Page
32
/
37
ATEX Electrical Component Criteria
Electrical components are covered LCIE 03 ATEX 6230X certification which allows use in
intrinsically safe or flameproof applications.
ATEX Intrinsically Safe Data Table and Tag Example
The intrinsically safe model certification depends on whether a preamplifier is used and the
temperature range of application (Table 2).
•
without
preamplifier
II 1 G EEx ia IIC T6 to T3; ambient temperature (Ta) between -20 &
+180°C
•
with
FH71 preamplifier
II 1 G EEx ia IIC T6 to T5; ambient temperature (Ta) between -20 &
+80°C
Table 2.
ATEX mark
II
Equipment Group
Equipment for places with a potentially explosive atmosphere, other
than mines susceptible to firedamp.
1
Category
Area in which an atmosphere at risk of explosion as a mixture of air
and inflammable gases, vapors or mists is continuously or frequently
present or present for long periods.
G
Gas/Dust
Gas
Ex
Electrical device
ia
Type of protection
Intrinsically safe
II
Gas group
Surface above ground industries
C
Gas subgroup
Most easily ignited e.g. hydrogen or acetylene
T6
85°C; Ta
≤
80°C
T5
100°C; Ta
≤
95°C
T4
135°C; Ta
≤
130°C
T3
200°C; Ta
≤
180°C
Additional parameters applying to ATEX Intrinsically Safe certification
Without
preamplifier
Ui
≤
10 V Ii
≤
2 mA Ri ≥ 3,420 Ω Ci
≅
0 Li
≤
3.2 H
With
FH71 preamplifier
Ui ≤ 28 V Ii ≤ 150 mA
Pi ≤ 1 W Ci
≅
0 Li
≤
0
ATEX & IEC Ex Flameproof Data Table and Tag Example
The flameproof models are certified
II 1 G Ex d IIC T6 Gb & IECEx LCI 12.0013X. Ambient
temperature (Ta) must remain between -50 and + 60°C.
Table 3
ATEX mark
II
Equipment Group
Equipment for places with a potentially explosive atmosphere, other
than mines susceptible to fire damp.
Page
9
/
37
Flange bolts
The material of flange bolts shall be chosen in ASTM A 193 B7 (bolts) and ASTM A 194 2H
(nuts) according to ASME B16.5 standard for temperature between -45°C and +480°C.
Tightening torque
If the flowmeter is equipped with a flow straightener, the bolts must be checked and
retightened before commissioning. A label affixed to the flanges calls attention to this requirement.
Bolt size and tightening torque – non coated
Bolt size and tightening torque - coated
M
N.m
NPS
ft-lb
M
N.m
NPS
ft-lb
14
110
1/2
60
14
85
1/2
45
16
160
5/8
120
16
130
5/8
90
20
350
3/4
210
20
250
3/4
160
24
550
7/8
350
24
450
7/8
250
27
800
1
500
27
650
1
400
30
1,150
1 1/8
750
30
900
1 1/8
550
33
1,550
1 ¼
1,050
33
1,200
1 ¼
800
36
2,040
1 ⅜
1,400
36
1,600
1 ⅜
1,050
39
2,650
1 ½
1,800
39
2,050
1 ½
1,400
42
3,350
1 ⅝
2,350
42
2,550
1 ⅝
1,800
Figure 7. Recommended tightening torque for Klingersil gasket type
Condition of Liquids Measured
Flowmeter life duration and measurement reliability can be seriously impacted by the
presence of gas and/or solid particles in the flowing liquid.
The presence of gas, in the form of bubbles or emulsions, can cause serious degradation of
measurement performance. Gas "pockets" between two liquid sections can destroy the rotor
bearings, leading to serious measurement errors and/or damage to the cartridge assembly.
To ensure accurate measurement and minimize possibility of damage, FH recommends
eliminating the possibility of gas injection upstream from the measurement point and providing,
when required, a draining or degassing system upstream from the flowmeter. We recommend
positioning the flowmeter to minimize the possibility of gas pocket formation resulting from
contraction of volumes during an interruption of flow.
The presence of small-sized solid particles within the flowing liquid may result in a gradual
deterioration of the flowmeter fixed or mobile elements (bearing support cross pieces, bearing,
rotor), which can lead to a gradual deterioration of performance. Larger solids can cause significant
damage requiring replacement of these parts (bearing support cross pieces, bearing, and/or rotor).
