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SFR Online Measurement

SFR Online Measurement
Technical Data

Determines online pH and DO

The Shake Flask Reader (SFR) is an online measurement that determines valuable parameters such as dissolved oxygen and pH in shake flasks.

Performance characteristics

  • Rapid, parallel online monitoring of up to 9 shake flasks
  • For microbial cultivation and cell culture
  • Compatible with Kuhner incubator shakers
  • Non-invasive measurement
  • Optimization of growth conditions

Online Measurement

Online Measurement





Further information

Kuhner shaker

Integration into Kuhner incubator shakers

The SFR fits in all Kuhner incubator shakers. It is screwed directly on to any Kuhner universal tray (EU, EXU, FU).

The specialization provides monitoring of oxygen and pH in up to 9 shake flasks simultaneously. The corresponding ready-to-use flasks contain pre-calibrated sensor spots. The system monitors non-invasively through the transparent bottom of the flask. Different types and sizes of flasks are available. Plastic flasks contain pre-calibrated oxygen and pH sensors. They are ready-to-use for one cultivation. Glass flasks are equipped with autoclavable oxygen sensors.

Shake flask reader


Applicable for all Kuhner Shakers (V/W/X-serie)

Temperature range

 5°C - 50°C







± 0.01%O2 at 0.21%O2
± 0.1%O2 at 20.9%O2


< 0.015%O2 per day

Temperature range

up to 50°C



5.5 - 8.5


± 0.05 pH at pH 7 with one-point calibration
± 0.10 pH at pH 7 with precalibration


< 0.005 pH per day

Temperature range

up to 50°C

Technical data subject to change 

The following flyers provide information about the machines and function-specific solutions.

Kuhner shakers are suitable for the cultivation of microbial, plant, human and animal cell cultures. Find more information about the different application areas and suitable product recommendations for optimal cultivation here.

Stem cells
Cell culture
Plant cells & algae


Adolf Kühner AG (Headquarters)

Dinkelbergstrasse 1

CH-4127 Birsfelden (Basel)



We support our customers in implementation, maintenance and repair of all Kuhner products – efficiently and competently. 

GMP compliant production of shakers and bioreactors

For Kuhner, the quality and durability of their shakers and bioreactors have always been the topics with the highest priority. On this account, Kuhner products have also proven their worth worldwide under GMP requirements. Documentation, development and production along the full life cycle of our products are continuously enhanced to match the requirements of 21 CFR and GAMP 5.

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The world's most reliable shaking machines built in-house in Switzerland.

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