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20 Micro Motion
®
ELITE
®
Sensors
Grounding
Step 5 Grounding
The sensor can be grounded via the piping if the joints in the pipeline are ground-bonded. If the sensor is not
grounded via the piping, connect a ground wire to the internal or external grounding screw, which is located
on the transmitter, core processor, or junction box.
Improper grounding can cause measurement error. Ground the flowmeter to earth, or follow ground
network requirements for the facility.
If national standards are not in effect, follow these guidelines to ground the sensor:
• Use copper wire, 14 AWG (2,0 mm²) or larger wire size for grounding.
• Keep all ground leads as short as possible, less than 1 ohm impedance.
• Connect ground leads directly to earth, or follow plant standards.
Pressure Ratings
Table 4 shows the pressure ratings for ELITE sensors.
1. Pressure rating limited by flange (for 304 sensor tubes).
2. Pressure rating limited by flange (for 316 sensor tubes).
3. Pressure rating limited by flange (for C-22 Alloy sensor tubes).
Table 4 ELITE pressure ratings
EN-1092 flange Pressure rating (bar)
Note
PN Type Facing Description ASTM
material
≤
50°C 100°C 150°C 200°C 250°C 300°C 350°C 400°C 427°C
40 11
weld
neck
B1 Flange, EN
1092-1 PN40
Form B1 (304)
304
40.0 34.4 30.8 28.0 26.0 24.1 23.0 22.0 21.4 1
40 11
weld
neck
B2 & D Flange, EN
1092-1 PN40
Form B2 & D
(316)
316
40.0 40.0 36.3 33.7 31.8 29.7 28.5 27.4 26.9 2
100 11
weld
neck
B2 & D Flange, EN
1092-1 PN100
Form B2 & D
(316)
316
100.0 100.0 90.9 84.2 79.5 74.2 71.4 68.5 67.3 2
40 32/02
lap
joint
B1 Flange, EN
1092-1 PN40
Form B1(lap
joint)
C-22 collar/
304 flange
40.0 34.4 30.8 28.0 26.0 24.1 23.0 22.0 21.4 3