Teledyne ULTRAFLOW 150, Руководство по эксплуатации, Страница: 81 / 162

SECTION 8.0, SYSTEM CALIBRATION AND ADJUSTMENT
Temperature Calibration Properties:

R-factor 1 (R1)

Speed of Sound 1 C
S
1)

R-factor 2 (R2)

Speed of Sound 2 (C
S
2)

R-factor 3 (R3)

Speed of Sound 3 (C
S
3)
Table 8-3
Temperature Calibration Properties
2.28E-04
2.30E-04
2.32E-04
2.34E-04
2.36E-04
2.38E-04
2.40E-04
2.42E-04
2.44E-04
2.46E-04
1100 1150 1200 1250 1300
Cs, Speed of Sound, ft/sec
R
F
act
o
r
R1
R2
R3
Cs1
Cs2
Cs3
The Ultraflow 150 measures temperature via time of flight of sound
(Internal Medium Temperature) or by use of an external temperature
sensor. The Internal Medium Temperature measurement is affected by the
molecular weight and heat capacity of the medium.
When these medium properties are function of the speed of sound (typical
of single fuel stack gases from combustion processes), it is possible to
adjust the temperature calibration with a Look Up Table (LUT) correction.
The above figure demonstrates the relationship between R Factor and
speed of sound (Cs) for the LUT.
Three breakpoints are provided: (1) R1, Cs1; (2) R2, Cs2; and (3) R3, Cs3.
Typically R1 is set for ambient air medium properties and Cs1 is set to the
value of speed of sound at some point above typical room temperature
values.
In utility boiler applications, the upper two points are set for the medium
properties (R2, R3) and speeds of sound (Cs2, Cs3) at mid and high loads.
R2, Cs2 is typically set at mid load and R3, Cs3 at high load. Breakpoint
(2) Cs2, R2 can be disabled by entering “-1” in Cs2. Breakpoints (1) and
8-5