Bioreactor pH Probes

Bioreactor pH probes are highly reliable measurement tools designed to support ideal growth conditions, batch-to-batch consistency and to help maintain quality attributes in diverse microbial or cell culture environmental process conditions. METTLER TOLEDO offers a full range of bioreactor pH probes with excellent repeatability for the most critical product applications. The pH probes for bioreactors are designed to withstand sterilization and harsh CIP conditions and are available with Intelligent Sensor Management (ISM) advanced diagnostics to prevent pH sensor failure during long batches.

For bioprocessing, bioreactor pH probes with a pre-pressurized liquid electrolyte reference system are typically the best choice, because they show the highest reproducibility through several sterilization cycles.

The InPro 3100 is a pH sensor that uses a gel electrolyte, while the InPro 3250 and 3253 are pre-pressurized, liquid filled pH sensors. Designed with silver-ion traps, both the InPro 3100 and InPro 3250-53 are especially helpful for reducing long-term sensor maintenance by keeping the reference junction clear. In addition, the InPro 3250 offers a wide selection of different pH-sensitive glass membranes to consistently ensure the best measurement performance to meet your process demands. Both analog and ISM versions are available in a variety of lengths, optimal for different installation requirements. Available InPro 3100 sensor lengths include 120 mm, 150 mm, 225 mm, 325 mm and 425 mm. Available InPro 3250 sensor lengths include 120 mm, 225 mm, 325 mm and 425 mm.

Intelligent Sensor Management (ISM) technology offered with METTLER TOLEDO bioreactor pH probes provides a number of useful benefits that analog sensors cannot deliver. ISM advanced diagnostics help you manage the maintenance of your sensors throughout the run of your bioreactor. Plug and Measure installation is available, along with calibration and other information that is stored within the sensor. Self-diagnosing ISM electrodes used during fermentation or cell culture can specify if a sensor can be safely reused in the next batch. Finally, ISM provides simpler traceability and reporting for regulatory compliance.

If a pH sensor fails during a fermentation process, dosing of chemicals must be interrupted, and saving the batch is only possible with lab pH measurement and manual adjustment at the bioreactor. Intelligent Sensor Management (ISM) technology offers powerful tools to minimize sensor failure. The digital signal output by ISM sensors is immune to interference, and corroded contact surfaces are also no longer an issue. ISM technology also offers pre-batch diagnostics to deliver precise information about sensor status. This can help predict when the sensor requires calibration or maintenance, or needs to be replaced. All of this data is available on the transmitter and on iSense sensor management software.