R Series
30934 V2
Operating Manual
Page 6
www.grantinstruments.com
To ensure protection the overtemperature cut-out must be set appropriately for
the heat transfer liquid selected (see table below).
If using non-recommended heat transfer liquids it is important to set the over-
temperature cut-out to a value no higher than 25°C below the fire point of the
liquid.
Use fume extraction when using silicone fluids at elevated temperatures
Temp range
Recommended liquid
Comments
-50°C to 50°C
Silicone oil
– low
viscosity
Bayer silicone M3. Follow the manufacturer’s
instructions. For safe disposal consult your
local regulations.
-30°C to 30°C
50% water, 50%
antifreeze (inhibited
ethylene glycol)
WARNING: Ethylene glycol is toxic
– follow the
manufacturer’s instructions.
For safe disposal consult your local
regulations.
Use a lid to reduce the dilution of the mixture
caused by condensing water vapour from the
air, and to maintain the cool down rate.
0°C to 30°C
80% water, 20%
antifreeze (inhibited
ethylene glycol)
5°C to 99.9°C
Water*
Water can be used but care should be taken
above 60°C as hot vapour can be dangerous.
Use a lid or polypropylene spheres above
60°C to ensure good performance & reduce
evaporation.
At temperatures approaching 99°C the
temperature performance will be affected due
to localised boiling.
The units should not be used to boil water.
70°C to 120°C
Silicone fluid
Viscosity ~20cs
Flash point ≥230°C
Fire Point ≥280°C
Dow Corning DC200/20 silicone fluid is a
suitable liquid
– follow the manufacturer’s
instructions.
For safe disposal consult your local
regulations.
* See section 7.1 for further details