SCHOTT TITRONIC universal, Operating Instructions Manual

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9 Maintenance and care of the TITRONIC
â â â â
universal Piston Burette
To maintain the proper functioning of the TITRONIC
â â â â
universal Piston Burette,
certain inspection and maintenance work has to be carried out.
Maintenance intervals
Normal operation:
Ü
As a principle, all work has to be done at max. intervals of 3 months.
Under special load:
Special load is present, for instance, if solutions are used which are likely to attack glass, e.g. alkaline,
fluoride-containing, phosphate-containing solutions, or if more than an average of 40 titrations are
performed per day.
Ü
Once per month the dosing unit has to be visually checked for damage.
Ü
Once a year the inspection according to DIN 12 650, Part 6 or Part 7, or to ISO DIS 8655, Part 3,
should be carried out, unless internal quality standards provide for different regulations.
Ü Once per quarter the electrical contacts (plugs, stirrer, manual key button) have to be checked for cor-
rosion if the TITRONIC
â â â â
universal Piston Burette is used in rooms the atmosphere of which occasion-
ally contains corrosive matters.
Ü
If there is a suspicion that a solution attacks the glass cylinder particularly seriously, the maintenance
intervals are to be shortened correspondingly.
In the case of disturbances:
Ü If any disturbance, malfunction, or another defect becomes obvious, maintenance work is required
immediately.
Ü If one has to assume that
!
safe operation is impossible
!
,
please observe chapter, “Warning and safety information“.
Maintenance work to be performed
Ü Check whether there is moisture below the dosing unit. To do so, remove the dosing unit (“Detaching
and placement of the dosing unit” chapter Fig. 27 to 30). If moisture is actually present, one can
conclude that the piston in the cylinder is no longer tight.
Ü Check the hoses, screwed connections, and seals for visible damage, contamination and leakage,
assembly of the screwed connections
& detailed sketch of Fig. 31.
Ü
Check the electrical plug connections for corrosion and physical damage.
Ü
Defective parts have to be repaired or replaced by new parts. Defective glass parts have to be replaced
in each case.
After each maintenance work a test of the metrological reliability according to DIN 12 650, Part 6 or 7, or
to ISO DIS 8655, Part 3 is required.
The test of the metrological reliability -including maintenance work- is offered as a SCHOTT-GERÄTE
service (including manufacturer’s test certificate, if required). For this purpose the TITRONIC
â â â â
universal
Piston Burette has to be sent to SCHOTT-GERÄTE.
Interruptions of use
Ü If the TITRONIC
â â â â
universal Piston Burette is not used for more than one week, the liquids contained in
the system should be removed, and the TITRONIC
â
â â
â
universal Piston Burette is to be rinsed with dis-
tilled water. If this is omitted the piston may be destroyed, and the TITRONIC
â
â â
â
universal Piston Burette
will become untight. In addition, if the liquid is left within the system, one has to reckon with the occur-
rence of corrosion and with a modification of the solutions used over time. Considering that state-of-the-
art technology does not offer plastic hoses which are totally free of diffusion for use with the
TITRONIC
â â â â
universal Piston Burette, special attention should be paid to the hose range.
Cleaning
Ü
The TITRONIC
â â â â
universal Piston Burette should be cleaned using a damp cloth and normal household
cleaning agents.
Ü
The bottom and the rear panel have to be treated dry. In no case must liquid penetrate into the interior
of the TITRONIC
â
â â
â
universal Piston Burette.