Siemens FUS1010, Руководство по эксплуатации, Страница: 28 / 298

Description
3.4 Theory of Operation
FUS1010 IP65 NEMA 4X & IP66 NEMA 7
Operating Instructions, 01/2013, A5E02951520-AC
27
LiquIdent values (for a wide range of different liquids) can then
2. nolds # is computed. The
3. ard 2540. Note: 15.6°C
a) 60)
/m
3
)
fficients of thermal expansion.
temperature
= FLOW
BULK
* VCF
Flow Meter Types
e meter automatically conditions Installation Menu choices to suit the selected meter type.
l 1+2
e 140)
LiquIdent provides an output that identifies the liquid independent of the operating
temperature and pressure.
1.
Through optimization the
be associated with an API@ 15.6°C (60°F) as well as Viscosity @ 15.6°C (60°F). This
information can be keyed into a lookup table within the flow meter. This table then serves
as a reference for dynamically inferring the liquid properties as different liquid batches
enter the flow sensor. (The lookup function for this table will also interpolate and
extrapolate for values between and outside the table values.)
Based on FLOW
RAW
and the inferred Viscosity, the current Rey
Reynolds # value is used to correct the raw flow for non-plug flow profile. The
compensated actual flow rate is then computed (FLOW
BULK
).
The volume correction can now be computed using API stand
(60°F) is used for the base temperature value in the example below, but this can be
altered within the flow meter menu.
ρ
60
= (141.5 *999.012) / (131.5 + API
● where:ρ
60
= density at 15.6°C (60°F) (Kg
b) α
60
= K
O
/ ρ
602
+ K
1
/ ρ
60
● where K
0
and K
1
are coe
c) ρ
t
=ρ
60
* EXP (- α
60
Δt (1 + 0.8 α
60
Δt))
● where Δt = (t - 60) °F and t = measured
d) Therefore the volume correction factor (VCF) = ρ
t
/ ρ
60
The final volume compensated flow rate is then: Std Flow
Th
The following paragraphs introduce the available flow meter types that include:
●
2-Channel
● 4-Channel
● 2-Path
● 4-Path
● Channe
● Channel 1-2
● Reflexor (Pag