YSI Pro2030 - Manual (Page 12)

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sPecIfIc conductance teMPerature
coeffIcIent (sPc %/°c)
SPC %/°C (Specific Conductance Temperature Coefficient) is the temperature
coefficient used to calculate Specific Conductance. The coefficient range is 0.00
to 4.00. The default value is 1.91% which is based on KCl standards.
To change the temperature coefficient, highlight SPC %/°C and press enter to
open the submenu. With the temperature coefficient highlighted, press enter
to make the field adjustable. Next, use the up or down arrow key to increase or
decrease the value. Press enter to save the new coefficient. Next, highlight the
ESC-Exit box and press enter to close the submenu.
tds constant
TDS Constant is a multiplier used to calculate an estimated TDS (Total Dissolved
Solids) value from conductivity. The multiplier is used to convert Specific
Conductance in mS/cm to TDS in g/L. The Pro2030’s default value is 0.65. This
multiplier is highly dependent on the nature of the ionic species present in the
water sample. To be assured of moderate accuracy for the conversion, you must
determine a multiplier for the water at your sampling site. Use the following
procedure to determine the multiplier for a specific sample:
Determine the specific conductance of a water sample from the site; 1.
Filter a sample of water from the site; 2.
Completely evaporate the water from a carefully measured volume of 3.
the filtered sample to yield a dry solid;
Accurately weigh the remaining solid; 4.
Divide the weight of the solid (in grams) by the volume of water used 5.
(in liters) to yield the TDS value in g/L for this site;
Divide the TDS value in g/L by the specific conductance of the water in 6.
mS/cm to yield the conversion multiplier. Be certain to use the correct
units.
If the nature of the ionic species at the site changes between sampling studies, the
TDS values will be in error. TDS cannot be calculated accurately from specific
conductance unless the make-up of the chemical species in the water remains
constant.
To change the TDS Constant in the Pro2030, highlight TDS Constant and press
enter to open the submenu. With the TDS Constant highlighted, press enter to
make the field adjustable. Next, use the up or down arrow key to increase or
decrease the value. The input range is 0.30 to 1.00. Press enter to save the new
TDS Constant. Next, highlight the ESC-Exit box and press enter to close the
submenu.
teMPerature unIts
Highlight Temperature Units and press enter to open a submenu that allows
you to change the temperature units displayed on the Run screen. Highlight
the desired unit (Celsius or Fahrenheit) and press enter to enable. The enabled
temperature unit will have an ‘X’ in the box next to it. only one unit may be
enabled at a time. Highlight the ESC-Exit box and press enter to save any changes
and to close the Temperature Units submenu.
Pressure unIts
Highlight Pressure Units and press enter to open a submenu that allows you to
change the barometric pressure units displayed on the Run screen. Highlight
the desired unit (mmHg, inHg, mbar, psi, or kPa) and press enter to enable. The
enabled pressure unit will have an ‘X’ in the box next to it. only one unit may
be enabled at a time. Highlight the ESC-Exit box and press enter to save any
changes and to close the Pressure Units submenu.
language
Highlight Language and press enter to open a submenu that allows you to
change the language. Highlight the desired language (English, Spanish, German,
or French) and press enter to enable. The enabled language will have an ‘X’ in the
box next to it. Highlight ESC-Exit box and press enter to save any changes and to
close the Language submenu.
The text in the boxes along the bottom of the Run screen will always be displayed
in English regardless of the language enabled in the System Setup menu.
auto shutoff
Auto Shutoff allows you to set the instrument to turn off automatically after a
period of time. Use the up or down arrow keys to highlight Auto Shutoff, then
press enter to open the submenu. Press enter while the minute field is highlighted
to make it adjustable. Next, use the up or down arrow keys to adjust the shut
off time from 0 to 60 minutes. Press enter to save the new shutoff time. Next,
highlight the ESC-Exit box and press enter to close the submenu.
To disable Auto Shutoff, set the Time in Minutes to 0 (zero).