SLF3S-1300F –Next Level in Liquid Flow Sensing

The radically optimized mechanical design of the SLF3S-1300F and the newest flow micro-sensor take an already outstanding functionality to the next level in terms of price-performance ratio.

This is an archive article published 03/04/2020. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.


Sensirion liquid flow sensors use MEMS calorimetric micro-sensor placed inside a flow channel. 

Flow measurement is based on measuring the temperature of the fluid at two points.

The higher the flow rate, the higher the temperature difference. Micro-sensor itself is highly integrated and contains heater, two temperature sensors, amplifiers, ADC, signal processing, memory and I2C interface.


The sensor allows for the bidirectional measurement of flow rates up to 40 ml/min for both water and hydrocarbon-based fluids. The sensor is calibrated for water and IPA (Isopropyl alcohol). It uses the newest SF06 flow micro-sensor that measures both the flow and temperature. It also provides two additional status information: air-in-line and high flow.

The water flow rate measurement accuracy is 5% of the measured value for flow in range -20 to 20ml/min and 10% at 40ml/min; measurement accuracy for IPA is 10% in range -40 to 40ml/min.

After the sensor receives the “start continuous measurement” command, it enters the continuous measurement mode. Each measurement takes ~0.5 ms. Measured flow rates are averaged until you read them. The arithmetic mean is used for the first 100ms, and then the sensor uses exponential smoothing.

SLF3S-1300F uses standard fittings and I2C interface that allow simple integration into your product. For faster development and sensor testing, Sensirion offers SLF3S-1300F Kit and source code for Arduino UNO at Sensirion Developers website.

FYI: Do not allow the SLF3S-1300F to dry out with residual media inside the flow channel. Please, follow cleaning and clean handling application note.

If you are interested in any of the Sensirion products, or you need more information, we are ready to help you at


  • Straight, unobstructed flow channel without moving parts
  • Micro-sensor doesn’t have direct contact with the fluid
  • Chemically resistant wetted materials: polyphenylene sulphide (PPS), stainless steel 316L, epoxy-based adhesive
  • Response time below 20 ms
  • Compact dimensions: 48 x 15.5 x 8.8mm


The video shows what components the liquid flow evaluation kit includes and how to get started within a few minutes.

Do not miss these articles

Do you like our articles? Do not miss any of them! You do not have to worry about anything, we will arrange delivery to you.

Additional products

in stock 48 pcs


Mass/Liquid Flow Sensors

Liquid Flow Meter H2O, IPA 40mll/min I2C

Ord.number: 313519


1 pcs+ 95,00 €

100 pcs+ 87,40 €

250 pcs+ 77,00 €

  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
Evaluation Kit SLF3S-1300F SENSIRION
in stock 2 pcs

Evaluation Kit SLF3S-1300F

Development Tools

Evaluation Kit for SLF3S-1300F

Ord.number: 313521


1 pcs+ 184,00 €

  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
Do you agree with cookies being stored?
Welcome to the SOS electronic website. Before you enter our online world, we would like to ask you to allow us to store cookies on your browser. Your consent will help us view the site without error, measure its performance, and track additional statistics. Apart from that, we can bring you an offer of our products and services, literally tailor-made. We also provide cookies to third parties. However, you are definitely safe with us.
The proper operation of the website
More stable technical control
Better marketing offer

More about cookies
More about personal data processing