Copyright 2005 by ELTRA GmbH Germany – January 2005 – Operation Manual ON-900
1.7 Filling the cooling water
Before filling the cooling water, it is necessary to make sure that the analyser is properly
connected to the external barrel, see 2TU1.6U0T2T.
It is absolutely important that the inlet of the water pump inside the instrument, is connected
to the central tap (2) of the external barrel.
Procedures for filling up and bleeding the cooling system:
Open the external barrel and put the additive „COOLING AGENT„ into it. Fill up the
barrel almost completely with water.
Only drink water quality should be used and not any tap water which can pollute or
corrode the cooling system.
Close the barrel.
Open the air bleeder on the water pump.
Pour water into the small plastic water equalising tank above the pump, until some water
starts to exit the air bleeder.
Close the air bleeder.
Place a graphite crucible into the graphite tip.
Make sure that the carrier gas supply is closed, in order to avoid unnecessary gas
consumption during the following steps.
Remove the right side panel of the analyser. UCautionU ! Don‘t touch electric
components.
Observe the wheel of the water flow detector on the ON-21 board and switch the mains
switch to pos. 2 for a couple of seconds only and check during this short period if the
water flows.
Set the mains power switch immediately to position 1 if the water wheel doesn’t rotate.
It seams that the shaft of the water pump is jammed.
The pump can be damaged when power is applied and the pump will not rotate.
Reopen the air bleeder and add some more water into the equalising tank. Close the air
bleeder, switch back to pos. 2. Repeat this procedure until the system is completely free
of air.
When the cooling system is inactive or dry for a long period of time, it could occur that the
water pump doesn't start rotating when the mains switch is set to pos. 2
The following instructions will assist you in solving the problems:
Remove the right side panel of the analyser. UCautionU ! Don’t touch electric
components.
Remove the screw on the pump’s front place.
The screw that appears next is coaxial to the internal pump shaft, rotate it and the
jammed shaft will be loosened. Up to 10 rotations may be needed to restore back to
working order.
Re-install in reverse order.
Set the mains power switch to position 2.
If the water flow wheel rotates smoothly over a long period of time, the filling-up procedure
is complete.
If the rotation is erratic, then there is still some air in the cooling system.
Switch the mains switch back to pos. 1, reopen the air bleeder and add some more water
into the equalising tank.
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