Eng
lish (US)
12
8.4 WIO (water-in-oil) sensor
The WIO sensor measures the water content in the oil chamber
and converts the value into an analog current signal. The two
sensor leads are for power supply and for carrying the signal to
the measuring device or controller. The sensor measures the
water content from 0 to 20 %. It also sends a signal if the water
content is outside the normal range (warning), or if oil level is low
(alarm). The sensor is fitted in a stainless steel tube for
mechanical protection.
The WIO sensor can be used together with Grundfos IO 113 or
SM 113, but it can also be used together with other controllers
with 4-20 mA inputs.
Together with IO 113, the WIO sensor filters the signal and
provides an easy readout of the actual value. Furthermore, it is
possible to set a user-defined warning limit and calibrate the
IO 113 and the sensor to the motor oil.
The WIO sensor works in the following way:
Sensor signals
Technical data
8.5 Pump vibration sensor (PVS 3)
The PVS 3 sensor monitors the vibration level of the pump in
order to protect the pump and the pipe system against damage.
A change in the vibration level is an indication of an abnormal
situation. The reason for this can be a clogged impeller, worn
bearings, a closed discharge valve etc., indicating that a service
inspection should be carried out before the pump or the pipe
system is damaged.
9. Monitoring and control of pump
9.1 IO 113
IO 113 forms the interface between a Grundfos stormwater or
wastewater pump with analog and digital sensors and the pump
controller. The most important sensor data are indicated on the
front panel. See also the installation and operating instructions for
IO 113 (Publication no. 98097396).
One pump can be connected to an IO 113.
Together with the sensors, IO 113 forms a galvanic separation
between the motor voltage in the pump and the controller
connected.
IO 113 with SM 113 enables the following functions:
• protecting the pump against overtemperature
• monitoring the sensors for analog measurement of:
– motor temperature
– pump vibrations
– leakages (WIO)
– stator insulation resistance
– bearing temperature
– digital measurement of moisture in motor
• stopping the pump in case of alarm
• remotely monitoring the pump via RS485 communication
(Modbus or GENIbus).
Measurement of insulation resistance
IO 113 measures the insulation resistance between a stator
winding and ground (earth):
• Resistance above 10 M
Ω
= ok
• Resistance between 10 M
Ω
and 1 M
Ω
= warning
• Resistance below 1 M
Ω
= alarm.
9.2 SM 113
SM 113 is used for collecting and transferring sensor data.
SM 113 works together with the IO 113 through power line
communication using the Grundfos GENIbus protocol.
SM 113 module can be placed either inside the pump terminal
box (allowing fewer sensor leads out of the pump) or in the
control cabinet next to the pump installation. For electrical
connection see fig. 5-8. SM 113 collects data from the following
devices:
• 3 current sensors, 4-20 mA
• 3 Pt 100 thermal sensors
• 1 PTC thermal sensor
• 1 digital input.
Caution
Lack of oil may cause overheating and damage of
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.
Note
Note
The sensor signal is only valid when oil and
water is mixed (when the pump is running).
4-20 mA =
0-20 % water in oil
Accuracy better than 2 %
22 mA
=
Warning:
Water content above 20 %
3.5 mA
=
Alarm:
Air in the oil chamber
Input voltage:
12-24 VDC
Output current:
3.4 - 22 mA
Power input:
0.6 W
Ambient temperature:
32 to 158 °F (0 to 70 °C)
