Service/maintenance
OPERATION MANUAL
Chapter 7
CC®-Immersion circulator
V2.4.0en/08.12.20//17.12
66
Oxidation
Oxidation ages the thermal fluid and change its characteristics (e.g. a reduced boiling point). When
controlling high temperatures, a reduced boiling point may cause overflow of very hot thermal
fluids. It may cause serious burns of the limbs.
Hygroscopy
When continuously thermoregulating below room temperature, hygroscopy causes the thermal
fluid to accumulate water in the course of time. Such a liquid mixture causes the evaporator to
burst when thermoregulating in the minus range. This is caused by the water in the liquid mixture,
which forms ice crystals on the evaporator. When thermoregulating high temperatures with such a
liquid mixture, the boiling point is reduced. When controlling high temperatures, a reduced boiling
point may cause overflow of very hot thermal fluids. It may cause serious burns of the limbs.
Hygroscopy can change the mixing ratio of a water-ethylene-glycol mixture.
7.5.2
Rinsing the thermal fluid circuit
Setpoint and overtemperature protection are not adjusted to the thermofluid
MORTAL DANGER FROM FIRE
The cut-out value of the overtemperature protection
must
be adapted to the thermofluid. Set the
cut-out value of the overtemperature protection 25 K below the fire point of the thermofluid.
The setpoint set during rinsing
must
be adjusted to the thermofluid used.
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«
.
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.
The inner components of the temperature control unit must be dried out Need to avoid boiling
retardation during future uses (e.g. use of a silicone oil at temperatures above about 100
°C).
PROCEDURE
Drain the temperature control unit as described on page 56 in section
»Draining the bath thermostat«
.
Residual thermal fluid can remain in the pump chamber and the internal lines after draining. Leave
the temperature control unit with open valves for a while.
Leave the drain hose mounted to the
>Drain<
[8].
Check the fill level in the collecting container at the end of the drain hose. Follow the instructions on
page 15, section
»Proper disposal of resources and consumables«
for the disposal of thermofluid.
Close the drain valves on the temperature control unit by turning them clockwis
e (turn 90° right
as far as it will go).
Example: Connecting a
short circuit hose
