Float switches used in
potentially explosive en-
vironments must be ap-
proved for this applica-
tion. They must be
connected to the Grund-
fos LC 231 or LC 241
level controller by an in-
trinsically safe barrier to
ensure a safe circuit. In
potentially explosive en-
vironments, the anti-
seizing function must be
disabled on the pump
controllers.
Thermal switch, PT1000 and thermistor (PTC)
Explosion-proof pumps
The thermal protection
of explosion-proof
pumps must not restart
the pump automatically.
This ensures protection
against overtemperature
in potentially explosive
environments. In pumps
with sensor, this can be
done by removing the
short circuit between ter-
minals R1 and R2 in the
IO 113.
See electrical data in the IO 113 installation and
operating instructions.
Do not install the sepa-
rate motor-protective cir-
cuit breaker or control
box installed in potential-
ly explosive environ-
ments.
WIO sensor
The WIO sensor measures the water content in the
oil and converts the value into an analog current
signal. The two sensor conductors are for power
supply as well as for carrying the signal to the IO 113.
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 there is air in
the oil chamber (alarm).
The IO 113 module must
be configured to stop ex-
plosion-proof pumps in
case the WIO sensor
sends an alarm signal.
The pump must not re-
start automatically.
The sensor is fitted in a stainless steel tube for
mechanical protection.
3
2
1
59
12
TM031
164
20
English (GB)
Summary of Contents for SE1 100
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