Emerson CMF200A installation manual Grounding, Pressure Ratings, Elite pressure ratings

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.

Table 4 ELITE pressure ratings

		EN-1092 flange						Pressure rating (bar)
																Note
PN	Type	Facing	Description	ASTM	≤50°C	100°C	150°C		200°C	250°C	300°C	350°C		400°C	427°C
				material
40	11	B1	Flange, EN	304	40.0	34.4	30.8		28.0	26.0	24.1		23.0	22.0	21.4	1
	weld		1092-1 PN40
	neck		Form B1 (304)
40	11	B2 & D	Flange, EN	316	40.0	40.0	36.3		33.7	31.8	29.7		28.5	27.4	26.9	2
	weld		1092-1 PN40
	neck		Form B2 & D
			(316)
100	11	B2 & D	Flange, EN	316	100.0	100.0	90.9		84.2	79.5	74.2		71.4	68.5	67.3	2
	weld		1092-1 PN100
	neck		Form B2 & D
			(316)
40	32/02	B1	Flange, EN	C-22 collar/	40.0	34.4	30.8		28.0	26.0	24.1		23.0	22.0	21.4	3
	lap		1092-1 PN40	304 flange
	joint		Form B1(lap
			joint)

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).

20 Micro Motion® ELITE® Sensors