Water-In-Oil (Wio) Sensor; Wio Built-In Version; Wio As Accessory; Fitting The Wio Sensor - Grundfos S1 Instrucciones De Instalación Y Funcionamiento

7. Water-in-oil (WIO) sensor

7.1 WIO built-in version

Explosion proof pumps range 58-70 have a built-in WIO sensor in
the pump housing. The sensor measures the water content in the
oil chamber.
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.
A WIO sensor is not available for range 50 and 54 explosion proof
pumps.
For more information about the WIO sensor, see 7.2 WIO as
accessory.

7.2 WIO as accessory

Warning
Lack of the lubricant may cause overheating and
damage of the mechanical seals. The WIO sensor
in the oil chamber trips the alarm if the oil quality
is poor or there is no oil in the oil chamber.
The WIO sensor is available as an accessory for pumps with
motor sizes of 7.5 to 210 hp (5.5 to 160 kW).
The sensor measures the water content in the oil chamber.
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.
The WIO sensor is not FM-approved as an
Note
Note
accessory. It is FM-approved as a built-in sensor
for frames 58-70 only.

7.3 Fitting the WIO sensor

The WIO sensor is to be fitted in the filling hole of the oil chamber
instead of the oil screw.
1. Remove the oil screw.
2. Push the sensor into the oil filling hole.
3. Push the sensor to a suitable depth in the oil chamber without
letting it touch the rotating parts, but so deep that the sensor
is completely covered by the oil. Recommended insertion
depths for different pump types appear from the table below.
4. Screw the sensor bush into the thread for the oil screw.
Vertical installation: Always use the lowest oil
screw hole.
Note
Note
Horizontal installation: Always use the inspection
screw hole.
Before refitting the WIO sensor after oil change,
Caution
clean it with white spirit.
L
Fig. 12 Dimensions of WIO sensor
S pumps, range
50
54
58
62
66
70
For more detailed information, see installation instruction for the
WIO sensor (96591899).

7.4 Electrical data, WIO sensor

Input voltage: 12-24 VDC
Output current: 3.4 - 22 mA
Power consumption: 0.6 W
Ambient temperature: 32 to 158 °F (0 to 70 °C)

7.5 Sensor signals

0-20 % water in the oil:
4-20 mA =
Accuracy better than 2 %.
Warning:
22 mA =
Water content far outside measuring range.
Alarm:
3.5 mA =
Air in the oil chamber.
The sensor signal is only valid when oil and
Note
Note
water is mixed (when the pump is running).
Insertion depths
L [inch (mm)]
3.15 (80)
3.54 (90)
3.94 (100)
3.94 (100)
3.94 (100)
3.94 (100)
15