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Electrical Power Lines
For the installation of the electrical lines of the system,
please follow the indications provided for in "Dosaodor-D
Electric System Design" available on request and provisions
below:
•
It is required to install two cable protection pipes, one
connecting the terminal black box with the control
unit, and the other connecting the junction box for the
injected volume control device with the control unit. This
procedure is essential, as the cables that they protect
are classified under different typologies of electrical
protection. More specifically, the cable path for the
connection of the terminal black box contains cables
that are part of an EExe-certified circuit, whereas the
path for the connection of the injected volume control
device contains cables that are part of an EExi-certified
circuit and thus they cannot be present in the same
cable path.
•
The use of a spiral sheathing in plastic material suitable
for protecting the passage of the connection cables,
is sufficient for the connection of the explosion-proof
valves in the system. This solution has been made
possible due to the special EExd certified sealing
couplings, adapted to the creation of EExe circuits, and
have been used on the inlet side of the valves.
•
All metal structures installed must be grounded. The
pneumatic panel and electronic control unit must be
connected to the grounding system of the station using
a yellow/green wire of at least 4 mm
•
Be especially careful in ensuring that the passage
of the cable paths from the "Hazardous area" to the
"Safe area" is carried out properly. For this purpose, it
is advisable to use a "Y"-sealing coupling (stop joints)
mounted on a metal tubing stub, which must be long
enough to ensure that it completely crosses through
the wall dividing the rooms. It must also be "walled"
using cement and in a way that ensures the separation
of air between the rooms. When the cable connections
have been completed, the coupling must be filled with a
specific resin used for such purposes in order to ensure
that it is perfectly sealed.
•
A sleeve and/or spiral sheathing in plastic material can
be used to protect cables for the transferal of signals
between the flow computer and the electronic control
unit, as long as this installation is carried out insuring a
tightness equal to at least IP 44.
Electrical Connections
Regarding the electrical connections see figures 7 and 8,
that represent clearly the connection of the individual wires.
2
.
Pneumatic Lines
The pneumatic connections between the Dosador-D panel,
the gas line, and the odorant tank should be carried out
using stainless steel piping only, with diameters of 8x6 and
6x4 mm, respectively.
During installation operations, be especially
careful that the the odorant‑pickup tank base
is installed at least 40 cm (16 in) higher than
the odorant entry point of the Dosaodor‑D
panel. This ensures that the control device
fills up.
WARNING
!
The pipeline connecting the Dosaodor‑D panel
with the odorant tank should not be installed
in a manner permitting the creation of any air/
gas pockets. Therefore, it is recommended to
have it installed completely straight and with
a grade that is as constant as possible with no
sequences of upward and downward inclines.
Pneumatic Connections
Teflon tape or pipe sealing compound for threads should
be used on all connector pipe fittings to prevent odorant
leakage.
It is advisable to use a drainage valve, if present, on the
bottom of the absorption-type odorization tank, to collect any
liquid from the tank itself. If a drainage valve is not present, it
is possible to make the connection with the lower opening on
the level indicator (drainage).
Refer to the explanatory drawings on the following pages for
carrying out these connections.
Be careful with the type of system you are working
on, connections are different depending on the type of
measurement used in the reduction system (VOLUMETRIC/
VENTURIMETRIC measure).
The first drawings represent a typical reduction and
measurement system equipped with only one tank for
absorption-type odorization.
The subsequent drawings show a reduction and
measurement system equipped with a storage tank,
absorption-type tank, and systems with suction tank only,
without absorption-type odorization.
Dosaodor-D
CAUTION
15
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