Emerson Rosemount 8600 Series - Page 97

89
Rosemount 8600 Vortex Flow Meter
Reference Manual
May 2019
Specifications and Reference Data
00809-0100-4860, Rev BF
Optional LCD indicator
The optional LCD indicator is capable of displaying:
 Primary Variable
 Velocity Flow
 Volumetric Flow
 Mass Flow
 Percent of Range
 Analog Output
 Totalizer
 Shedding Frequency
 Pulse Output Frequency (if applicable)
 Electronics Temperature
 Process Temperature (MTA Option Only)
 Calculated Process Density (MTA Option Only)
If more than one item is selected, the display will scroll
through all items selected.
Enclosure rating
FM Type 4X; IP66
Permanent pressure loss
The approximate permanent pressure loss (PPL) from the
Rosemount 8600D flowmeter is calculated for each
application in the Vortex sizing software available from
your local Rosemount representative. The PPL is
determined using the equation:
where:
Minimum upstream pressure (Liquids)
Flow metering conditions that would allow cavitation, the
release of vapor from a liquid, should be avoided. This flow
condition can be avoided by remaining within the proper
flow range of the meter and by following appropriate
system design.
For some liquid applications, incorporation of a back
pressure valve should be considered. To prevent cavitation,
the minimum upstream pressure should be:
Failure mode alarm
HART analog
If self-diagnostics detect a gross flowmeter failure, the
analog signal will be driven to the values below:
High or low alarm signal is user-selectable through the
fail mode alarm jumper on the electronics.
NAMUR-compliant alarm limits are available through
the C4 or CN Option. Alarm type is field configurable
also.
Saturation output values
When the operating flow is outside the range points, the
analog output continues to track the operating flow until
reaching the saturation value listed below; the output does
not exceed the listed saturation value regardless of the
operating flow. The NAMUR-Compliant Saturation Values
are available through the C4 or CN option. Saturation type
is field configurable.
PPL = Permanent Pressure loss (psi or kPa)
Where:
r
f
= Density at operating conditions (lb/ft
3
or kg/m
3
)
Q = Actual volumetric flow rate (Gas = ft
3
/min or m
3
/hr;
Liquid = gal/min or l/min)
D = Flowmeter bore diameter (in. or mm)
A = Constant depending on meter style, fluid type and
flow units. Determined per following table:
PPL
A

f
 Q
2

D
4
------------------------------=
Table A-4. Determining the PPL
Meter
Style
English Units SI Units
A
Liquid
A
Gas
A
Liquid
A
Gas
8600DF 3.4 ? 10
-5
1.9 ? 10
-3
0.425 118
P = 2.9P + 1.3p
v
or P = 2.9P + p
v
+ 0.5 psia (3.45
kPa) (use the smaller of the two results)
P = Line pressure five pipe diameters downstream of the
meter (psia or kPa abs)
P = Pressure loss across the meter (psi or kPa)
p
v
= Liquid vapor pressure at operating conditions (psia or
kPa abs)
Low 3.75
High 21.75
NAMUR Low 3.60
NAMUR High 22.6
Low 3.9
High 20.8
NAMUR Low 3.8
NAMUR High 20.5