Presens Frequently Asked Questions

Presens frequently answers questions from their customers. Anna decided to share two questions she frequently hears from our New Zealand customers.

Do you have additional questions? Be sure to contact Anna.

How do we test the stability of the sensor in an organic solvent? What is the best way to validate the measurement and correct working of the sensor?
— Presens Customer Question

Answer: The customer can perform the measurement in the organic solvent followed by a measurement in nitrogen. Correct measurement values in nitrogen proof that the sensor did stand the organic solvent.

How do I incorporate an optical DO sensor into a Minibioreactor with an 8 mm or 6 mm fitting? What is the outer diameter of the OIM probe? If it is too large, would it be possible to make an autoclavable probe with 4 mm diameter?
— Presens Customer Question

Answer: PreSens could offer a customized probe. The best option would be a dipping probe (steel tube) with 6 mm outer diameter. (The minimum length can be adapted to the customer's requirements.) However, the sensor spot in this customized probe is not exchangable, i. e. after 20 - 50 autoclavable cycles the customer needs to replace the entire probe.