Channel Tabs - Panametrics Sentinel User Manual

Chapter 2. Initial Setup
2.6.1

Channel Tabs

Use this section to program the meter parameters, which requires the user to login before any parameters can be
changed.
2.6.1.1 General
Figure 37 on page lv shows a typical
• Path Length (P): This is the acoustics path length. The value is measured on the assembled meter.
• Axial Distance (L): The value of the axial distance is measured on the assembled meter or derived from Quality
Control Report measurement.
• Pipe Diameter: This is the inside diameter of the meter. This parameter is used by the meter as a factor in
volumetric calculation. The value is measured on the assembled meter or derived from Quality Control Report
measurement.
• Transducer Frequency: Select from a drop down menu the specified frequency for a pair of transducers.
• Fine/Coarse Switch Point: This is the number of points corresponding to the delta T at which the velocity
calculation will switch from Mode 2 to Mode 3.
The formula for converting from velocity to count number is:
Where,V = velocity (meters/second)
SOS = speed of sound (meters/second)
L = axial length (meters)
F = programmed transducer frequency (hertz)
Note:
The meter will be shipped with the correct count number to insure that the meter operates correctly.
• # in Avg: This is the number of parameters averaged together before being reported on average outputs. For
the critical parameters, like velocity and volumetric, it is the number of averaged measurements. This number
is carefully selected by the manufacturer to meet the meter specification as well as optimize the meter
performance.
• Time delay (Tw): The delay time is a number which includes various delays in the transducers, electronics and
cables. The manufacturer determines the exact Tw number during the zero flow calibration procedure.
• Zero cutoff: The value below which the velocity reading is forced to zero.
54
General
tab display:
Counts = V
32LF
¥ - - - - - - - - - - - - - - - - - - -
SOS ¥ SOS
Sentinel™ User's Manual