Lenntech Testomat 808 Manual De Mantenimiento Y De Servicio página 29

General user instructions for Testomat
Basic design of the instrument
As a monitoring instrument, the Testomat
daily measurements. Several measurements per day are assumed under standard conditions of use. Should the
instruments be operated with longer periods between analyses (interval times), attention must be paid to appro-
priate flushing times and flushing water volumes respectively. In case of non-compliance residual or mixed water
from the hoses may be measured, leading to thresholds being exceeded. The indicator expiry date can also be
exceeded under certain circumstances.
Long interval times often make little sense. It may be that avoidable problems arise instead of achieving desired
savings. The water requirement per analysis also amounts to only 80 to 150 ml.
Switching off the instruments / Stopping the measurements
Interruptions to measurements should only be made using the functions, "Standby" (at the instrument) and "Stop"
(external) provided for this purpose. Switching the instruments off by disconnecting them from the mains does
not make sense because
–
when disconnected from the mains, the instruments can stop with their measuring chambers full of water
resulting in heavy soiling of measuring chamber, sight glasses and stirring rod
In this case, malfunctions due to an improper restart and unclear error messages cannot be excluded.
However, if instruments are switched off for several days, care should be taken to ensure that measuring cham-
bers are only filled with water and the restart is carried out in the same way as a first commissioning. At least the
dosing pump should be operated manually until the hose is emptied of air.
Initial start-up of new plants
For new plants we recommend flushing the pipelines thoroughly before connecting the instrument. We recom-
mend fitting a fine filter to the water supply hose - see our range of products. This filter should be cleaned or re-
placed at regular intervals because solid particles can clog the filter when operated for longer periods. If this is not
noticed, malfunctions and error messages caused by the reduced flow of water cannot be excluded. In case of a
correspondingly high concentration, particles can reach the solenoid valve despite the presence of a filter. This
could compromise its function.
Operation/Indicator
The proper operation of Testomat instruments can only be assured where original Heyl Testomat
are used. These indicators permit an exact analytic measurement of the smallest quantities of substances. As for
all reactive chemical substances, their effectiveness is also influenced by environmental conditions.
The shelf life data which we have calculated are based on use and storage at room temperature and the exclu-
sion of direct light. Deviating influencing factors and environmental parameters or those not tested by us can
result in a variation in the shelf life threshold.
The indicator must be replaced upon the expiry of its shelf life in order to guarantee its reliable function. Please
note the expiry date on the bottle's label.
Water inlet
Compliance with the water inlet pressure limits recorded on the rating plate is essential. Should the water flow be
insufficient, (e.g. also in case the filter is soiled) there is no proper exchange of measuring water and therefore a
clear analysis cannot be assured.
The measuring process can be repeated several times and ultimately result in error messages.
Water outlet
In assembly, care should be taken to ensure a discharge free of back pressure as described in the operating
instructions, "Water outlet".
®
808
®
808 has been designed for permanently monitoring water by means of
Testomat® 808 checklist
®
indicators
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