Step 2 - Flow Conversion (Area Velocity Only) - Teledyne 4250 Installation And Operation Manual

2.4.4 Step 2 - Flow
Conversion (Area
Velocity Only)
chloride) and sea water. If you use the value of 1.91, in most cases
you will be able to identify that gross changes are occurring in
the ionic content of the stream. If you move with the right
arrow, the following options will appear on the display:
YSI 600 CONDUCTIVITY PARAMETER
• YSI T.D.S. • • NOT MEASURED •
T.D.S. stands for "total dissolved solids." T.D.S. are measured in
parts per thousand (ppt).
TDS SCALE FACTOR
0.75
Total dissolved solids are estimated by multiplying conductivity
by an empirical factor. This factor can vary between 0.55 and 0.9
depending on the solubility of the ions in the water and its tem-
perature.
YSI 600 TEMPERATURE UNITS
• °F • •°C • • NOT MEASURED •
Select the appropriate temperature units.
Flow conversion is the method the flow meter uses to calculate
flow rate from the measurement of the area and velocity of the
flow stream.
Note
Accurate measurements of both area and level are essential
for accurate flow compilation. See Section 3.6, Area Velocity
Sensor Installation.
The 4250 can calculate flow either through area-velocity mea-
surements and area-velocity data points, or through level-to-flow
rate conversions using a standard primary measuring device or
level-to-flow rate data points.
If you wish to use the 4250 with a primary measuring device,
skip to Step 2 - Flow Conversion (Level-to-Flow Rate) fol-
lowing this section.
FLOW CALCULATION
• AREA VELOCITY • • LEVEL TO FLOW RATE •
If you select Area Velocity the following will appear:
AREA VELOCITY CALCULATION
• CHANNEL SHAPE• • DATA POINTS •
CHANNEL SHAPE uses the shape of the channel to calculate
the flow rate. DATA POINTS allows you to enter your own mea-
surements of area and velocity and the flow meter will calculate
flow rate based on your data. For now, select CHANNEL SHAPE.
4250 Flow Meter
Section 2 Programming
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