Cleaning Recommendations for DMA 35
Careful cleaning of the oscillating U-tube of digital density meters is of crucial importance for obtaining good results.
1 Introduction
The measuring cell of the DMA 35 portable density meter is a U-shaped glass tube made of high-quality DURAN borosilicate glass. It should never be cleaned mechanically. All residues and contaminants have to be removed by rinsing only. The correct choice of cleaning agents will make cleaning faster and measurements more accurate.
2 Cleaning agents
Usually, two cleaning agents have to be used. The first cleaning agent ("agent 1") is the one that actually
cleans the cell. This means that this fluid must dissolve the sample. The second cleaning agent ("agent 2") must remove the first one (which is then already mixed with sample). It must not attack the Utube or leave any deposits, as drops of agent 2 will remain in the U-tube. If water is used as agent 2, it must be purified water to prevent limestone deposits.
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