Unauthorised Modification And Manufacture Of Spare Parts; Improper Operating Methods; Safety Of The System In The Event Of A Failure In The Dosing System; Technical Data - Grundfos DMH 251 Installation And Operating Instructions Manual

Warning
Make sure that the pump is suitable for the actual
dosing medium!
Observe the chemical manufacturer's safety
instructions when handling chemicals!
Do not operate the pump next to closed valves.
Warning
The pump housing, control unit and sensors
must only be opened by personnel authorised by
Grundfos Alldos!
Repairs must only be carried out by authorised
and qualified personnel!
Wear protective clothing (gloves and goggles)
when working on the dosing head, connections
or lines!
Before removing the dosing head, valves and
lines, empty any remaining medium in the dosing
head into a drip tray by carefully unscrewing the
suction valve.
The resistance of the parts that come into contact
with the media depends on the media, media
temperature and operating pressure. Ensure that
Caution
parts in contact with the media are chemically
resistant to the dosing medium under operating
conditions!
5.7 Unauthorised modification and manufacture of
spare parts
Modification or changes to the pump are only permitted following
agreement with the manufacturer. Original spare parts and
accessories authorised by the manufacturer are safe to use.
Using other parts can result in liability for any resulting
consequences.

5.8 Improper operating methods

The operational safety of the supplied pump is only ensured if it is
used in accordance with section
limit values must under no circumstances be exceeded.
Explosion-proof pumps are identified from the
pump and motor nameplates. An EC declaration
of conformity is provided in accordance with the
Note
EC directive 94/9/EC, the so-called ATEX
directive. This declaration of conformity replaces
the declaration of conformity in this manual.
Warning
To operate a pump which has been identified as
an explosion-proof pump for the dosing of
inflammable media or for operation in potentially
explosive operating sites in accordance with the
EC directive 94/9/EC, refer to the enclosed
manual "Operating an explosion-proof pump" in
addition to this manual.
If the assumption is made that a safe operation is no longer
possible, switch off the pump and protect it against
unintentional operation.
This action should be taken
• if the pump has been damaged.
• if the pump no longer seems to be operational.
• if the pump has been stored for an extended period of time
in poor conditions.
5.9 Safety of the system in the event of a failure
in the dosing system
DMH 25x dosing pumps are designed according to the latest
technologies and are carefully manufactured and tested.
However, a failure may occur in the dosing system. Systems in
which dosing pumps are installed must be designed in such a
way that the safety of the entire system is still ensured following a
failure of the dosing pump. Provide the relevant monitoring and
control functions for this.
6
data. The specified
6. Technical

6. Technical data

6.1 Identification

DMH nameplate
Fig. 1
Pos. Description
1 Type designation
2 Model
3 Maximum capacity [l/h]
4 Voltage [V]
5 Frequency [Hz]
6 Product number
7 Country of origin
8 Year and week code
9 Marks of approval, CE mark, etc.
10 Maximum pressure [bar]
11 Serial number