Wittmann Tempro basic C 90 - Heat Transfer Medium

Tempro basic C 90 & Tempro primus C 90
Page 48
BASIC & PRIMUS C90 V 3.0 english / 10.04.2012
10.2 Heat Transfer Medium
The use of water as heat transfer medium is preferred. The filling of the tool
circuits takes place automatically via the cooling water entry.
CAUTION To keep the soiling and calcification as little as possible, a suitable
anticorrosive agent and hardness stabilizer should be used in the central water
treatment.
Requirements and Care for the Water in Cooling Circuits and Temperature-
Control Units!
There are various requirements for the cooling water (system water) regarding
water quality depending on the type of the facility to be cooled or temperature-
controlled. In order to protect the system components from corrosion and deposits
Wittmann Kunststoffgeräte GmbH recommends always treating the water
with a suitable agent, for example with ST-DOS H-390 (corrosion protection with
non-ferrous metal protection and hardness stabilisers).
We recommend carrying out regular water analyses in order to monitor the water
quality. Furthermore the following water quality* must be upheld depending on the
installed materials, the temperatures and the procedures.
Requirements in principle:
*free of solid
matter
The following are also required:
1. Systems with stainless steel (particularly for V2A steel, 1.4301)
Chloride Cl
-
Temperature < 50 °C max. 100 mg/l
Chloride Cl
-
Temperature 50 to 90 °C max. 50 mg/l
Chloride Cl
-
Temperature > 90 °C max. 30 mg/l
Chloride Cl
-
Temperature > 180 °C max. 5 mg/l
Water Parameter
Target Value
System Water
Unit
pH-value 7.5 –9.0 -
Conductivity (25°C) < 150 mS/m
Total hardness < 15 °d
Carbonate hardness < 4 °d
Carbonate hardness with hardness
stabilisation
< 15 °d
Chloride Cl
-
< 100 mg/l
Sulphate SO
4
2
-
< 150 mg/l
Ammonium NH
4
+
< 1 mg/l
Iron Fe < 0,2 mg/l
Manganese Mn < 0,1 mg/l