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  • All products
  • Gas flow sensors
  • SFM3xxx-AW/D

SFM3400-D

Proximal flow sensor for neonatal applications, single-use, 33 slm

The SFM3400 flow sensor is a proximal flow sensor for neonatal and pediatric applications in respiratory devices such as ventilation or anesthesia. The sensor is available as both a single-use version (SFM3400-D) and a reusable version (SFM3400-AW). The reusable solution is autoclavable and washable. The SFM3400 flow sensor features outstanding measurement accuracy and a short signal processing time as well as high robustness. The digital flow sensor measures bidirectional flow rates of up to 33 slm and is fully calibrated for air, N2 and O2 gases. The special design of the flow channel results in a low dead space volume of less than 1 ml. The sensor features standard medical cones for pneumatic connection to the respiratory cycle and has a mechanical interface for a simple and user-friendly electrical connection. Thanks to its performance characteristics, the SFM3400 mass flow meters are ideally suited for proximal flow measurements in neonatal and pediatric OEM applications, ventilation in hospitals, emergency situations and home care applications. Like all sensors of the successful SFM3xx platform, the SFM3400 is based on the innovative CMOSens® Technology, which combines the sensor element and processing electronics on a single, small CMOS microchip. The CMOSens® mass flow sensors offer robust and interference-free measurements and allow utilization of the very fast and precise sensor signal.
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Specification

Gas flow
Full scale flow rate
33 - 33
33 - 33slm
Typical accuracy
±3% m.v.
±3% m.v.
Calibration
AIR and O₂
AIR and O₂
Sensor output
Flow and T
Flow and T
Maximum operating pressure
1.1
1.1bar
Fluidic connector ports
Medical cone (22 mm)
Medical cone (22 mm)
Generic
Supply voltage
4.75 - 5.5
4.75 - 5.5V
Max. supply current
10000
10000uA
Interfaces
I²C
I²C
Size (LxWxH)
60 x 22 x 21
60 x 22 x 21mm

Downloads

Datasheet SFM3400

01/2024

File

366.0 KB

Datasheet01/2024PDF366.0 KB
Selection guide gas flow sensors

12/2025

File

563.3 KB

Application note12/2025PDF563.3 KB
SFM3x00 I²C Functional Description

05/2022

File

306.1 KB

Application note05/2022PDF306.1 KB
Sample code SFM3000

File

261.6 KB

SoftwareZIP261.6 KB
STEP file SFM3400

03/2024

File

3.3 MB

Drawings/CAD03/2024STEP3.3 MB
Product flyer SFM proximal flow sensors

04/2017

File

667.7 KB

Flyer04/2017PDF667.7 KB
Clip-on cap/cable evaluation kit

02/2025

File

498.6 KB

Application note02/2025PDF498.6 KB
High humidity applications

01/2021

File

342.0 KB

Application note01/2021PDF342.0 KB
Reference and flow conversions

09/2021

File

293.7 KB

Application note09/2021PDF293.7 KB
SEK-ControlCenter (all devices)

Link

SoftwareLink
STEP file SFM cap for AW/D type sensors

File

4.6 MB

Drawings/CADSTEP4.6 MB
REACH and RoHS declaration SFM/SGM

01/2025

File

122.8 KB

Certificate01/2025PDF122.8 KB
Gas flow sensors brochure

10/2025

File

497.6 KB

Flyer10/2025PDF497.6 KB

Sensor evaluation

Buy the following products to evaluate this sensor

NameDescriptionSeriesCategory
SEK-SFM3xxx-AW/D EvaluationskitGas flow sensors evaluation kit SFM3xxx-AW/DSEK-SFMxxxxGas flow sensors

SEK-SFM3xxx-AW/D Evaluationskit

Gas flow sensors evaluation kit SFM3xxx-AW/D

SEK-SFMxxxx

Gas flow sensors

Download the respective viewer software to start measuring

Go to download center

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SFM3400-D

SFM3400-33-D

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Global Distributors

Part numberQuantityDistributor nameCountryUploaded
SFM3400-33-D152Mouser Electronics Inc.27 countries16.02.2026Buy
SFM3400-33-D67Farnell, An Avnet Company10 countries16.02.2026Buy

APAC (Asia)

Part numberQuantityDistributor nameCountryUploaded
SFM3400-33-D67element14SG16.02.2026Buy

The Americas

Part numberQuantityDistributor nameCountryUploaded
SFM3400-33-D75Newark, An Avnet CompanyUS16.02.2026Buy