Annex
Page
20
/
20
V
Technical data
The level sensor is connected to a 4 … 20 mA interface, which provides the auxiliary energy simult
a-
neously. The connection is via the + and
-
terminals. The sealing of the cable is given by a cable
gland
or by a conduit system. Also an M12 plug
-
in connection can be used for the interface, pin 1 (+) and
pin 3 (
-
).
P
ower supply:
U
=
8 V … 30 V
d.c.
The following safety
-
related values are defined with:
Input voltage:
U
i
≤
30 V
Input current:
I
i
≤
200
mA
Input power:
P
i
≤
1 W
The externally effective capacitance and inductance are:
Internal capacitance:
C
i
≤
5 nF
Internal inductance:
L
i
≤
30
μH
When used in potentially explosive atmospheres, the maximum temperatures depending on the
temperature classes and
categories can be found in the table.
Temperature class
T
medium
or T
probe tube
T
medium
or T
probe head
Category 1 (level sensor entirely erected in Zone 0)
T6
-
20
°C … +45 °C
T5, T4, T3, T2, T1
-
20
°C … +60 °C
Category 1/2 (probe tube erected in Zone 0, sensor head erected in Zone 1)
T6
-40 °C … +45 °C
T5
-
20
°C … +60 °C
-40 °C … +60 °C
T4, T3, T2, T1
-40 °C … +85 °C
Category 2 (level sensor entirely erected in Zone 1)
T6
-40 °C … +85 °C
-40 °C … +45 °C
T5
-40 °C … +100 °C
-40 °C … +60 °C
T4
-40 °C … +135 °C
-40 °C … +85 °C
T3
-40 °C …
+200
°C
T2
-40 °C … +300 °C
T1
-40 °C … +450 °C
If the probe tube is operated at higher liquid temperatures as listed in the table, it must be
ensured through appropriate measures that at no point of the
probe, the temperature (T
ambient
) will
be exceeded according to the relevant temperature class.
General Note:
Zone 0 is given only under atmospheric conditions (see EN
60079-
0):
Temperature range:
-
20
°C … +60 °C
Pressure range:
0.8
bar
to
1.1
bar
Oxidants:
Air (oxygen content approx. 21
%)
