Thermal gas flow sensor FS2 with long wires

Flow range from 0 to 1 m/s (half bridge mode), -20 °C to +150 °C, detection of flow direction

The Thermal gas flow sensor FS2 boasts excellent long-term stability and reproduceability. It detects flow direction and measures a flow range from 0 to 1 m/s (half bridge mode) and operates between -20 °C to +150 °C. 

Product Name
Measured medium
Gas Flow
Flow direction
Two directions (kalorimetric)
Operating temperature range
-20 °C to +150 °C
Chip size/dimensions
5.0 x 3.5 x 0.2 mm
Connection type
Enamelled copper wire
Wire dimensions
Ø 0.2 mm, 300 mm long
Flow range full bridge mode
0 m/s to 1 m/s resp. 0 ml/min to 50 ml/min
Flow range CTA mode
0/ms to 100 m/s resp. 0 l/min to 5 l/m
Response time t63
< 0.5 s
Response sensitivity
0.001 m/s (50 µL/min)

Product details

Product description FS2

The IST AG FS2 flow sensors are optimal for measuring gas flow and direction. The IST AG FS2 flow sensors are applicable in gas and offer excellent long-term stability. In addition to measuring flow rates, the FS2 gas flow sensor is able to detect flow direction with outstanding sensitivity. The FS2 is made of ceramic and glass which are inert, even if used in direct contact with 100% oxygen.


Benefits & Characteristics of the FS2

  • Simple signal processing
  • Simple calibration
  • Bare sensor resists up to +450 °C (customer specific)
  • Stable platinum technology
  • Excellent reproducibility
  • No moving mechanical parts

Customer-specific sensor available upon request


Consistent with the well-known, high-quality standards in Switzerland, IST AG is certified according to ISO 9001:2015 (quality) and ISO 14001:2015 (environment).  Appropriate processes are part of our daily work. They are regularly audited and extended parallel to the growth of our company. 

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