5 Commissioning
5.1
LAUDA heat transfer liquids
Please note the following:
n
The heat transfer liquids each cover a recommended temperature range
and must be suitable for the temperature range associated with their
application.
n
The heat transfer liquid becomes more viscous in the lower limit of the
temperature range and affects temperature stability as well as the pump
power and cooling capacity. The formation of vapors and odors increases
in the upper range. Therefore, only fully utilize the temperature range
when absolutely necessary. In particular, ice forms with Aqua 90 (water),
which can lead to the destruction of the device.
n
Never use contaminated or degenerated heat transfer liquids.
n
You can request a copy of the safety data sheets for the heat transfer
liquid at any time, if necessary.
Table 8: Approved heat transfer liquids
LAUDA
designation
Chemical
characteriza-
tion
Temperature
range in °C
Viscosity (kin) in
mm²/s at
(at 20 °C)
Viscosity (kin) in
mm²/s at
temperature
Container size
Catalog number
5 L
10 L
20 L
Kryo 30
Monoethylene
glycol/water
mixture
-30 – 90
4
50 at -25 °C
LZB 109 LZB 209 LZB 309
Aqua 90
Decalcified
water
5 – 90
1
---
LZB 120 LZB 220 LZB 320
Please note the following with regard to Kryo 30:
n
The water content decreases during longer periods of operation at
higher temperatures and the mixture becomes combustible (flash point
at 119 °C). Check the mixing ratio using a hydrometer.
n
The proportion of alkaline earth ions in the water must be between
0.71 mmol/L and 1.42 mmol/L (equivalent of 4.0 and 8.0 °dH). Harder
water leaves limescale deposits in the device.
n
The pH value of the water must be between 6.0 and 8.5.
n
Due to their corrosive properties, distilled, deionized, fully desalinated
(FD) water, or ocean water cannot be used. High-purity water and
distillates are suitable as a medium after 0.1 g of soda (Na
2
CO
3
, sodium
carbonate) is added for every liter of water.
n
Avoid chlorine content in the water at all costs. Do not add chlorine
to the water. Cleaning agents and disinfectants, for example, contain
chlorine.
n
The water must be free of impurities. Water with iron content is unsuit-
able due to rust formation and untreated river water is unsuitable due to
algae growth.
n
The addition of ammonia is not permitted.
Heat transfer liquid, water
V07
Microcool
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