Broader Range, Non-invasive pH Monitoring

Self-adhesive pH Sensor Spots SP-LG1-SA

These new pH Sensor Spots cover a broader measurement range from pH 4.0 to 7.5, and are therefore optimally suited for bioprocess development, pharmaceutical applications and different fields of research. Due to their optical isolation and the optimized spectral properties the pH sensor spots are less sensitive to interfering fluorescences. The self-adhesive technology eases integration of the SP-LG1-SA in transparent glass or plastic vessels. They can simply be stuck on the inside surface and measurements can be taken non-invasively from the outside through the vessel wall. These sensor spots are available irradiated or untreated. They come pre-calibrated and ready-to-use.

  • Non-invasive, online pH measurements from pH 4.0 to 7.5
  • No electrical interferences due to optical measurements
  • No assembly necessary, ready-to-use
  • No electrolyte to replenish
  • Pre-calibrated, one-point calibration possible
Get a quote Place an order


Bioprocess Development: pH Monitoring in Shake Flasks

The pH is one of the major issues in the cultivation of cells, yeast or bacteria. Shake flask cultures are widely applied in academic and industrial bioprocess development. As adequate methods for real monitoring of pH were not available, cumbersome at-line sampling was used. The combination with non-invasive oxygen sensors in shake flasks provides new insights into metabolic activity and changes in metabolic pathways.


*provided pH sensors are used without further handling in physiological solution
**equilibrated sensor kept in well stirred solution at + 37 °C
Measurement range4.0 - 7.5 pH
Resolution at pH = 6.5± 0.01 pH
Measurement temperature rangefrom + 5 °C to + 50 °C
Response time (t90)**< 120 sec.
CompatibilityAqueous solutions, methanol (max. 10 % v/v), pH 2 - 10
Cross-sensitivityReduced ionic strength (salinity)
Cleaning procedurepH spots are delivered either beta-irradiated or untreated, a second irradiation or ethylene oxide treatment is not recommended
CalibrationpH spots are pre-calibrated; re-calibration is possible
Storage Stability18 months provided the sensor is stored in the dark
Carrier materialsAdhers to nearly all surfaces like glass, polystyrene, polyethylene, polymethacrylate (acrylic glass), polycarbonate. The sensor does NOT adhere to silicone surfaces!

Related products

pH-1 SMA LG1 compact fiber optic pH meter

pH-1 SMA LG1

This small pH meter can be set up almost anywhere. It is…

Multi-parameter system SFR vario

SFR vario

The SFR vario offers online monitoring of oxygen, biomass…

Integration Set for Sensor Spots IS-SP with suction pump

Integration Set for Sensor Spots IS-SP

The integration set is a suction pump that comes with…



Presens TV

Watch tutorials, webinars and informative videos about PreSens optical sensor systems.

All videos