8
©
Dinel, s.r.o. ULM–70
Electrical connection must be done in de-energized state!
With regard to possible occurrence of electrostatic charge on non-conductive parts of
the level meter for explosive areas (ULM–70Xi–_ _–I), level meters must be grounded with
ground terminal! It will be done using a screw placed on the head of the level meter under
the cable bushing.
The voltage source should be preferably realized as a stabilized power supply unit with safe voltage from
18 to 36 V DC (18
÷
30 V DC for Xi version), which can be a part of the evaluation or display device.
In case of strong electromagnetic interferences (EMI), parallel cable ducting with power lines, or when
cable length exceeds 30 m we recommended to use shielded cable.
6 .
e
lecTrical
connecTion
The ultrasonic level meter is designed to be connected to supply unit or to controller through
a cable with the outer diameter of 6 ÷ 8 mm (recommended cross-section of cores 0.5 ÷ 0.75
mm
2
) by means of bolted clips placed under display module. Connect the plus pole (+U) to the
terminal (+), the minus pole to 0 V to the terminal
(-) and the shielding to the terminal ( ) (only for
shielded cables).
Procedure to connect the cable to the level
meter:
1.
Unscrew the nut of the upper transparent lid.
2. Take the upper edge of the display module
and take it out carefully by mild swinging up.
3.
If you cannot grasp the module, you can use
a small screwdriver. Insert it as far as the
seam and use from several sides to slightly
lift the module.
4.
Release the cable bushing and thread the
stripped supply cable in.
5.
Connect the cable into the bolted clips ac-
cording to the diagram in Fig. 14.
6. Assemble the level meter and connect the
cable to the sequential unit.
Fig. 14: Connection diagram of the level meter
Fig. 15: Internal view of terminal block
Display unit connector
Terminal block
Metal clip
