Rosemount Model 8800C Vortex Flowmeter
A-2
The Reynolds number equation shown below combines the effects of
density (), viscosity (
cp
), pipe inside diameter (D), and flow rate (V).
Process Temperature Limits
Standard
–40 to 450 °F (–40 to 232 °C)
Extended
–330 to 800 °F (–200 to 427 °C)
Output Signals
4–20 mA Digital HART Signal
Superimposed on 4–20 mA signal
Optional Scalable Pulse Output
0 to 10000 Hz; transistor switch closure with adjustable scaling via
HART communications; capable of switching up to 30 V dc,
120 mA maximum
Analog Output Adjustment
Engineering units and lower and upper range values are user-selected.
Output is automatically scaled to provide 4 mA at the selected lower
range value, 20 mA at the selected upper range value. No frequency
input is required to adjust the range values.
Table A-1. Minimum Measurable Reynolds Numbers
Line Sizes (Inches / DN) Reynolds Number Limitations
1
/2 through 4 / 15 through 100 10000 minimum
6 through 12/ 150 through 300 20000 minimum
Table A-2. Minimum Measurable Velocities (Use the Larger of the Two Values)
Feet per Second Meters per Second
Liquids
(1)
(1) The minimum measurable velocity for the 10in. line size is 0.9 ft/s
(.27m/s) and 1.1 ft/s (.34m/s) for the 12in. line size.
Gases
The
r
is the process fluid density at flowing conditions in lb/ft
3
for ft/s and kg/m
3
for m/s
Table A-3. Maximum Measurable Velocities (Use the Smaller of the Two Values)
Feet per Second Meters per Second
Liquids
Gases
(1)
(1) Accuracy limitations for gas and steam for Dual-style meters (all sizes):
max velocity of 100 ft/s (30.5 m/s).
The
r
is the process fluid density at flowing conditions in lb/ft
3
for ft/s and kg/m
3
for m/s
5
'
9'
r
P
F
r
36/
r
or 0.7
54/
r
or 0.22
36/
r
or 6.5
54/
r
or 2.0
90,000/
r
or 25
134,000/
r
or 7.6
90,000/
r
or 25
134,000/
r
or 76
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