Function description
Chapter 3
OPERATION MANUAL
V2.3.0en/07.06.19//17.12
Unichiller®
35
3.2
Information on the thermal fluids
Non-compliance with the safety data sheet for the thermal fluid to be used
INJURIES
Risk of injury to the eyes, skin, respiratory tract.
The safety data sheet for the thermal fluid to be used must be read prior to using it and its
content must be respected.
Observe the local regulations/work instructions.
Wear your personal protective equipment (e.g. temperature-resistant safety gloves, safety
goggles, safety footwear).
Danger of slipping because floor and work area are contaminated. Clean the work station and
follow the instructions for the disposal of thermal fluid and material on page 15 in Section
»Proper disposal of resources and consumables«
.
Non-compliance with the compatibility between the thermal fluid and your temperature control
unit
MATERIAL DAMAGE
Observe the classification of your temperature control unit according to DIN 12876.
Ensure the following materials are resistant with respect to the thermal fluid: Stainless steel
1.4301 (V2A)/1.4401 (V4A), copper, nickel, HNBR (Unichiller 017 to Unichiller 045), EPDM (from
Unichiller 055), red bronze/brass and silver solder.
The maximum viscosity of the thermal fluid must not exceed 50 mm²/s at the lowest working
temperature!
The maximum density of the thermal fluid may not exceed 1 kg/dm³!
Mixing different thermofluids in a thermal fluid circuit
PROPERTY DAMAGE
Do
not
mix different types of thermofluid (such as mineral oil, silicone oil, synthetic oil, water,
etc.) in a thermofluid circuit.
The thermal fluid circuit
must
be rinsed when changing from one type of thermal fluid to an-
other. No residues of the previous type of thermal fluid may remain in the thermal fluid circuit.
Designation
Specification
Calcium carbonate per liter
≤ 1.5 mmol/l; corresponds to a water hardness of: ≤ 8.4 °dH (soft)
PH value
between 6.0 and 8.5
Ultrapure water, distillates
Add 0.1 g of sodium carbonate (Na
2
CO
3
) per liter
Not approved water
Distilled, deionized, demineralized, chloric, ferruginous, ammoniacal, or
contaminated river water or sea water
Thermal fluid: Water without ethylene glycol
Operation without freeze protec-
tion*
do not use
Operation with freeze protec-
tion*
Please refer to the specifications in the data sheet in
. Additional
information on freeze protection is provided on page 59 in Section
protection for temperature control unit (optional)«
.
Thermal fluid: Water-ethylene glycol mixture
Thermal fluid composition
The mixture’s temperature must be 10 K below the permissible min. tem-
perature. For the permissible temperature range, refer to the datasheet
from page 85 in Section
.
To find out whether your temperature control unit is equipped with a freeze protection, refer to the datasheet in
.
We recommend the ethylene glycols listed in the Huber catalogue.
Thermal fluid: Water
