A
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Connecting Hoses
14
9.
Connecting Hoses
Pump nozzle A:
front:
return flow from external object
rear:
outlet to external object (pressure side)
Hoses are normally used to connect the pump with an exter-
nal vessel. If objects are to be temperature controlled in the
internal bath only, the pump nozzles A can be closed with
a covering plate D attached with a union nut E (supplied as
standard). However, in order to achieve a better temperature
constancy, it is recommended not to close but to connect the
two nozzles with a short hose with a min. length of 50 cm.
General recommendations concerning the max. allowable
length of hoses cannot be given. It all depends largely on the
size, form and material of the external vessel to be tempera-
ture controlled. It should be understood that the length of a
hose and its diameter combined with the circulating capacity
have a large effect on the temperature control effectiveness.
Whenever possible, the decision should be made in favor of
the wider hose diameter and the vessel to be temperature
controlled should be placed as close as possible to the circu-
lator.
High operating temperatures will lead to high tem-
peratures on the hose surface, this is even more so
at the metal nozzles. In this case: DO NOT TOUCH!
The required hose material is dependent on the
heat transfer liquid used.
Hoses must not be folded or bent!
A wide radius should be used if turns have to be
made!
Hoses may become brittle after prolonged use or
they may get very soft. They should, therefore, be
checked regularly and exchanged if necessary!
Secure all hose connections using hose clamps!
9.1
Plastic hoses
It must be ensured that the hoses selected are fully suitable
for the particular application, i.e. that they will not split, crack
or become disengaged from their nozzles.
HAAKE circulators are supplied with Perbunan hoses as
standard. They have proven their versatility in the tempera-
ture range between - 30 to + 100
°
C.
Perbunan is resistant against water, alcohol and most oils.
The hose delivered as standard is not suitable for
temperatures below –30
°
C.!
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