Siemens 7ME3510, Руководство по эксплуатации, Страница: 20 / 214

Description
3.3 Theory of Operation
FUP1010 IP67 Portable
18
Operating Instructions, 03/2012, A5E02951522-02
a) ρ
60
= (141.5 *999.012) / (131.5 + API60)
● where:ρ
60
= density at 60
o
F (Kg/m
3
)
b) α
60
= K
O
/ ρ
602
+ K
1
/ ρ
60
● where K
0
and K
1
are coefficients of thermal expansion.
c) ρ
t
=ρ
60
* EXP (- α
60
Δt (1 + 0.8 α
60
Δt))
● where Δt = (t - 60)
o
F and t = measured temperature
d) Therefore the volume correction factor (VCF) = ρ
t
/ ρ
60
The final volume compensated flow rate is then: Std Flow = FLOW
BULK
* VCF
Flow meter Types
The flow meter automatically conditions Installation Menu choices to suit the selected meter
type. The following illustrates the 2-Channel and 2-Path flow meter types.
2-Channel
Dual Channel provides two independent measurement channels that operate
simultaneously. Depending on the specific model, Dual Channel supports: Clamp-on Transit-
time, In-line Transit-time and Reflexor.
① ⑤
Upstream Sensors Pipe B Output Flow
②
Downstream Sensors
⑥
Channel 2 for Pipe B
③
Channel 1 for Pipe A
⑦
Pipe B
④
Pipe A Output Flow
⑧
Pipe A