Lauda ECO GOLD - Heat Transfer Liquids, Cooling Water and Hoses

09/2021 ECO Gold 35 / 134
6.4 Heat transfer liquids, cooling water and hoses
Note:
- Tap water is unsuitable for operation with the thermostat due to the calcium carbonate content. The bath vessel may
calcify.
- High purity water (from ion exchangers) and distilled or bidistilled water are unsuitable for operation due to the cor-
rosive properties of these media. High purity water and distillates are suitable as a medium after the addition of 0.1 g
of soda (Na2CO3, sodium carbonate) per liter of water.
- Water containing iron (rust formation), chlorine (pitting) and untreated river water ("algae formation") is unsuitable.
- The bath vessels of the LAUDA ECO thermostats are produced in stainless steel 1.4301 and are accordingly re-
sistant to mechanical and chemical stresses.
- Metals have different electrochemical potentials. Therefore, in the case of direct contact between the tank and a
frame (copper for example) electrochemical oxidation may occur. The bath corrodes despite the use of high quality
materials on the tank. Avoid the use of this type of frame or direct contact with it or contact with non-ferrous metal
samples and the inside of the container. Use original LAUDA stainless steel frames or commercially available frames
in temperature-resistant plastics.
a) Approved heat transfer liquids
LAUDA
designation
Operating
temperature
range
Chemical
characterization
Viscosity
(kin)
Viscosity
(kin) at
temperature
Flash
point
Container size
Catalogue number
°C
mm²/s at
20 °C
mm²/s
°C
5 L
10 L
20 L
Kryo 51
-50 – 120
Silicone oil
5
34 at -50 °C
120
LZB 121
LZB 221
LZB 321
Kryo 30
-30 – 90
Monoethylene
glycol/water mixture
4
50 at -25 °C
--
LZB 109
LZB 209
LZB 309
Kryo 20
-20 – 170
Silicone oil
11
28 at -20 °C
170
LZB 116
LZB 216
LZB 316
Therm 160 
60 – 160
Polyalkylene glycol
141
5 à 140 °C
260
LZB 106
LZB 206
LZB 306
Therm 180
0 – 180
Silicone oil
23
36 at 0 °C
250
LZB 114
LZB 214
LZB 314
Therm 250
50 – 250
Silicone oil
125
45 at 50 °C
300
LZB 122
LZB 222
LZB 322
Aqua 90 
5 – 90
Decalcified water
1
--
--
LZB 120
LZB 220
LZB 320
 At higher temperatures vaporization losses occur. In this case use a bath cover ( 9). Use distilled water or pure de-
mineralized water only after adding 0.1 g of soda (Na
2
CO
3
sodium carbonate) per liter of water. Otherwise there is
the risk of corrosion!
 The proportion of water reduces with longer working at high temperatures and the mixture becomes flammable (flash
point 119 °C). Check the mixing ratio using a hydrometer.
 Not suitable for polycarbonate baths.
Silicone hoses are not suitable for silicone oils!
EPDM hoses are not suitable for mineral oils!