Technické pufry a čisticí roztoky (202950)
pH buffer solution
Technical buffer solutions as per DIN 19267 are used to calibrate (adjust) technical pH measuring devices (probe, cable and measuring amplifier). Buffer solutions with various pH values are available, the colored bottle caps serve for easy differentiation. The temperature dependency is indicated on a table on the bottle. The typical accuracy is +/-0.02pH units. The JUMO buffer solutions are traceable to standard reference material of NIST (National Institute of Standards and Technology). The minimum durability and the batch number are specified on the label.
Redox potential test solution
The Redox test solution as per ASTM D 1498 serves to check technical Redox measuring devices (probe, cable and transmitter). The output signal of older Redox probes can drift. In this case, the test solution allows to readjust the display values in the measuring amplifier. For probes with different reference electrodes and electrolyte concentrations, the three voltage values to be expected are printed onto the probes (Pt against Ag/AgCl; Pt against Ag/AgCl in saturated KCl and Pt against calomel). The minimum durability and the batch number are specified on the label.
Calibrating solution for electrolytic conductivity
The conductivity calibration solutions are used to calibrate (adjust) and check conductive and inductive guide value measuring systems in technical plants. The solutions are traceable to PTB and NIST. They consist of potassium chloride solution in various concentrations. The minimum durability and the batch number are specified on the label.
Auxiliary electrolyte (KCI refill electrolyte)
Throughout their use, pH and Redox probes lose electrolyte via the diaphragm; this is intended and indispensable for their function. Electrodes with fluid reference electrolyte (auxiliary electrolyte) can normally be refilled by the user. For this purpose, a potassium chloride solution (KCl) is required. A KCI solution free of silver ions (without silver chloride (AgCI)) is used for probes with cartridge control system. Probes with wire control require KCl solution with mit AgCI. Both types are available from JUMO. The KCl solution can also be used to store and activate used electrodes. The KCl solution neutralizes and dilutes electrode toxins in the area of the diaphragms and regenerates the pH-sensitive source layer of the pH membrane glass.
Diaphragm cleanser consists of a watery thiourea solution. This cleanser removes silver sulfide of low solubility from the diaphragms of pH, Redox and reference electrodes.
Electrode cleanser consists of a pepsin-hydrochloric acid solution and removes, among others, proteins and calcification from electrochemical probes.