Rosemount Model 8800C Vortex Flowmeter
A-8
Vibration Effect
An output with no process flow may be detected if sufficiently high
vibration is present.
The meter design will minimize this effect, and the factory settings for
signal processing are selected to eliminate these errors for most
applications.
If an output error at zero flow is still detected, it can be eliminated by
adjusting the low flow cutoff, trigger level, or low-pass filter.
As the process begins to flow through the meter, most vibration effects
are quickly overcome by the flow signal. At or near the minimum liquid
flow rate in a normal pipe mounted installation, the maximum
vibration should be 0.087-inch (2,21 mm) double amplitude
displacement or 1 g acceleration, whichever is smaller. At or near the
minimum gas flow rate in a normal pipe mounted installation, the
maximum vibration should be 0.043-inch (1,09 mm) double amplitude
displacement or
1
/2 g acceleration, whichever is smaller.
Mounting Position Effect
Meter will meet accuracy specifications when mounted in horizontal,
vertical, or inclined pipelines.
EMI/RFI Effect
Output error less than ±0.025% of span with twisted pair from 80-1000
MHz for radiated field strength of 10 V/m and from 0.15-80 MHz for
conducted RF of 3V (tested per EN61326).
Magnetic-Field Interference
Output error less than ±0.025% of span at 30 A/m (rms); meets IEC
770-1984, Section 6.2.9.
Series Mode Noise Rejection
Output error less than ±0.025% of span at 1 V rms, 60 Hz; meets IEC
770-1984, Section 6.2.4.2.
Common Mode Noise Rejection
Output error less than ±0.025% of span at 30 V rms, 60 Hz; meets IEC
770-1984, Section 6.2.4.1.
Power Supply Effect
Less than 0.005% of span per volt
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