Connection Of External Circuits - Lauda Alpha A Operating Instructions Manual

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There is a risk of electrochemical oxidation with the use of racks of non-ferrous metals or non-
ferrous metal samples.
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The LAUDA Alpha thermostat tanks are produced in stainless steel 1.4301 and are accordingly
resistant to mechanical and chemical stresses.
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Due to the different electrochemical potentials of metals electrochemical oxidation may occur in
the case of direct contact between the tank and a rack (for example copper) and the bath may
corrode despite the use of the highest quality materials for the tank.
Avoid the use of this type of rack or the direct contact with this sort of rack or contact with non-ferrous
metal samples and the inside of the container. Use original LAUDA stainless steel racks and com-
mercially available racks in temperature-resistant plastics!
6.4

Connection of external circuits

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If the cross-section of the tubing is too small  temperature drop between bath and
external system due to low flow rate. Increase the bath temperature appropriately.
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Always ensure the maximum possible flow cross-section in the external circuit!
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If the external consumer is placed at a higher level than the thermostat, the pump
is stopped and air penetrates into the thermostating circuit, the external liquid may
drain down into the bath even with a closed system  danger of flooding the
thermostat!
Protect tubing with hose clips against slipping off!!
When no external consumer is connected to the thermostat, the pump outflow
connection must be linked to the return (pump connection link).
Operation as circulation thermostat
Pump connection is standard for cooling thermostats and
available as accessory for immersion and heating thermo-
stats.
Assembly for immersion/heating thermostats only:
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Pull out the mains plug!
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Fix the external circulation set at the bottom of the con-
trol head by means of the two screws (pan head with
cross recess). The external circulation set belongs to
the right side of the head.
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Hang the thermostat into the bath and fix the clamp
with the knurled thumb screw on the edge of the bath.
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When used as circulation thermostat, care for shortest
hose connections with largest inner diameter as possi-
ble. This gives the best flow.
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Connect 9 mm internal diameter tubing to the pump
connector.
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Pump connections
– return to bath
– pump outflow or pump pressure side.
Pump connection link (silicone rubber)
Preparations
Alpha
June 20, 2018/ YACE0092