Applications; Intended Use; Safety Of The System In Case Of A Failure In The Dosing Pump - Grundfos DMX 221 Installations- Und Bedienungsanleitung

5.2 Applications

5.2.1 Intended use

DMX 221 pumps are suitable for dosing liquid, non-flammable and non-combustible media strictly
in accordance with these installation and operating instructions. Do not use DMX 221 pumps in
potentially explosive environments.
DMX dosing pumps can only be operated in a safe and effective way, if they are installed properly
and the required ambient conditions are provided. Observe sections Location and Technical data.
Incorrect use
• The operational safety of the pump is only ensured if it is used in accordance with section
Intended use.
• The limit values specified in section Technical data must not be exceeded.
• The pump is not approved for operation in potentially explosive areas.

5.2.2 Safety of the system in case of a failure in the dosing pump

• In case of a diaphragm leakage, dosing medium may leak out of the hole in the intermediate
flange between the pump and the dosing head. The parts inside the housing are protected
from the dosing medium for a short time (depending on the type of medium) by the housing
sealing.
• Check monthly if medium is leaking out of the intermediate flange. In case of a diaphragm
leakage, immediately stop the operation of the pump and close the isolating valves on the
inlet side and outlet side.
• For maximum safety, we recommend the pump version with diaphragm leakage sensor.
Design your dosing system with monitoring and control functions to safeguard
the entire system.
WARNING
Chemical hazard
Death or serious personal injury
● Check on a monthly basis that dosing medium is not leaking out of the pump.
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