Lauda IN 550 XT FC Operation Manual page 132

132 / 171
CAUTION!
Contact with hot/cold heat transfer liquid
Scalding, cold burns
Bring the heat transfer liquid to room temperature for anal-

ysis.
Heat transfer liquid is subject to wear, such as cracking or aging (oxidation).
If necessary, the heat transfer liquid (e.g. if the operating mode is changed),
but at least every six months, must be checked for usability. Continued use
of the heat transfer liquid is only permitted following successful testing.
The heat transfer liquid must be tested as outlined in DIN 51529: Testing and
assessment of used heat carrier media.
Source: VDI 3033; DIN 51529
Integral process thermostats with flow control unit V4