal receivers | Any number in DUT-E S7 operation range |
| Temperature range, °C | -30…+80 |
Under fluctuating temperature conditions, the service life may be reduced, but is guaranteed for at least 2 years.
BLE module activation
DUT-E S7 operates in four modes, which are defined by BLE-module state :
- “Storage” — in this mode DUT-E S7 is kept from the date of production. BLE-module of the sensor is deactivated, no signal is sent.
- “Manufacturing” — limited functionality mode, enabled only for serial number and firmware version check through Fuel Tanks Monitor app.
To activate this mode, touch sensor head’s cap with permanent magnet. After 4 hours or after re-touch of cap with the magnet, BLE-module of the sensor will switch back into “Storage” mode. - “Operating” — full functionality operation mode of DUT-E S7. “Operating” mode is enabled when installing the sensor into a fuel tank. After enabling this operation mode, it becomes possible to adjust configurations related to a particular sensor and monitor its values using Fuel Tanks Monitor mobile application.
- “Service” — this mode serves to update the inbuilt firmware of sensors and to record the Sensor profile (saved before in the mobile device memory) into the internal memory of DUT-E S7 or DUT-E 2Bio S7.
In “Operating” mode, BLE-module of DUT-E S7 becomes active for the remaining lifetime of the sensor without possibility of switching to any other mode.
To enable “Operating” mode, small screwdriver and permanent magnet should be used. A screwdriver should touch both tubes (i.e. make a short circuit of measuring probe) and permanent magnet should touch sensor head’s cap.
Detailed description of the modes is provided in the Fuel Tanks Monitor mobile application user manual.
What is the purpose of the DUT-E fuel level sensor?
The DUT-E fuel level sensor measures the fuel level and volume in the tank. Based on DUT-E readings, it is possible to determine the refueling volumes, the current fuel remaining, and the volumes of fuel drained from the tank.
What types of machinery is the DUT-E fuel level sensor designed for?
The DUT-E fuel level sensor is used on commercial vehicles and heavy machinery equipped with one or more fuel tanks. Tank shape is not a limiting factor — since DUT-E has no moving parts, it can be installed in tanks with rectangular, cylindrical, or irregular geometries.
How to use data from the DUT-E fuel level sensor?
Typically, the DUT-E fuel level sensor is connected to a vehicle monitoring terminal or a telematics gateway, which transmits the data to cloud-based GPS tracking software. The cloud software generates reports on fuel refueling volumes, refueling locations, and fuel drain volumes (e.g., theft from the tank). This information enables prompt response to improper vehicle operation, as well as detailed analysis of fuel costs and operational efficiency for individual units and the entire fleet.
Is it mandatory to connect the DUT-E fuel level sensor to a monitoring terminal?
Not necessarily. The wireless DUT-E S7 fuel level sensor transmits data via Bluetooth to a smartphone application, while the DUT-E GSM — a 2-in-1 solution — can send information directly to cloud-based software via the Internet, as well as to the user’s smartphone via SMS and email.
What is the operating principle of the DUT-E?
DUT-E is a capacitive-type fuel level sensor consisting of an outer and an inner tube, with a dielectric liquid (e.g., diesel fuel) filling the space between them. This design, with no moving parts, allows DUT-E to be used in tanks of various shapes and enables easy adjustment of the measuring section’s length.
Can DUT-E measure CO₂ emissions during engine operation?
No, DUT-E measures only the fuel level and volume in the tank. It cannot directly measure fuel consumption or determine CO₂ emissions — these tasks are handled by DFM fuel flow meters.
What is the key distinguishing feature of Technoton’s DUT-E fuel level sensors?
The Technoton product line includes four types of DUT-E fuel level sensors, each with different functionality, but all offering the following advantages :
- Transmission of up to 25 parameters — providing highly detailed fuel tank monitoring.
- Easy installation on tanks of various heights — sensor length can be freely cut or extended on-site.
- High measurement accuracy — step of measurements 0.1 mm of fuel level, ±1% error margin, and temperature correction.
- Capability to build a multi-tank monitoring system — up to 32 DUT-E units in a single network using S6 Technology.
- Durable design — no moving parts, over 20 years on the market, quality control certified to ISO 9001.
Read more : DUT-E GSM Fuel Level Sensor with GSM and GPS
