Lauda RA 12 Operating Instructions Manual page 23

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IMPORTANT: There are differences between "water and water"!
Tap water may be unsuitable for operation due to the calcium carbonate content  risk of calcification of the
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stainless steel tank.
High purity water (from ion exchangers) and distilled or bidistilled water are unsuitable for operation due to the
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corrosive properties of these media.  High purity water and distillates are suitable as a medium after the addi-
tion of 0.1 g of soda (Na
LAUDA Alpha thermostats can be operated ideally with LAUDA Aqua 90, available in container sizes of 5, 10 or
20 liters (order number LZB 120, LZB 220 or LZB 320) or with Kryo 30 ( 6.3).
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There is a risk of electrochemical oxidation with the use of racks of non-ferrous metals or non-ferrous metal
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samples.
The LAUDA Alpha thermostat tanks are produced in stainless steel 1.4301 and are accordingly resistant to
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mechanical and chemical stresses.
 Due to the different electrochemical potentials of metals electrochemical oxidation may occur in the case of
direct contact between the tank and a rack (for example copper) and the bath may corrode despite the use of
the highest quality materials for the tank.
Avoid the use of this type of rack or the direct contact with this sort of rack or contact with non-ferrous metal sam-
ples and the inside of the container. Use original LAUDA stainless steel racks and commercially available racks in
temperature-resistant plastics!
7/2022
CO , sodium carbonate) per liter of water.
2 3
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