Operation & Installation Manual V12-V6 2010-05-31.doc
31/05/2010
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Figure 2-7: sensor & connector assembly
The transducers are designed to meet the requirements for explosion safety according the
European standards
EN 60079-18 Encapsulated “ma”
EN 60079-1 Flameproof “d”
and are marked accordingly as
Ex II 2 G Ex d ma IIC T5
The transducers are approved by KEMA with certificate number
KEMA 07ATEX0181 X
Regarding temperature, the transducers are predominantly exposed to the temperature of
the flowing medium (gas). The transducers are designed and approved for a temperature
range of -40 C up to +50 C (+70 C pending, type G5) and -40 C up to +100 C (type G6)
2.3.2. ALTOSONIC V12 Meter body
The meter body of the ALTOSONIC V12 can be designed and manufactured according to
either one of two different concepts, depending of the nominal diameter.
For smaller meters (typically smaller than 12 inch diameter – but not limiting) the meter body
is manufactured from a single piece of metal. This piece of metal is machined to a conduit for
the gas flow. Holes are machined to accommodate the transducers. Covers are bolted on
top and on both sides of the meter body to protect the transducers and the wiring of the
transducers. The covers can be disassembled to give access to the transducers for
inspection, service or repair work.
Figure 2-8 show a meter body according to this first concept (covers and electronics
enclosure partly “cut away”, cabling not shown).
Larger meters (typically larger than 12 inch – but not limiting) are manufactured using a piece
of pipe and flanges that are welded together. “Nozzles” are welded onto the pipe to
accommodate the transducers. To protect the transducers and wiring, a case is welded
around the area where the nozzles are located. This case may have bolted covers that can
be disassembled to give access to the transducers for inspection, service or repair work.
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