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8.2.2 Gas flow sensor
There are two types of gas flow sensors, namely the GFS 700 F-EEx (standard version) and the GFS 700 F/HT-
EEx (high-temperature version). The GFS 700 F/…-EEx gas flow sensors are in conformance with the European
Directive 94/9 EG (ATEX 100a) and approved by KEMA according to the European Standards EN 50xxx under
the following number.
KEMA 00 ATEX 2119 X
The GFS 700 F/…-EEx gas flow sensors have type of protection flameproof enclosure "d" according to EN 50018
(measuring sensors) and increased safety "e" according to EN 50019 (junction box). Both types of gas flow
sensors are designed for ambient temperatures (i.e. T
a
) in the range of -40°C to +60°C. The maximum
permissible temperature of the gas(es) to be measured is restricted by the temperature class of the explosive
atmosphere that (possibly) surrounds the gas flow sensor, see therefore Table 1 and 2 below.
Temperature class
Maximum gas temperature at Ta
≤
60°C
T6 80°C
T5 95°C
T4 130°C
T3 180°C
Table 1: Temperature classification of GFS 700 F-EEx (standard).
Temperature class
Maximum gas temperature at Ta
≤
60°C
T6 80°C
T5 95°C
T4 130°C
T3 195°C
T2 290°C
T1 440°C
Table 2: Temperature classification of GFS 700 F-EEx (standard).
The GFS 700 F-EEx gas flow sensor is marked with the code
II 2G EEx de IIC T6…T3
, the high-temperature
version GFS 700 F/HT-EEx bears code
II 2G EEx de IIC T6…T1
. See also the respective Certificate of
Conformity in section 5.1 of these additional instructions.
8.2.3 Gas flow converter
The GFC 700 F-EEx gas flow converter also conforms to the European Directive 94/9 EG (ATEX 100a) and is
approved by KEMA in accordance with the European Standards of the EN 50xxx series. The GFC 700 F-EEx has
the following approval number.
KEMA 00 ATEX 2118 X
The GFC 700 F-EEx ultrasonic gas flow converter has type of protection flameproof enclosure "d" to EN 50018
(electronics compartment and
optional
for terminal compartment) and/or increased safety "e" according to EN
50019 (
standard
for terminal compartment). The flow converter is suitable for ambient temperatures in the range
of -40 to +60°C and is marked with temperature classification T6, because a maximum surface temperature of
80°C (85°C minus 5 K safety margin) is not exceeded.
The GFC 700 F-EEx is marked with code
II 2G EEx d IIC T6
for the terminal compartment in type of protection "d"
or with code
II 2G EEx de IIC T6
(terminal compartment in "e"). The Certificate of Conformity is listed in section
5.2 of these additional instructions.
Summary of Contents for GFM 700 F
Page 31: ...31 9 ATEX approvals 9 1 GFC 700 F EEx Signal converter...
Page 32: ...32...
Page 33: ...33...
Page 34: ...34 9 2 GFS 700 F EEx Primary head flowmeter...
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