Installation And Operating Instructions; Electrical Connections; Electric Servomotor (Optional); Electronic Preselection Counter (Optional) - Grundfos DMH 25 Serie Montage- Und Betriebsanleitung

6.8.1 Connecting a liquid-heated dosing head (optional)
As an option, liquid-heated dosing heads are available in
stainless steel.
2f
2f1
40
Fig. 22 Liquid-heated dosing head
Pos. Components
2f Dosing head, liquid-heated
2f1 Hose nipple, DN 10 connection
Required characteristics of heating liquid:
• The heating liquid must not chemically attack stainless steel.
• Maximum permissible pressure: p
• Maximum permissible temperature: t

7. Electrical connections

Make sure that the pump is suitable for the electricity supply on
which it will be used.
Warning
Electrical connections must only be carried out by
qualified personnel!
Disconnect the power supply before connecting the
power supply cable and the relay contacts!
Observe the local safety regulations!
The pump housing must only be opened by
personnel authorised by Grundfos!
Protect the cable connections and plugs against
corrosion and humidity.
Only remove the protective caps from the sockets
that are being used.

7.1 Electric servomotor (optional)

To connect the servomotor to the power supply, see the
installation and operating instructions for the servomotor.

7.2 Electronic preselection counter (optional)

To connect the preselection counter to the power supply, see the
installation and operating instructions for the counter.

7.3 Electrically heated dosing head (optional)

2e
Fig. 23 Electrically heated dosing head
Pos. Component
2e Dosing head, electrically heated
= 3 bar.
max.
= 100 °C.
max.
• To connect the temperature controller to the power supply, see
the installation and operating instructions for the electric
temperature controller.
2e1
2e2
2e3
Fig. 24 Temperature controller
Pos. Connections
2e1 Sensor
2e2 Heating
2e3 Power supply

7.4 Diaphragm controller (optional)

Warning
Explosion-proof pumps with diaphragm leakage
detection are fitted with a contact pressure gauge in
explosion-proof version.
The pressure gauge must be earthed.
Connecting the earth cable (4u), see fig. 25.
S
5s
4u
U
5u
T
Fig. 25 Diaphragm controller
Pos. Components
S Contact pressure gauge
5s Union nut
6s Contact output
T Ball non-return valve
U Connection piece
2u Deaeration screw
3u O-rings
4u Connection for earth cable
5u Union nut
or locking unit (instead of contact pressure gauge and
2)
its connection)
6s
3u
2)
2u
3u
25