Wio Sensor; Servicing And Maintaining The Product; Safety Instructions And Requirements - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

8.5 WIO sensor

In case of overheating caused by wear, lack of
lubricant etc., the Pt100 sensors will trip an alarm
FM
and cut off the power supply at a preset temperature.
The maximum acceptable alarm temperature can be
seen in the table above.
Lack of oil may cause overheating and damage to
the mechanical shaft seals. The WIO sensor in the oil
chamber will trip the alarm if the oil quality is poor or
there is not enough oil in the oil chamber.
Do not use Shell Ondina X420 oil in pump fitted with
WIO sensor.
The oil chamber is filled with oil acting as lubricant and coolant for
both mechanical seals. The WIO sensor measures the water
content in the oil chamber:
• 0-20 % water in the oil causes no reaction
• water content outside measuring range causes a warning
• oil level too low causes an alarm.
The sensor consists of a plate capacitor which is immersed in the
oil and measures the electronic circuit, emitting a 4-20 mA
proportional current signal.
More detailed information can be found in the installation and
operation instructions, 96591899, or in Grundfos Product Center
at www.grundfos.com.
26

9. Servicing and maintaining the product

9.1 Safety instructions and requirements

DANGER
Pump can tilt
Death or serious personal injury
- During maintenance and service, including
transportation to service workshop, always support
the pump by means of lifting chains or place it in
horizontal position to secure stability.
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make sure that
the main switch has been locked in position 0.
Make sure that the power supply cannot be
accidentally switched on.
WARNING
Crushing of hands
Death or serious personal injury
- Make sure that all rotating parts have stopped
moving.
Maintenance and service must be carried out by
specially trained people.
Maintenance and service work on explosion-proof
pumps must be carried out by Grundfos or a service
workshop authorized by Grundfos.
A cable replacement must be carried out by
Grundfos or a service workshop authorized by
Grundfos.
FM
In case of repairs, always use original service parts
from the manufacturer as this will ensure correct
dimensions of flame path gaps.
The bolts used in the motor must be class A4-80 or
A2-80 according to ISO 3506-1. VER 2.
A defective bearing may reduce the FM safety.
WARNING
Toxic material
Death or serious personal injury
- Flush the pump thoroughly with clean water before
carrying out maintenance and service. Rinse the
pump parts in water after dismantling.