3.4 Process chemicals
DEKO 190 GT ward washer disinfector is equipped with one
machine can be equipped with a descaling liquid pump.
Please note that the nature of the item to be processed can
require additional actions such as dismantling for separate
-
ble sites) by a manual process etc. prior to the item being
processed by the machine. Such pre-cleaning can be
necessary to reduce the initial bioburden and/or contamina-
tion. Please consult the manufacturer of the medical device
for processing instructions and note that the cleaning agents
and disinfectants used by manual processing must be
loaded into the washer-disinfector. Failure to do so, may
cause excessive foaming and/or pressure drop in the water
extending the cycle time.
Depending on the materials of the medical device being
processed a variety of different cleaning agents may be
used. Generally, detergents shall be liquid, non-foaming,
non-abrasive, free rinsing and biodegradable and have the
authorities’ approvals for their intended use, as required.
For chromium steel alkaline detergents in the pH range 8 --
14 are preferred. Acid based detergents should only be used
for stainless steel items. Medical devices made of aluminium
Please note that different chemicals may require different
process temperatures and times e.g. enzymatic cleaners a
temperature between 30 - max 45°C whereas an alkaline
one a temperature between 60 to 90 degrees. The instruc-
tions from the manufacturer of the chemical e.g. regarding
the concentration and temperature shall be followed. Volume
of water in the washing phase is 11 litres.
Please follow the instructions of the manufacturer of the
chemical additive for safe handling, data on the biocompati-
bility (e.g. the maximum permitted residual level on devices).
Note that the residual level, which can be tolerated, will
depend upon the nature of the chemical and the intended
may not be achieved if other process chemicals than those,
which have been tested during type testing, or separately
with certain process variables, are used.
Note.
chemical supplier the suitability for chamber material AISI
304 (EN 1.4301, BS 304 S31) and chemical dosing system
materials PVC and Silicone.
Chemical hoses are marked with the symbols:
Detergent:
3.5 Detergent requirements
•Use only liquid detergents.
•The detergent must not foam. Even a small amount of foam
will substantially decrease the cleaning effect.
•In case there is plenty of foam in the system the machine is
unable to clean the goods and the automatic foam removal
control will start. The machine will take clean water in and
•The liquid must be free of particles so that the nozzle or the
valves of the detergent pump will not get blocked.
•Normally detergents being used are highly alkaline with a
pH-value between 10 and 14.
•A strongly alkaline liquid will corrode aluminium and its
colouring.
•Please use special washing agents for aluminium items.
•The detergents are powerful and must be handled with
care.
•In case of accidental contact with the skin or clothing wash
immediately
•with clean water. For eyes, seek immediate medical
attention.
•Tighten the stopper properly in order to prevent accidental
spilling. If air tight it could implode container.
•Recommended dosage is normally 2–5 ml/l.
•The used concentration of detergent is related to
– the degree of water hardness
– the degree of uncleanness
– the water temperature
•Usually the temperature of washing water should be
approx. +60 0C, in case of blood somewhat lower.
Detergents are powerful and must
be handled with care. In case of
accidental contact with skin or
clothing rinse immediately with
plenty of clean water.In case
detergent gets in contact with eyes,
seek immediate medical attention.
10
