Why is my FermProbe turning brown?

The longer the electrode is exposed to high temperatures (above 100 degrees °C) the darker it becomes. Likewise, the higher the temperature, the darker the colour. This is normal. If the electrode can be calibrated, it’s OK to use it.

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Are there different types of ports?

The electrode housing is designed to hold and protect the pH electrode while inserting it into the bioprocess vessel. There are various types of side entry ports and different groups of housings to fit each port type. The size and make of the port must first be identified in order…

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How do I match electrodes to housings?

Housings and FermProbe® pH electrodes are offered in a variety of lengths. This enables fermentation operators to select the optimum insertion length for the application at hand. The housing ordering information box lists the suitable electrode models and lengths for each particular housing style. There is another way to match…

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Why would I choose a longer electrode length?

Sometimes the tank wall can become coated with a thick layer of viscous material that does not mix well with the rest of the media. If the pH sensing bulb of the electrode is located just a couple of inches inside the tank wall, the bulb might be smothered by…

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How should I clean a FermProbe?

FermProbe® Cleaning Procedures Remove Bulb Coating Protein Deposition Warm water bath with dish detergent Warm water bath with enzyme detergent (i.e. Terg-A-Zyme®) Scrub bulb and rinse Inorganic Scale Deposits Dip only the bulb of the electrode into 0.1N hydrochloric acid Rinse Organic Oil or Films Clean with acetone and rinse Rehydrate…

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How should I compare grab sample and on-line pH measurements?

Preface: There are potential problems when comparing a laboratory pH analysis or grab sample measurement with on-line pH measurement. In order to obtain reliable data when making comparisons between these two types of pH measurements, it is essential that the proper apparatus and procedures be incorporated as outlined below: Apparatus:…

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How do I calibrate my pH electrode?

pH Electrode Calibration Procedure All pH electrodes require calibration from time to time. A two point calibration characterizes an electrode with a specific pH meter. Once an electrode is characterized, the electrode/meter pair can be used to determine the pH of a solution. Please follow the step-by-step procedure outlined below…

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Can I receive a Calibration Certificate?

Is it possible to receive a “calibration certificate” for pH electrodes? Broadley-James® electrodes are tested in NIST-traceable buffer solutions and their output is measured to see if it falls within an acceptable range. If so, the electrode receives a Quality Assurance Certificate which specifies the performance criteria. However, the electrode…

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How do I store my pH electrode?

When a pH electrode is not in use, the bulb should be kept in a wetted environment. Dehydration of the bulb will temporarily impair the electrode’s performance. The following storage procedure is recommended when the electrode is not in use. Short-Term: Immerse the electrode in 3.8M KCI solution (Broadley-James Part…

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