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1.11 Dosing of chemicals
CAUTION!
• When working on dosing systems, the accident prevention regulations applicable
on-site must be observed and the specified personal protective clothing is recom-
mended, depending on the hazard associated with the metered medium:
Googles
Protective gloves
Protective suit
• It is recommended that all people responsible for the installation and maintenance of
piping, hoses and accessories should wear this protective clothing.
• Before working in the dosing pump and plant, disconnect it from the power supply
and protect it from reconnection.
CAUTION!
• Any chemicals still present in the dosing head may spray out when the power supply
is reconnected. This may lead to caustic or other burns to the face and hands. The
dosing lines must always be reconnected before starting the pump up again.
• The chemical resistance of the pump’s materials of construction must be verified
before dosing with aggressive media!
• The dosing pump’s dosing head as well as connections and lines of the system may
be under pressure. Work carried out on the dosing system requires special safety
precautions and may be carried out only by instructed technical personnel.
CAUTION!
• Chemicals may spray out. This may lead to caustic or other burns. Always release
the pressure from the dosing pump system before starting work on the pump.
• Flush the pump with a harmless medium (mainly water) before working on the do-
sing head, valves and connections in order to avoid unintentional contact with the
dosing medium.
WARNING!
• Never look into the open end of a clogged line or valve.
Chemicals may emerge unexpectedly and cause caustic or other burns to hand and
face
• Before start up, all connections must be inspected for correct tightness and, if neces-
sary, must be further tightened using the appropriate tools.
CAUTION!
• If connections at the dosing head are loosened during operation for venting or other
reasons, the leaked chemicals must be removed professionally. This is the only way
CAUTION!
CAUTION!
CAUTION!
CAUTION!
CAUTION!
