Truedyne DGF-I1 Density Sensor for Gases



  • High-Precision Measurement
  • Compact Design
  • Check the quality of the gas mixture in real time

Truedyne DGF-I1 Density Sensor for Gases

Measure the density of a gas directly in the gas line or in the gas tank: This is made possible by the DGF-I1 density sensor from TrueDyne.

​At the heart of the sensor is a microelectromechanical system (MEMS) with an oscillator in the form of a tuning fork. For the measurement, the metal housing surrounding the MEMS is filled with the medium. The natural frequency of the oscillator varies depending on the density of the gas surrounding it. In order to compensate for temperature effects, a platinum resistor which precisely measures the local temperature is built into the sensor.

The sensor is very compact with a diameter of 31 mm and a length of 63 mm and can be placed in even the smallest of spaces. It is screwed directly into the gas line or the gas tank with the integrated connection, and a filter protects against contamination. The measured values are transmitted to the higher-level system via an RS485 interface. The response time of 5 seconds enables density measurement directly in the process – the measurement does not have to be interrupted.

Features of the TrueDyne DGF-I1 Density Sensor for Gases include:

  • Microelectromechanical system (MEMS)
  • Measures density, but also temperature and pressure
  • Operating temperatures: -20°C to +60°C
  • Measuring range: 0-10 bar (absolute)
  • Monitoring of welding gas mixtures
  • M8 connection, 4-pin, according to IEC 61076-2-104


Manufacturer: TrueDyne

Part Ref: DGF-I1


Gas: Other Gas

Media Type: Gases

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Specification Detail of the TrueDyne DGF-I1 Density Sensor:

Pipe Size

Material Body
Stainless Steel

Pressure Range
0-10 bar (absolute)

Power Supply
DC 4.5…12 V (max. 200 mW)

M8 connection, 4-pin, according to IEC 61076-2-104

Operating Temp Range
-20°C to +60°C


Density sensor weight
<150 g

• On the hardware standard RS485.
• Modbus RTU communication protocol (inspired by Modbus RTU), see “Modbus RTU register

Permitted Media
Only use permissible gases or their mixtures with a low moisture concentration (<0.1%).

• Hydrogen (H2)
• Helium (He)
• Nitrogen (N2)
• Oxygen (O2)
• Carbon dioxide (CO2)
• Argon (Ar)

Media that deviate from the fluids listed above can be used after individual clarification where applicable. These include neon (Ne) and krypton (Kr), for example.