Labkotec SET/DM3AL, Руководство по эксплуатации и установке

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SET/DM3AL D26052AE-2
Operation and Installation Manual
All rights reserved. Copyright © 2019, Labkotec Oy
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3. CONNECTIONS AND INSTALLATION
The SET/DM3AL sensor is equipped with a shield-
ed 2-wire cable. The numbered wires 1 and 2 of
the cable are connected to the corresponding con-
nectors (1 = +, 2 = -
) in the control unit. Unnum-
bered wire is connected to the cable shield. Always
check the connections from the installation and
operation manual of the control unit as well.
In figure 3 the connection example 1; a LJB2-78-
83 junction box has been used to connect the ca-
bling to the equipotential bonding.
In figure 3 connection examples 2 and 3; equipo-
tential bonding is not available. The shield is con-
nected to the appropriate connector in the supply
device.
In these kinds of arrangements, it must be
ensured that the electrostatic charges do not
cause a hazard. Make sure in the installation that
the device and cabling are not close to any strong
current or other installations, and that they are not
exposed to any strong stream flows, mechanical
abrasions, or impacts.
The cable may be shortened or extended with a
junction box, if necessary. The sensor may be
installed by hanging it from its cable (upper limit
alarm) or immersed in the liquid to be measured
(lower limit or interface alarms).
The example in figure 3 shows an oil separator
application in which the switch data is received
when the upper electrode is covered in oil i.e. is no
longer immersed in the conductive liquid
.
4. OPERATION
This chapter provides a general description of the
operation of the oil alarm in different situations. For
a more detailed description, please refer to the
manual of the control unit in use.
Normal
mode The SET/DM3AL oil level sensor is entire-
ly immersed in water.
The indicator lights are off.
The relays are energized.
Oil
cham-
ber full The SET/DM3AL sensor is immersed in
oil. (The sensor does not issue an alarm
before the upper electrode is covered in
oil. The alarm is issued at the latest when
the entire sensor is immersed in oil.)
The Oil chamber is full indicator lights up.
The buzzer sounds
The relays are de-energized.
(Please note. A similar alarm is issued
when the SET/ DM3AL sensor is in the
air.)
Once the alarm is off, the indicator lights
switch off, the buzzer stops, and the relays
are energized.
Fault
alarm The sensor is broken, there is a sensor
cable break or a short circuit, or the sen-
sor signal is not recognized (digital sys-
tem).
The sensor circuit’s Fault indicator is on.
The buzzer sounds.
The relays are de-energized.
Figure 3. Installation example in an oil separator.