Tecfluid TM Series - Manual (Page 14)

14
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 TM, when include just the pickup 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 14ATEX2008 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
± 10%
cm 3 / pulse
± 10%
15 730 1,28
20 500 2
25 220 4,5
40 60 16
50 20 50
65 10 100
80 5 200
100 3 333
125 1,5 666
150 0,8 1250