Universal Flow Computer UR06
Operating Manual
Page 38 of 55
Subject to changes
A-EN-08728-URRev.B
Bopp & Reuther
Messtechnik GmbH
17.7 Orifice
17.7.1 Orifice type
Selection of the orifice (differential pressure device).
Selection:
Cross probe
Orifice D-D/2 tap
Venturi nozzle
Orifice Corner tap
ISA-nozzle
Venturi tube
Orifice flange tap
Quad edge orifice
Pitot tube
V-Cone
ILVA
17.7.2 Flow coefficient
The flow coefficient determines the measuring range for autarkon transmitters (cross probe), Pitot tube
and ILVA (Gilflo).
Range:
0.00 m3/h ... 10000.00 m3/h
17.7.3 Flow rate factor
Determined flow rate correction factor, deviation from the standard.
If the orifice is a Venturi tube, it is possible to enter the flow rate coefficient here. Characteristic line
corrections are carried out via linearization.
Range:
0.5000 ...
1.000
… 2.000
17.7.4 Bore diameter
Internal diameter of the bore
Range:
3 ... 1500 mm
17.7.5 TC pipe
Temperature coefficient of the supply pipe, e.g. tc(V2A)=16 E-6 1/K
Range:
1 ... 100 E-6 1/K
17.7.6 TC bore
Temperature coefficient of the bore.
Range:
1 ... 100 E-6 1/K
17.8 Linearization
17.8.1 Linearization
Selection of the characteristic line correction of the flow sensor or orifice.
Selection:
without
, Re polynomial, Q polynomial, Q table
The parameters are used for linearizing the flow rate characteristic line. Wet calibration has to be
carried out to determine the parameters. Linearization can occur as a function of the Reynolds number
(Re) as well as proportional to the flow rate (q). Linearization only occurs within the Reynolds number
or the flow rate thresholds determined via Q/Re-Lin 6 and 7. Outside the area, the correction occurs
with the next threshold.
2
2
1
1
0
1
1
2
2
Re
K
Re
K
K
Re
K
Re
K
f
2
2
1
1
0
1
1
2
2
q
K
q
K
K
q
K
q
K
f
)
f
1
(
q
q
L
f
= error, deviation of the characteristic line
q
L
= linearized flow rate
K
n
= polynominal coefficients, (K
-2
… K
2
= Q/Re-Lin Par 1 … Q/Re-Lin Par 5)
Range:
According to the parameter
