FLEXI-FLOW™ Compact Thermal Mass Flow Meters
Smart Thermal Mass Flow Meters for Gas — Now Available
Measuring gas flow shouldn't be complicated. That's why we've developed the FLEXI-FLOW™ Compact series. A range of smart thermal mass flow meters designed to make your work easier, faster, and more accurate.
Six models are now available in our web shop with shipment within 2 business days when in stock. Whether you're running experiments in a university lab, developing fuel cells, or managing biotech processes, these meters deliver the flexibility and precision you need.
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Why Choose FLEXI-FLOW Compact Mass Flow Meters?
Traditional mass flow meters often require separate instruments for different gases or flow ranges. The FLEXI-FLOW Compact changes that. Here's what makes this smart flow meter series stand out:
Multi-Gas Flexibility Without Recalibration
Select your process gas. With 22 on-board gases, it is very easy to switch to another gas or mixture. Additionally, the on-board gas database is used for real-time corrections on the flow measurement based on the actual process conditions (temperature).
Switch between gases instantly with mobile or desktop app without sending your instrument back for recalibration.
Common gasses are pre-installed like Air, Nitrogen, Oxygen, Hydrogen, Argon, Helium, Methane, Carbon Dioxide
High Accuracy Across Wide Dynamic Ranges
Whether you need to measure 5 mln/min or 500 ln/min, FLEXI-FLOW maintains exceptional accuracy. The innovative through-chip sensor combined with bypass technology ensures stable, repeatable measurements even when temperature or process conditions fluctuate.
With a turndown ratio of 1:50 and accuracy of ±1.5% Rd plus ±0.5% FS (At calibration conditions) this a versatile instrument for your application.
Ultra-Fast Response Times 
Due to the ultra-thin sensor tube, the sensor reacts instantaneously to changes of the gas flow, resulting in very fast flow measurement.
Free Configuration Software and self diagnosis
Effortlessly set up and monitor your instrument using our free mobile app or desktop software FlowSuite. Access real-time data and adjust key parameters (Actual and totalized flow etc.)
The instrument shows the status of self-monitoring and diagnosis by means of a coloured LED. This signal can be easily recognized by the operator.
Built for Labs, R&D, and Industry
Whether you’re working in reactive sputtering, analytical systems, general lab application or looking for Mass Flow Meters for fuel cell development, FLEXI-FLOW delivers.
Applications for the FLEXI-FLOW Compact Mass Flow Meter:
- Biotechnology: Multi-gas functionality and multiple flow ranges in one device, with many communication options.
- Gas Mixing: High accuracy and repeatability, fast chip sensor technology and ease of use.
- Leak Testing: Reliable flow measurement across a large dynamic range.
- Analytics: Ideal for analytical benchtop devices due to its compact size, with a wide selection of gases on board.
- Research: Measure multiple parameters without having to change the instrument.
Ready to Upgrade Your Gas Flow Measurement?
👉 Order today and experience the FLEXI-FLOW difference.
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| Max. capacities per model for various gases | Flow Unit | Air | N2 | O2 | H2 | Ar | He | CH4 | CO2 |
|---|---|---|---|---|---|---|---|---|---|
| mln/min | 5 | 5 | 4.5 | 5 | 4 | 7 | 4 | 3.5 | |
| FF-103 | mln/min | 50 | 50 | 45 | 50 | 40 | 70 | 40 | 35 |
| FF-105 | mln/min | 500 | 500 | 450 | 500 | 400 | 700 | 400 | 350 |
| FF-107 | ln/min | 5 | 5 | 4.5 | 5 | 4 | 7 | 4 | 3.5 |
| FF-109 | ln/min | 50 | 50 | 45 | 50 | 40 | 70 | 40 | 35 |
| FF-111 | ln/min | 500 | 500 | 450 | 500 | 400 | 700 | 400 | 350 |
Do you need the FLEXI-FLOW in a Controller?
Please contact your local distributor for advice and a quote.
More possibilities are available for the FLEXI-FLOW like:
- More parameters: Flow, temperature, upstream pressure, downstream pressure
- More fieldbuses: Profinet (EtherNet based)
- Better accuracy of 0,8%Rd plus ±0,2%FS (Rangeability up to 1:500) or 0,5%Rd plus ±0,1%FS (Rangeability up to 1:1000)
- Controller with Shut-off function or downported controller of meter
- Body material of parts SS316L incl. Ra<0.8um measureable wetted parts
- External display on the instrument
See for more information on the product page or FAQ of the FLEXI-FLOW at Bronkhorst: All-in-one gas flow meter and controller in compact form
Frequently Asked Questions about FLEXI-FLOW Compact
Which thermal mass flow meter models are available for nitrogen and air measurements?
The FLEXI-FLOW Compact series includes six models, ranging from the FF-101 (5 mln/min) up to the FF-111 (500 ln/min). All models measure air, nitrogen (N2), oxygen (O2), hydrogen (H2), argon (Ar), helium (He), methane (CH4) and carbon dioxide (CO2) with one instrument — no separate meter needed per gas.
I'm designing an automated system and need reliable, compact gas flow measurement — what are my options?
FLEXI-FLOW Compact thermal mass flow meters are built for exactly this. They combine a compact footprint with 22 on-board gases, Bluetooth and USB connectivity, and a turndown ratio of 1:50, so you can switch gases or flow ranges without swapping hardware or sending the instrument back for recalibration.
What is the accuracy of the FLEXI-FLOW Compact mass flow meter?
Under calibration conditions, accuracy is ±1.5% Rd plus ±0.5% FS, with a turndown ratio of 1:50. Higher-accuracy variants (down to ±0.5% Rd plus ±0.1% FS, rangeability up to 1:1000) are available on request via your local distributor.
Can the FLEXI-FLOW measure multiple gases without recalibration?
Yes. With 22 gases stored on board, you can switch between gases or gas mixtures instantly using the free FlowSuite mobile or desktop app — no need to return the instrument for recalibration.
Is the FLEXI-FLOW Compact suitable for biotech and fuel cell applications?
Yes. The compact size, multi-gas flexibility and fast response time make it well suited for biotechnology processes, bioreactors, fuel cell development, gas mixing, leak testing and analytical benchtop instruments.
How fast does the FLEXI-FLOW Compact respond to changes in gas flow?
The ultra-thin sensor tube reacts almost instantaneously to changes in gas flow, giving a very fast response time compared to conventional thermal mass flow meters.