Rosemount 8800D Series User Manual

Reference Manual
00809-0100-4003, Rev BA
August 2010
Rosemount 8800D
C-6
EXAMPLES The following examples illustrate the flowrate calculations that may be
necessary for your application. There are water, saturated steam, and natural
gas applications represented in the examples. The first set of three examples
is in English units. The second set of three examples is in SI units.
English Units Example 1 (English units)
Fluid = Water URV= 500 gpm
Line size = 3 in. LRV= 0 gpm
Line pressure= 100 psig C
2
= 1.66667E-02 (from
Table C-1 on page C-5)
Vortex Frequency = 75 Hz
K-factor (compensated) = 10.79 (via Field Communicator or AMS)
= 75.00/(10.79  0.0166667)
= 417.1 gpm
Therefore, an input frequency of 75.00 Hz represents a flow rate of
417.1 gpm in this application.
For a given input frequency, you may also determine the current output. Use
the above example with an input frequency of 75.00 Hz:
URV= 500 gpm LRV= 0 gpm F
in
= 75.00 Hz
= 17.35 mA
Therefore, an input frequency of 75.00 Hz represents a current output of
17.35 mA.
QFHzKC
2
=
I
FHzK
 C
2
LRV–
URV LRV–
--------------------------------------------------------------
16



4+=
I
75.00 10.79 0.0166667 0–
500 0–
-----------------------------------------------------------------------------------
16



4+=

Rosemount 8800D Series Specifications

General

Type	Vortex Flow Meter
Measurement Principle	Vortex Shedding
Operating Temperature	-40 to 185°F (-40 to 85°C)
Storage Temperature	-40 to 185°F (-40 to 85°C)
Communication Protocols	FOUNDATION Fieldbus
Material	316 stainless steel
Fluid Type	Liquid, Gas, Steam
Line Size	1/2 to 8 inches (15 to 200 mm)
Approvals	ATEX, IECEx, CSA, FM
Output Signal	4-20 mA
Process Connection	Flanged, Wafer, Threaded
Electrical Connection	M20
Protection Rating	IP66
Mounting Style	Wafer, Flanged