DFM S7 and DFM DS7 wireless fuel flow meters are designed for direct measurement of liquid fuel and mineral oil consumption with a kinematic viscosity of 1.5 to 6.0 mm2/s, as well as for monitoring fuel consumer operating time. DFM S7/DS7 flow meters can be used independently or as part of vehicle telematics and remote monitoring systems for vehicles, stationary engines, diesel generator sets, boilers and other fuel-consuming equipment.
The flow meters use S7 Technology for wireless data transfer via Bluetooth Low Energy (Bluetooth 4.1). The BLE module transmits current readings every 5 seconds in advertising mode, allowing the data to be received simultaneously by compatible telematics units and GPS trackers, Bluetooth displays, smartphones and tablets within the signal range.
DFM S7 Wireless Fuel Flow Meter Core Features
- BLE-radio mode – data is transmitted simultaneously to multiple receiving devices
- built-in battery – the flow meter operates without an external power supply
- ultra-low power consumption enables autonomous operation for up to 5 years
- explosion and fire safety without additional intrinsic safety barriers
- no signal cable – enhanced resistance to vandalism and accidental cable damage
DFM S7 Wireless Fuel Flow Meter Tasks
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Preventing fuel theft |
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Fuel consumption monitoring |
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Engine testing for fuel consumption |
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Machine running time tracking |
Models of wireless fuel flow meters
Fuel consumption and operating time Counters
- Hourly fuel consumption, L/h
- Total fuel consumption, L
- Total fuel consumption in “Idle” mode
- Total fuel consumption in “Optimal” mode
- Total fuel consumption in “Overload” mode
- Fuel consumption in “Tampering” mode, L
- Engine operation mode by fuel rate
- Fuel temperature
- Battery charge level
- Total operating time, h
- Total operating time in “Idle” mode, h
- Total operating time in “Optimal” mode, h
- Total operating time in “Overload” mode, h
- Operating time in “Tampering” mode, h
- Operating time in “Interference” mode, h
Bluetooth data transfer to a telematics unit or GPS tracker
he flow meter continuously transmits fuel consumption readings, data from Counters, information on Events, engine operation modes, Parameters and flow meter malfunctions in the “advertising” (BLE-radio) mode. Using S7 Technology, the data can be received by all compatible devices within the operating range of the flow meter BLE module.
Fuel consumption control via Bluetooth on a smartphone
To receive data from DFM S7 wireless fuel flow meters on a smartphone or tablet running Android 5.0 or higher, use the Fuel Rate Monitor mobile application. Its functionality allows the user to :
- monitor fuel consumption and fuel temperature in real time
- account for total fuel consumption and fuel consumption by operating mode
- account for fuel consumer operating time
- display the current operating mode based on fuel consumption
- view a real-time graph of hourly (instant) fuel consumption
- monitor active flow meter malfunctions
- check the charge level of the built-in battery
- log hourly fuel consumption and fuel temperature readings
- perform operations with the flow meter profile
Fuel consumption control via Bluetooth on a smartphone
Fuel flow meter for ships using NMEA 2000
MasterCAN S7 NMEA data converter continuously receives data from DFM S7 fuel flow meters using S7 Technology within a range of up to 50 m. The converter processes the received data and converts it into NMEA 2000 PGNs. Fuel consumption, fuel temperature and fuel consumer operating time can then be transmitted over the vessel’s NMEA 2000 network to compatible onboard devices.
DFM S7 part number description for ordering
The designation U is relevant only for single-chamber models.
Models are delivered by special order.
Technical specifications of wireless flow meters
| Max pressure, bar | 25 |
| Wireless data transfer interface | Bluetooth 4.1 |
| Transmitter power (Tx Power), dBm | +4 |
| Maximum distance between the flow meter and the receiving device, m | 15 (with metal/concrete partitions at the installation site) 45 (within line-of-sight range) |
| Autonomous operating time from the built-in battery, years | up to 5* |
| Operating temperature range, °C | −40…+85 |
| Ingress protection rating (IP Code) | IP54 |
* At a constant ambient temperature of +20 °C. Under actual operating conditions with temperature fluctuations, autonomous operating time may be reduced, but is guaranteed to be at least 2 years.
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