Teledyne 4220 - Manual (Page 57)

4220 Flow Meter
Section 2 Programming
2-29
This value is provided because conductivity rises (~2%/ °C) with
temperature. The default setting is 1.91%. This value is the tem-
perature coefficient for pure KCl (potassium chloride) in water.
For other salts this value will be somewhat inaccurate, but it
does provide a close approximation for solutions of many common
salts, such as NaCl (sodium chloride), NH
4
Cl (ammonium
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:
T.D.S. stands for “total dissolved solids.” T.D.S. are measured in
parts per thousand (ppt).
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.
Select the appropriate temperature units.
2.4.4 Step 2 - Flow
Conversion
(Level-to-Flow Rate
)
WEIR/FLUME = weir or flume; EQUATION = equation;
MANNING = Manning; DATA POINTS = data points.
If you select WEIR/FLUME, the following will appear:
For detailed information on weirs and flumes, refer to the Isco
Flow Measurement Handbook. Consulting the manufacturer of
the specific weir or flume is also worthwhile. Note that for weirs
and flumes, there is a preferred location for installing the level
measuring device. Proper mounting of the level measurement
device and accurate measurement of the level in the flow stream
at the calibration point are essential for accurate flow calculation
by the flow meter. If you select WEIR, the following display will
appear:
YSI 600 CONDUCTIVITY PARAMETER
• YSI T.D.S. • • NOT MEASURED •
TDS SCALE FACTOR
0.75
YSI 600 TEMPERATURE UNITS
• °F • •°C • • NOT MEASURED •
FLOW CONVERSION TYPE
• WEIR/FLUME • • EQUATION • • MANNING • • DATA POINTS •
TYPE OF DEVICE:
• WEIR • • FLUME •
SELECT TYPE OF WEIR:
• V-NOTCH • • RECTANGULAR • • CIPOLLETTI •