FAQ FAQ - Frequently Asked Questions
How to store SCHOTT electrodes?
Redox sensors and pH sensors should be kept in the solution with which the reference electrode is also refilled (submerge up to the diaphragm). In most cases, this is KCl solution (3 mol/l, type no. L 300). Low-maintenance electrodes are also kept in KCl solution. Conductivity measuring cells, after being cleaned and rinsed-off with distilled water, can be stored in a dry location. How to carry out measurement correctly?
With refillable pH sensors and redox sensors, the refilling opening must be opened in order to carry out the measurement. The sensor is then submerged in the measuring medium at least up to the diaphragm. With refillable sensors, it is important to pay attention to the filling level of the electrolyte solution (see Refilling) . Between measurements, the sensor should be rinsed-off with distilled water but not wiped off. Excess droplets can be carefully sponged-off. How to calibrate SCHOTT pH electrodes?
Since the measuring characteristics of pH sensors change with time, they must be calibrated at regular intervals using appropriate buffer solutions. If buffer solutions from bottles are used, the bottles must be closed immediately after use. The buffer solution used should never be put back into the bottle but must be discarded instead. If very accurate calibration is necessary, we recommend DIN single use ampoules that always contain fresh high precision solutions. Redox sensors are not calibrated. Their proper function can be checked using the appropriate test solutions. For conductivity measuring cells, the cell constant should be checked and adjusted at regular intervals with test solutions. Greater variations in the cell constants are an indication of soiling or damage. How to refill SCHOTT BlueLine electrodes?
Refillable pH sensors and redox sensors are refilled with electrolyte solution so that the filling level of the electrolyte solution is at least 5 cm above the level of the measuring medium. With BlueLine electrodes, the easiest way to carry out the refilling operation is to pump the electrolyte solution into the electrodes using a small dispensing bottle. How to clean electrodes?
A soiled reference electrode should be emptied, rinsed with electrolyte solution and then filled again with electrolyte solution. In case of soiling of the glass membrane or diaphragm, it should be cleaned in order to maintain the measuring function. Depending on the degree of soiling, only the glass membrane or the glass membrane with the diaphragm is submerged in the cleaning solution. Cleaning agents that may have penetrated into the electrode must not be allowed to get into the reference system; if required, the reference electrode must be rinsed-off with distilled water and electrolyte solution. Depending on the degree of soiling, the methods mentioned below are recommended. After being cleaned, the sensor should be rinsed-off with distilled water, conditioned in electrolyte solution for 1 hour or longer and then recalibrated prior to performing any further measurements.
|