KROHNE ALTOSONIC V12 EN - Manual (Page 13)

DEVICE DESCRIPTION
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ALTOSONIC V12
www.krohne.com 04/2013 - 4002643502 - MA ALTOSONIC V12 R02 en
2.2.2 The electronic unit
The housing consists of three compartments. Each compartment has a removable cover that
gives access to the inside, in order to connect external wiring or to install or to replace
components.
Connection compartment
The compartment on the right side is the connection compartment, which contains only a block
with screw terminals. Signal wires from and to the electronics compartment are connected to
this terminal block. Wiring to other (external/auxiliary) equipment can be connected to the screw
terminals in this compartment.
Cables can enter this compartment through cable glands installed in either one of three
threaded holes M20x1.5.
Power supply / RS485 compartment
The compartment on the left side is used to install the power converter. This board also includes
two serial data ports (RS485). As an option an additional diagnostics processor board can be
installed. Wiring to external equipment or to a power source is attached to connectors with
screw terminals. These connectors engage directly with matching parts on the printed cicuit
boards.
Cables can enter this compartment through cable glands installed in either one of three
threaded holes M20x1.5.
DANGER!
The transducers have an Ex-d socket (socket, 3) that connects to an Ex-d plug 4 which
terminates a coaxial wire 8.
An alignment pin 5 on the connector engages with a slot in the Ex-d socket 2, this ensures that
the transducer is connected with the correct polarity. The cap 6, screwed on the Ex-d socket,
fastens the connector, a small securing screw (M2) 7 secures this cap. The transducers are
fastened in the meter body using a transducer nut with a hole in the centre 9. A double O-ring
1 seals the pressure inside the piping effectively from the outside world.
Figure 2-4: Converter housing
1 Power supply / RS485 compartment / Optional diagnostics board
2 Electronics compartment
3 Connection compartment
DANGER!
Unused holes must be closed with Ex d approved blind stops.