Mass Flow Sensors - d.flux multi series

Vögtlin Instruments GmbH

Flow rates up to 1400 ln/min
Up to 15 Multiple gases can be pre-programmed in the unit
Advanced Modbus communication & analog output / Optional Profinet or EtherCAT interface (Ethernet IP available soon)
Suitable up to 14 bar a and from -20 to 60 °C Body in stainless-steel 316L / Protection IP54
Laminar flow technology for linear relationship between flow rate and pressure drop
Wetted materials including 316L stainless steel, aluminium, and elastomers (FKM, EPDM, FFKM)
Five interchangeable sensor options: Core, Prime, and Prime H2 (gold-coated for hydrogen)
Multi-parameter measurement of 5 variables: mass flow, volumetric flow, normalized flow, pressure, and temperature
Integrated, direct-operated control valve for the controller variant
Standard RS-485 Modbus RTU interface with optional Profinet or EtherCAT
Integrated 50-micron stainless steel inlet filter (SS316)

The d·flux multi series is a fast and reliable multi-parameter mass flow meter and controller for gases constructed with a 316L stainless steel (1.4404) or aluminium body designed for high gas mass flow measurement using differential pressure technology over an internal laminar flow element. It is particularly suitable for applications requiring simultaneous measurement of mass flow, volumetric flow, normalized flow, pressure, and temperature with the ability to switch between up to 15 pre-programmed gases or mixtures without loss of accuracy. The device is characterized by its compact design which requires no long straight inlet or outlet sections, and it features an advanced VADy algorithm for real-time calculation of an optimum dynamic range up to 1:1000. Equipped with a variety of sensor options including the Prime H2 sensor with gold-plated membranes for hydrogen applications, the unit operates across a wide pressure range of 1 to 14 bar(a) and temperatures from -20 to +60 °C. Certified in accordance with ISO 9001 and featuring an IP54-rated housing, the d·flux multi series supports diverse communication protocols such as Modbus RTU, Profinet, and EtherCAT, and can be configured wirelessly via the Bluetooth-enabled Vögtlin Connect app

Use Cases

Precise gas supply and consumption monitoring in industrial process engineering
High-flow hydrogen applications including fuel cell testing and electrolysis systems
Analytical laboratory environments requiring multi-gas flexibility and rapid switching
Integration into compact machine modules and gas mixing skids with limited space
Biotechnology and pharmaceutical manufacturing for clean and dry gas control
Energy sector applications for monitoring natural gas or technical gas distributions

Capabilities

Wide application scope IP54
Accuracy Up to ± 0.3% user full scale and ± 0.5% of measured value
Swiss safety counter ISO 9001
High accuracy up to ±0.3% of user full scale and ±0.5% of measured value
Flow measurement and control up to 1400 ln/min for air and 2900 ln/min for hydrogen
Fast response time of 120 ms (meter) or 2000 ms (controller)
Dynamic range (turn-down) of 1:100 standard, expandable to 1:1000 with VADy feature
1 : 1000 dynamic with VADy feature available
Operating pressure range from 1 to 14 bar(a) and temperature range from -20 to +60 °C
High long-term stability with less than 0.2% measured value deviation per year
Internal real-time calculation based on the NIST REFPROP database for gas properties

Vögtlin Instruments GmbH Vögtlin specializes in precise hydrogen flow measurement instruments, serving the hydrogen economy with reliable, high-quality solutions. Founded in 1986, it has a global sales network and ISO 9001 certification.

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