Now select ==>> to proceed to the next menu.
H BO
3 3
Drain Titr. Cell
Drain Sample
<<==
Select H
3
BO
3
and hold the operating control knob
depressed until water flows into the titration vessel.
Remove the PVC reagent tube for H
3
BO
3
out of the
container of distilled water. Hold the operating control
knob depressed until no more water flows into the titra-
tion vessel.
The H
3
BO
3
pump and delivery lines have now been
rinsed and emptied.
Select DrainSample and hold the operating control
knob depressed until the liquid in the sample vessel has
been drained and only air is being pumped.
Close the storage bottles.
Select Drain Titr.Cell and hold the operating control
knob depressed until the liquid in the titration vessel has
been drained and only air is being pumped.
Press the quick-release fastener downwards and
remove the sample vessel.
Push the steam delivery tube into its retaining notch.
By repeatedly pressing <<== you will return to the main
menu.
Do not forget to refill the reagent lines (page 15),
before again performing distillations.
Maintenance
Checking the steam delivery rate
If steam delivery lines, valves or distributors get clogged
the device cannot deliver the ncessary amount of steam
into the sample vessel. This can cause low analysis
results. For checking the steam delivery rate, there is a
test program 00. Its settings are:
Heating power 80%; Distillation time 300 seconds;
deliveries for dilution water, sodium hydroxide and boric
acid are set to zero. Time for “Drain Titr” is set to zero as
well, so you can measure or weigh the distillate that has
developed.
If it has not yet been done, switch the S 5 on. While
the steam generator is heating up, continue prepara-
tions:
Open the cooling water tap.
Take the pH electrode from the titration vessel and
put it into the electrode conservation vessel.
Empty the titration vessel and weigh it.
Insert the steam delivery tube into an empty sample
vessel. Press the quick release fastener down and
insert the sample vessel.
Check to insure that the sample vessel is firmly sea-
ted against the Viton stopper.
Close the protective door.
Caution! Sample vessel and distillation
head will become hot and may cause
burns!
During the test program keep the
protective door closed.
After distillation, do not touch the sample
vessel with bare hands. Use crucible tongs
or other suitable finger protection.
In the main menu, select Program.
Select Program No. 00.
Go <<== to the main mennu, and select Start.
Hot steam is delivered into the sample vessel and into
the distillation head.
When the program is through, take the titration vessel
out and weigh it or measure the distillate with a gradu-
ated cylinder.
If less than 100 ml of distillate have been formed,
steam delivery lines or distributors are probably
clogged. Ask the behr customer service.
When the test is done, depress the quick-release fas-
tener and remove the sample vessel.
Push the steam delivery tube into its retaining notch
.
Maintenance
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