Laminar Flow Elements
Laminar flow elements (LFE) measure the flow of air or gas quickly and accurately. Available in a wide range and many gradations, they are the right choice for a wide variety of applications in flow measurement and calibration with air or gases.
The differential pressure occurring at the laminar flow element is 10 or 20 mbar at nominal final flow value, depending on the series. For sensitive tasks with regard to pressure loss, the LFEs can also be used with a maximum differential pressure of up to 1 mbar with a corresponding linear reduction in the final flow rate.
Main Features
- Stable measurement of very small quantities
- Gas applications possible with glass capillary (O2, H2, CO2…)
- TTI differential pressure sensor can be directly flange-mounted
- Inlet/outlet sections without diameter jump
LFE S-Series
The S-series laminar flow elements from our own production cover a wide scale of measuring ranges. With measuring capacities ranging from 0.5 cm³/min to 1.0 m³/min (air), LFEs are available in six different nominal widths.
The S-series in square design is the most compact type of laminar flow element in our portfolio. In addition to the small design, the LFE can be equipped with either a precise and customised glass capillary or a multi-channel stainless steel matrix. Depending on the area of application, both options are advantageous.
| Properties | Functions |
|---|---|
| Flow range | 0.5 mL/min up to 1,100 L/min (@ 20 mbar differencial pressure) |
| Accuracy (max. linearity mismatch) |
Glas capillaries: 0.3 % Stainless steel matrix: 0.5 % |
| Material | Stainless steel / Aluminium |
| Matrix | Glas capillaries / Stainless steel matrix |
| Seals | PTFE oder FPM |
| Turndown range | 1:10, special case 1:30 |
| Pressure connection | M5 f |
| Process connection | 1/4"f up to 2"f NPT |
| Operating temperature | 0 up to 70 °C |
| Operating pressure | 0.4 up to 11 bar absolute |
| Gas type | Air, inert gases, process gases, oxigen,hydrogen, CO, CO2 … other gases on request |
LFE R-Series
The R-series extends the flow range up to 63 m³ /min. with a round design. The inlet/outlet paths of the LFEs are simultaneously used as a reduction to the desired tube diameter.
The R-series is capable of ensuring clean and highly reproducible results, even in high-pressure applications. It is also possible to use the largest structural form in foreign gas applications.
| Properties | Functions |
|---|---|
| Flow range | 2,800 L/min up to 63,700 L/min (@ 20 mbar differencial pressure) |
| Accuracy (max. linearity mismatch) |
Stainless steel matrix: 0.5 % |
| Material | Stainless steel / Aluminium |
| Matrix | Stainless steel matrix |
| Seals | PTFE oder FPM |
| Turndown range | 1:10, special case 1:30 |
| Pressure connection | G 1/8" f |
| Process connection | Reduction with flange |
| Operating temperature | 0 up to 70 °C |
| Operating pressure | 0.4 up to 11 bar absolute |
| Gas type | Air, inert gases, process gases, oxigen,hydrogen, CO, CO2 … other gases on request |
Main Features
- Very fast results of a measurement
- Gas applications possible (H2, CO2 …)
- TTI differential pressure sensor directly flanged, even with zero function
- Flange/Pipe ends/Valve connections
- Inlet/outlet sections also as a reduction
- Easily possible replacement from inline operation
Main Features
- Stable and fast measurements at atmospheric intake
- TTI differential pressure sensor can be directly flange-mounted
- Inlet/outlet sections also as a reduction
- Maintenance through removable filters
LFE F-Series
The F-series plays in the same flow area as the R-series, but it has expanded the structure with suitable inlet and outlet filters, which make a pollution-free operation possible over the years.
The LFE of the F-series can also be operated inline if required. For this purpose, large tons are pushed over the filter heads and screwed together with the LFE base. This makes it easy to use in a variety of situations.
| Properties | Functions |
|---|---|
| Flow range | 2,800 L/min up to 63,700 L/min (@ 20 mbar differencial pressure) |
| Accuracy (max. linearity mismatch |
Stainless steel matrix: 0.5 % |
| Material | Stainless steel / Aluminium |
| Matrix | Stainless steel matrix |
| Seals | PTFE oder FPM |
| Turndown range | 1:10, special case 1:30 |
| Pressure connection | G 1/8" f |
| Process connection | Reduction with flange |
| Operating temperature | 0 up to 70 °C |
| Operating pressure | 0.4 up to 11 bar absolute |
| Gas type | Air, inert gases, process gases, oxigen,hydrogen, CO, CO2 … other gases on request |
LFE T-Series
The T-Series is another addition to the R- and F-Series, but it is specifically designed for inline operation of filter-protected LFEs with a high measurement range.
If inline measurements with dust- and dirt-laden air or bidirectional operation of a flow measurement with large volume flows are required, then an LFE from the T-Series is the solution. Based on the flow sizes of the R-Series, this series has dual particle filters and precisely designed filter barrels with flange or pipe connections for low-maintenance and leak-free inline volume flow measurements.
| Properties | Functions |
|---|---|
| Flow range | 2,800 L/min up to 63,700 L/min (@ 20 mbar differencial pressure) |
| Accuracy (max. linearity mismatch) |
Stainless steel matrix: 0.5 % |
| Material | Stainless steel / Aluminium |
| Matrix | Stainless steel matrix |
| Seals | PTFE oder FPM |
| Turndown range | 1:10, special case 1:30 |
| Pressure connection | G 1/8" f |
| Process connection | filter barrel with flange/pipe end |
| Operating temperature | 0 up to 70 °C |
| Operating pressure | 0.4 up to 11 bar absolute |
| Gas type | Air, inert gases, i.e. CO2, N2 … other gases on request |
Main Features
- Very fast results of a measurement
- Gas applications possible, with some restrictions (CO2, inert gases …)
- TTI differential pressure sensor directly flanged, even with zero function
- Flange/Pipe ends on filter barrels
- Inlet/outlet sections in form of particle filters
- Easy exchange from inline operations
- Very easy filter replacements
Accessories
We also offer further measurement technology accessories for flow measurement. In addition to suitable sensors for the LFE measuring section, complete evaluation units for plug-and-play measurements are also available.