SET-2000 Oil / Sludge (110 VAC) D15645AE-2
Installation and Operating Instructions
Copyright © 2019 Labkotec Oy 5/15 We reserve the right for changes without notice
2.2 Sensor installation
The sensor installation should be done as described in figure 3.
SET/DM3AL sensor gives an alarm when the upper electrode is in oil.
SET/S2 sensor gives an alarm when there is enough sand or sludge
accumulated between the two heads of the sensor. When the sludge
layer on the bottom of the separator or settling tank is pretty solid, the
correct installation depth can be adjusted based on the current level. In
case the level is not that clear, a tryout period of couple of days may be
useful.
Please check the correct installation depth also from the instructions of
the oil separator.
2.3 Junction box
If the sensor cable must be extended or there is need for equipotential
grounding, it can be done with the cable junction box. The cabling
between the SET-2000 control unit and the junction box should be done
with a shielded twisted pair instrument cable.
The cabling in figure 3 can be done with a two-pair shielded twisted pair
cable, whereupon both pairs are equipped with their own shields. Make
sure that the signal wires of the cables can never be connected to
each other.
LJB3 junction box enables cable extension in potentially explosive
atmospheres.
In figure 3 the shields and excess wires have been connected to the
same point in galvanic contact with metallic frame of the junction box.
This point can be connected to equipotential ground thru the ground
terminal. Other components of the system that need to be grounded can
also be connected to the same ground terminal.
The wire used for equipotential grounding must be min. 2.5 mm²
mechanically protected or, when not mechanically protected, the
minimum cross section is 4 mm².
Please make sure, that the sensor and the cable between SET-2000
control unit and the sensor do not exceed the maximum allowed
electrical parameters –see chapter 7 Technical data.
Detailed cabling instructions can also be found in the installation
instructions of SET/DM3AL and SET/S2 sensors.
Junction box of type LJB3 includes light alloy parts. When installing in
explosive atmosphere, make sure, that the junction box is located so,
that it can not be mechanically damaged or it will not be exposed to
external impacts, friction etc. causing ignition of sparks.
