DLO-M1 density sensor for liquids
Thanks to the measurement in the MEMS, the sensor is only 30 x 80 x 15 mm³ in size and can therefore be accommodated even in tight spaces. The high-precision measurement results are immediately available, enabling continuous measurement during the process. The density of liquids depends on their temperature. To compensate for this effect, an integrated platinum resistor measures the temperature of the liquid.
The measured values are transmitted to the higher-level system via an RS232 interface. The sensor uses an ASCII command protocol in the TrueDyne Sensors standard for this purpose.
Cooperation with Testo
From volume (l) to mass (kg)
If, for example, a fuel is pumped from a truck into a tank system, the volume of the liquid in the tank is measured as standard. However, since the density varies depending on the pressure and temperature, it is not possible to make precise statements about the mass. With the DLO-M1 sensor from TrueDyne, you can record the necessary density data during the process and use it to calculate the mass (V·ρ=m).
The density of a liquid depends on its composition. If different liquids are mixed together, the correct mixing ratio can be checked with density measurements. Take heating oil, for example: According to legal requirements, 7 % biodiesel may be added to heating oil. As biodiesel is tax-free, this process is often carried out at the limit of legality. With the DLO-M1 density sensor from TrueDyne, you can monitor the quality of the heating oil during the process.
Density and quantities derived therefrom (e.g., standard density, concentration, etc.)
Particle-free (<30 μm) hydrocarbons such as
- Gasoline E5 / E10 / E85
- Diesel B7 / B10 / XTL
- Jet-A1 (also F-35 or JP-8)
- M100 (methanol)
- OME* (synthetic fuel)
If necessary, media that deviate from the listed may be used, after individual clarification.
Density: ±0,5 kg/m³
(Option: ±[0.2 or 0.01 x abs (T-25°C)] kg/m³ if the value is >0.2³)
Temperature: ±0,3 °C
(Option ±0.15 or. ±[0.0075 x abs(T-25°C)] °C if the value is >0.15)
Density: ±0,25 kg/m³ (Option ±0,1 kg/m³)
Temperature: ±0,1 °C (Option ±0,05 °C)
Permitted medium temperature:
-20…+ 60 °C
Permitted ambient temperature:
-20…+ 60 °C
Permitted storage temperature:
-20…+ 60 °C
Range of application
Permitted density measurement range:
600…1000 kg / m³ (Option 0…1200 kg / m³)
Permitted viscosity range
0,3…5 mPa s (Option 0,3…50 mPa s)
Permitted process pressure range:
0…20 bar (abs)
Bursting pressure 80 bar (abs)
Permitted particle size:
Max. 30 μm
Permitted flow range:
0…10 l / h (water)
Due to the high operating frequency of the micro channel, vibrations (<20 kHz) do not affect the measuring accuracy.
Inlet and outlet runs:
Inlet and outlet runs do not affect the measuring accuracy.
EMV 2014/30/EU (EN 61326-1)
Vibration and shock resistance:
Degree of protection
IPx4, IPx5, IPx6, IPx7 (IEC 60529)
- 1.4404 (316L)
- 1.4542 (AISI/SUS 630)
Medium wetted material:
- 1.4542 (AISI/SUS 630)
BOROFLOAT® 33 glass
Dimensions / design
30 mm x 66 mm x 15 mm (without cable and cable bushing)
Dimensions measuring channel:
160 x 200 μm (500 nl)
2 x M5 threaded holes with an angle of 45° to the side and the front surface
Fixed installed cable
Outer diameter of cable:
Diameter of cores:
4 x AWG 28
Lead of gage:
Digital communication line and power supply in a common shielded cable
Continuous, without the need for a command from the outside
Hardware Standard RS232 Proprietary ASCII output string
Power connection DC 5 to 12 V (max. 400 mW) via power unit with safety extra low voltage (SELV) or protective extra low voltage (PELV)
The maximum permissible fault voltage between GND (signal ground) and earth must not exceed 36 Vpeek.
(Option acyclique with 100 ms response time)
white: VDD (supply voltage)
brown: GND (signal ground)
green: RX (input)
yellow: TX (output)
Note: The cable assignment corresponds to the view of the sensor (DLO-M1)
Certificates and approvals
The density sensor meets the legal requirements of the EC Directives. TrueDyne Sensors AG confirms that the density sensor has been successfully tested by applying the CE mark.
All installed components meet the requirements of the RoHS directive.
The density sensor meets the legal requirements of the EAC-Declaration. TrueDyne Sensors AG confirms that the density sensor has been successfully tested.
EMC 2014/30 / EU (EN 61326-1)
Product Design: DLO-M1 / VLO-M1
- Electronic interface for communication and power supply
- Drill holes for mechanical mounting (6 x M3 threaded holes)
- Fluidic interface (2 x M5 threaded holes)
Mechanical mounting: DLO-M1 / VLO-M1
Fluidic installation: DLO-M1 / VLO-M1