Teledyne ULTRAFLOW 150, Operation Manual, Page: 58 / 162

ULTRAFLOW 150 GAS FLOW AND TEMPERATURE MONITOR
equation applied to the actual flow velocity as derived from measured
times of flight and the Geometry Properties parameters (see System
Calibration and Adjustment, Section 8.0, for additional details). The
linearizer is helpful for correcting for stratification, nonaxial flow or other
effects. Either a polynomial (POLY) of order one to five or a three-point
Look Up Table (LUT) may be used. The Flow Correlation Curve Source
parameter selects which linearizer form is in use. Note that either the LUT
or POLY must be enabled, i.e., the linearizer cannot be bypassed.
CONTENTS: X1,Y1,X2,Y2,X3,Y3 (LUT Points)
A0,A1,A2,A3,A4,A5 (POLY Points)
Flow Corr. Curve Source (POLY or LUT)
TEMP CALIBRATION PROPERTIES: This screen contains a three-
point interpolation function meant to compensate the internal medium
temperature channel for changes in the measurement medium gas
properties. Speed of sound is used as the input or independent variable,
therefore this compensation approach is only appropriate when the gas
properties are a function of the speed of sound. “R Factors” are the desired
outputs at the three speed of sound points. “R Factors” are directly
proportional to the molecular weight of the medium and inversely
proportional to heat capacity.
CONTENTS: R1,R2,R3 (“R Factor” Points)
CS1,CS2,CS3 (Speed of Sound Points)
STD. PRESSURE PROPERTIES: This screen contains the two-point
calibration curve for the optional external pressure transducer, the pressure
to which the standardization is referenced and the parameter that enables
or disables pressure correction. The Counts parameters are analog-to-
digital converter values that correspond to the pressures at the two points.
CONTENTS: Standard Pressure Correction (ENABLE,
DISABLE) Pressure at Point
1
Counts at Point 1
Pressure at Point 2
Counts at Point 2
Reference Pressure
STD. TEMPERATURE PROPERTIES: This screen contains the two-
point calibration curve for the optional external medium temperature
transducer, the temperature to which the standardization is referenced and
the parameter that enables or disables temperature correction. The Counts
parameters are analog-to-digital converter values that correspond to the
temperatures at the two points.
CONTENTS: Standard Pressure Correction (ENABLE,
DISABLE) Temperature at
Point 1
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