Level Sensor; Non-Return Valve - Grundfos Multilift MSS Montage- Und Betriebsanleitung

Nameplate, pump
The nameplate is printed on the pump.
Fig. 3 Nameplate, pump
Pos. Description
1 Type designation
2 Product number
3 Rated voltage
4 Frequency
5 Rated current
6 Rated speed
7 Rated power input
8 Weight
9 Maximum flow rate
10 Maximum head
11 Approvals
12 Production week, year and day
13 Maximum liquid temperature
14 Maximum installation depth
15 Power factor
16 Insulation class
17 Enclosure class

5.1.3 Non-return valve

The DN 80 non-return valve includes a drain screw to lift up the
internal flap in order to drain the discharge pipe in case of
maintenance or service. The valve is designed and tested
according to EN 12050-4. See fig. 4.
Loosen the lock nut a little before turning the
Note
drain screw.
Drain screw
Fig. 4 Non-return valve

5.1.4 Level sensor

The piezoresistive pressure sensor placed in the controller is
connected via a hose to a pressure tube in the tank. The screw
cap where the hose is connected includes a condensate trap and
a connection for a DN 100 tube. This tube, the pressure tube,
extends down into the tank. The rising liquid level compresses the
air inside the pressure tube and hose, and the piezoresistive
sensor transforms the changing pressure into an analogue signal.
The control box uses the analogue signal to start and stop the
pump and to indicate high water-level alarm. The pressure tube is
fixed underneath the screw cap and can be taken out for
maintenance, service and for cleaning the inside of the tube. An
O-ring ensures tightness.
The hose is supplied in lengths of 4 or 10 m. The hose must be
connected to the controller.
Fig. 5 Screw cap with hose, DN 100 tube and condensate
trap
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