6 | Operation Manual MIDIDOS E | Safety
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 recommended, depen-
ding 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 dosing
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 necessary,
must be further tightened using the appropriate tools.
CAUTION!
CAUTION!
CAUTION!
WARNING!
