JULABO FPW91-SL Ultra-Low Refrigerated Circulators - Manual (Page 31)

SL
31
5.4. Filling / draining
Notice:
• Pay attention to the thermal expansion of bath oil during heating to avoid
overflowing of the liquid.
• Do not drain the bath fluid while it is hot!
Recommendation: Temperature range 5 °C to 40 °C
Check the temperature of the bath fluid prior to draining (by switching the unit on
for a short moment, for example).
• Store and dispose the used bath fluid according to the laws for environmental
protection.
19b 19a
S o l l w e r t 1 6 5 . 5 ° C E x t e r n I s t : 1 2 4 . 7 ° C L e i s t u n g : 5 0 % R e g e l u n g : i n t e r n
° C ° C
1 6 2 4
0 3 2
0 8 4
Filling
Take care that no liquid enters the interior of the circulator.
Remove the bath cover and, if necessary, use a funnel.
Observe the level indication (19b).
• Recommended maximum filling level with water as bath
fluid: 30 mm below the tank rim
• Recommended maximum filling level with bath oils:
40 mm below the tank rim
Special unit with bath opening 28x23 cm
L
After filling, immerse the samples in the bath, or place the
lid on the bath if the opening is not to be used.
L
The circulator has an early warning system for low level
(see description on page 38) that may be triggered when
changing samples in the bath.
Draining:
• The drain tap is located behind the venting grid on the
front of the unit, which can be taken off by removing 4
screws.
• Slide a short piece of tube onto the drain connection and
hold it into a container.
• Loosen the drain screw a few turns and drain the unit
completely.
• Tighten the drain tap.
Penetration of ice flakes/water into bath oil
At working temperatures below 0 °C humidity from the atmosphere may
penetrate into bath oil through condensation. This may subsequently
result in the formation of ice flakes, preventing the pump from proper
operation.
For this reason, the bottom of the bath tank provides a groove sloping
down towards the drain tap. Thus water having penetrated into the bath
oil gathers in the groove immediately behind the drain tap.
Shut down the refrigerated circulator at a bath temperature of +10 °C.
Wait for a while and open the drain tap to drain the water.