Tecfluid COVOL Series - Manual (Page 16)

16
9 ADDITIONAL INSTRUCTIONS FOR THE ATEX VERSION
This chapter only applies to equipment intended for use in explosive atmospheres.
9.1 Intrinsic safety
The flowmeters of series COVOL, when include just the reed sensor and the connector,
can be considered simple apparatus as defined in the EN 60079-11 standard. In these
cases it can be installed in hazardous areas provided that they are connected to a zener
barrier or to an intrinsic safety isolator. Please consult factory for the recommended
models.
9.2 Flameproof enclosure
These equipment conform with the directive 94/9/CE (Equipment and protective systems
intended for use in potentially explosive atmospheres) as indicated in the EC-type
examination certificate LOM 14ATEX2006 X and its marking.
Given that this instrument belong to group II, it is intended for use in places likely to
become endangered by explosive atmospheres, but not in mines.
The category is 2GD, that is, it is intended for use in areas in which explosive
atmospheres caused by mixtures of air and gases, vapours, mists or air/dust mixtures are
likely to occur.
8 K FACTOR (PULSES / LITRE)
Measured values for water at 20 ºC
DN
Pulses / litre
± 12%
cm 3 / pulse
± 10%
10 / 1/4” (H) 100 10
10 100 10
15 20 50
25 10 100
40 4 250
50 2 500
80 1 1000
100 0,2 5000