Technical data

Flow Meter FC01-Ex Flow Meter FC01-Ex
4 Ex atmosphere - Definitions and mounting instructions 4 Ex atmosphere - Definitions and mounting instructions
2.4 Temperature limits
2.4.1 Gases
Maximum media temperature in zone 0 is 75°C. This value also depends on the medium used
which might limit the actually allowed temperature.
According to valid standards for use in equipment group II, category 1 (zone 0) and with
regard to avoiding potential ignition sources the temperatures of all surfaces – even
with very rare operating troubles – must not exceed 80% of the ignition temperature of
an inflammable gas, measured in °C.
Therefore the user has to take care that the temperature limits of his particular medium be
expressly stipulated in accordance with the known ignition temperature (see DIN EN 11271,
explosive atmospheres – explosion protection. Part 1, para 6.4.2: hot surfaces, category 1).
For applications in category 2 the special temperature limit must only be exceeded in rarely
occurring operating troubles.
2.4.2 Dust
The indicated temperature (T +130°C) is the surface temperature of the equipment to be taken
into account with a max. ambient temperature of +75°C in zone 20 or 21.
Therefore the user has to take care that the temperature limits be expressly stipulated by
means of the determined ignition temperature (to the method stipulated in EN 50281-2-1) of
a cloud of dust or the smouldering temperature of a dust layer of his particular medium (see
EN 50281-1-2, electrical apparatus for use in areas with inflammable dust, para 6: temperature
limitation).
2.4 Temperature limits
2.4.1 Gases
Maximum media temperature in zone 0 is 75°C. This value also depends on the medium used
which might limit the actually allowed temperature.
According to valid standards for use in equipment group II, category 1 (zone 0) and with
regard to avoiding potential ignition sources the temperatures of all surfaces – even
with very rare operating troubles – must not exceed 80% of the ignition temperature of
an inflammable gas, measured in °C.
Therefore the user has to take care that the temperature limits of his particular medium be
expressly stipulated in accordance with the known ignition temperature (see DIN EN 11271,
explosive atmospheres – explosion protection. Part 1, para 6.4.2: hot surfaces, category 1).
For applications in category 2 the special temperature limit must only be exceeded in rarely
occurring operating troubles.
2.4.2 Dust
The indicated temperature (T +130°C) is the surface temperature of the equipment to be taken
into account with a max. ambient temperature of +75°C in zone 20 or 21.
Therefore the user has to take care that the temperature limits be expressly stipulated by
means of the determined ignition temperature (to the method stipulated in EN 50281-2-1)
of a cloud of dust or the smouldering temperature of a dust layer of his particular medi-
um (see EN 50281-1-2, electrical apparatus for use in areas with inflammable dust, para 6:
temperature limitation).