These mass flow sensors are based on the Coriolis principle which allows measuring the flow independently from the type of fluids (gases, water, oil, alcohol...). They are characterized by excellent precision over a wide range of flow rates from 1.6 µL/min to 500 mL/min. Four versions are available depending on the range of flow rates and the accuracy you need (0.2% or 2%).
General
These Coriolis mass flow sensors do not need periodical calibration and maintenance and this is one of their great advantages! In addition, they allow an extremely precise and real-time measure of fluid flow.
The sensors can be used with a very wide range of gases and liquids (water, oils, alcohols, mixed solutions/buffers) and the gathered results are independent of the working conditions (pressure, temperature, density, viscosity).
Benefits
- High accuracy
- Direct mass flow measurement, independent of fluid properties
- Bi-directional measurements
- Fast response
The device allows you to work with different types of fluids at the same time. A sequential injection of liquid and gas is possible! The sensor together with its software can measure the flow rate in real-time with high precision and adjust the pressure of the controller accordingly in a highly efficient feedback loop.
The device has a USB port to directly connect it to your computer (the USB cable is included) and you do not need a control station. Dedicated software comes with the device and allows you to easily control the sensor and gather all the measures. The working principle is based on the measurement of the mass flows (positive and negative) and additional parameters such as volume, flow rate, temperature, and density are shown as well.
Content
1x BFS Coriolis Mass flow sensor
1x Power supply
1x Documentation
1x Mounting block/shock absorber base
1x Sensor-to-RS232 cable
1x RS232/USB converter
1x Set of Ferrules for 1/16" OD tubing
1x 1/8" to 1/16" Swagelok stainless steel reducer (BFS2 and BFS3 only)
1x Bronkhorst calibration certificate (BFS1+ only)
Free software ESI available, get the latest version here.
Specifications
| Coriolis Flow Sensor |
BFS 1 |
BFS 1+ |
BFS 2 |
BFS 3 |
| Flow range |
0.1 g/h to 200 g/h |
1 g/h to 2000 g/h |
30 g/h to 30000 g/h |
| Minimum flow rate (water) |
1.6 µL/min |
16.6 µL/min |
500 µL/min |
| Maximum flow rate (water) |
3.3 mL/min |
33.3 mL/min |
500 mL/min |
| PERFORMANCE |
|
| Mass flow accuracy liquids |
down to ± 2% of measured value |
down to ± 0.2% of measured value |
| Mass flow accuracy gases |
up to ± 0.5% of measured value |
| Repeatability |
± 0.05% of rate ± 1/2 (ZS X 100/flow) % based on digital output |
| Zero stability (ZS) (1) |
< ± 0.02 g/h |
< ± 0.2 g/h |
< ± 6 g/h |
| Density accuracy |
< ± 5 kg/m3 |
| Temperature accuracy |
± 0.5 °C |
| Temperature effect (2) |
Zero drift: ± 0.01 g/h/°C |
Zero drift: ± 0.02 g/h/°C |
Zero drift: ± 0.5 g/h/°C |
| Mounting (3) |
Any position, attitude sensitivity negligible |
| Device temperature |
0...70 °C |
| Response time (t 98%) |
0.2 s to fill the tubing then 35 ms |
| MECHANICAL PARTS |
|
| Wetted material |
Stainless steel 316L or comparable |
| Pressure rating |
200 bar |
200 bar; higher on request |
| Sensor inner diameter |
250 µm |
0.5 mm |
1.3 mm |
| Compatible Tubing size |
1/16" OD |
1/16" and 1/8" OD |
| Internal volume |
13 µL |
0.45 mL |
0.82 mL |
| Calibration certificate |
/ |
Available |
/ |
(1) Guaranteed at constant temperature and for unchanging process and environmental conditions.
(2) Depends on the flow rate, heat capacity fluid, T amb., T fluid, and cooling capacity.
(3) To be rigidly bolted to a stiff and heavy mass or construction for guaranteed zero stability. External shocks or vibrations should be avoided.
Documentation
BFS Flow sensor User Guide
Working Principle
This Mass Flow Sensor contains a uniquely shaped, single-loop sensor tube, forming part of an oscillating system. When a fluid flows through this vibrating tube, the Coriolis forces are generated and they bend or twist the tube. The extremely small tube displacements are detected by optimally positioned sensors and evaluated electronically providing superior flow measurement performances. The fluid cause a variable phase shift and the resulting output signal is strictly proportional to the real mass flow rate. The density and temperature of the fluid are secondary outputs.
The BFS Coriolis Sensor covers a wide range of flow rates and it is perfect for most microfluidic applications! Compared with the MFS Thermal Flow Sensor, one single BFS Coriolis Sensor can work with the flow rate of 4 different MFS Sensors. This allows you to perform different experiments with the same device while remaining thoroughly precise.
