Routine maintenance precautions for Karlsham moisture meter

Routine Maintenance Notes for Karlsham Moisture Analyzer:

1. Most instruments use a polarized dual platinum electrode to measure voltage. After a period of use, certain Karl Fischer reagents and samples will fail the electrode response, the endpoint recognition will be delayed, and the endpoint color will turn brown instead of yellow. At this point the electrode must be cleaned. When cleaning, the electrode is usually placed in an ultrasonic bath with deionized water or ethanol for several minutes, or in chromic acid for 60 seconds, and then rinsed with deionized water or ethanol (drying before use). Table 3 lists the types of contaminants and their cleaning methods.

Table 3: Contaminant Cleaning Methods Contaminant Types: Cleaning Agents Fats, Oils, Mixtures of Chloroform and Toluene Polar Compounds, Dimethyl Formamide Salts, Carboxamides Polymers, Alcohol, Acetone, Ether Pigments, Diluted Bleach 2. Under normal conditions, the drift of the instrument is a few microliters per minute (refers to the amount of Karl Fischer reagent consumed per unit of time to keep the titration cell dry; this reagent On one hand it is used to titrate the water in the titration cell, on the other hand it compensates for the iodine consumption caused by the slow side reactions). If the drift value becomes large, you must check the moisture sealer or consider regenerating the molecular sieve. During regeneration, the molecular sieves are dried in a drying oven at 160-300° C. for at least 24 h. For molecular sieves installed on waste water bottles, because they contain water and sulfur dioxide, they must be cleaned with distilled water before regeneration.

3. The burette is cleaned with an ethanol solution. Do not place the burette above 40°C. The connecting O-rings and rubber pads must not be placed in organic solvents.

4, moisture meter instrument internal self-test system, if the instrument fails, will give the corresponding fault signal. As long as the user compares the instrument instructions, they can understand the cause of the failure and eliminate it in a targeted manner.

5, the instrument must be placed in a dry and clean environment, and arrangements for safekeeping; if you do not use for a long time, you must extract all the reagents in the instrument, and all the tubes are cleaned and air dried.