- Food industry, also for paste-like media
- Beverage production/bottling
- Pharmaceutical industry - SANITARY
- Fermentation - Biotechnology
- Water/sewage treatment
- Paper production
- Quality control
The probe carrier of the pH Reiner probes is made of steel that guarantees high mechanical resistance (e.g. to turbulent flow produced by agitators or solids). Therefore, the pH Reiner probes can be directly exposed to the product flow, thus sensing the pH immediately, directly and close to real time without a protective cage or similar devices. The steel itself is protected against corrosion and product incrustation by highly resistant, anti-adhesive PfaudlerPharma Glass (PPG).
The actual sensor consists of pH-sensitive enamel that is fused on to the lower end of the enamelled probe carrier in an annular shape. It covers the entire perimeter of the lower end of the probe.
The area of the measuring probe is a multiple of that of glass electrodes. Therefore, precision measurements of the pH can even be carried out in those media in which measurement ceased to the possible using other methods. Examples include liquids with a very low electrical conductivity.
The enamelled measuring probe is directly connected to its metal conductor. The weak point offered by internal buffers/discharge electrodes is avoided. In contrast to conventional glass electrodes, the pH enamel is in contact with the fluid on one side only. Aging of the probe or measured value drifts are therefore not possible.
The reference electrode is integrated in the probe head, separately from the measuring electrode. The electrolyte connection between the electrolyte vessel, the reference electrode and the product to be measured is made using a tube and quick-action coupling and a shrunk, aseptic ground diaphragm.
A sterile Pfaudler electrolyte (3 Mol KCl solution) is used as a standard. In the corresponding applications, infusion solutions such as a sterile saline solution, may also be used. The electrolyte is supplied in PE bottles with a septum that are placed in a stainless steel pressure vessel. The electrolyte bottles can be replaced without affecting the sterile condition of the system.
The pressure inside the electrolyte system is always kept well above the operating pressure inside the reaction chamber of the pipe. There fore, no product may leak through the diaphragm and through the electrolyte line up to the reference electrode. Contamination
of the reference electrode is entirely excluded.
Temperature compensation of the pH measurement is carried out using an integrated Pt 1000. The pH Reiner probe is installed directly in a reactor nozzle or in the main current
of a pipe. It may remain in the process zone all the time - even if the reactor is empty. The probe can be installed in any orientation and may remain dry without any limitations.
The pH Reiner probe can be sterilized inline at 134°C without losing its characteristics.
The measuring accuracy of conventional systems normally changes considerably already after a single heating and cooling cycle, making frequent recalibration necessary.
Due to its very construction, aging of the pH Reiner sensor or a measured value drift are not possible, in contrast to conventional measuring methods. Normally, it is entirely sufficient to calibrate the probes once per year directly with the product (single-point calibration).
For more information click here
pH Probe Reiner in Aseptic Design