YSI Pro1030 - Manual (Page 10)

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Using the Pro1030’s default reference temperature and temperature
coefficient (25 °C and 1.91%), the calculation is carried out as follows:
Specific Conductance (25°C) = Conductivity of sample
1 + 0.0191 * (T - 25)
T = Temperature of the sample in °C
specIfIc condUctance reference
teMperatUre (spc ref. teMp.)
SPC Ref. Temp. (Specific Conductance Reference Temperature) is the
reference temperature used to calculate Specific Conductance. The
reference temperature range is 15 and 25°C. The default value is 25°C.
To change the reference temperature, highlight SPC Ref. Temp. and
press enter to open the submenu. With the reference temperature
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 reference temperature. Next, highlight the ESC-Exit box
and press enter to close the submenu.
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 Pro1030’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:
1. Determine the specific conductance of a water sample from
the site;
2. Filter a sample of water from the site;
3. Completely evaporate the water from a carefully measured
volume of the filtered sample to yield a dry solid;
4. Accurately weigh the remaining solid;
5. Divide the weight of the solid (in grams) by the volume of water
used (in liters) to yield the TDS value in g/L for this site;
6. Divide the TDS value in g/L by the specific conductance of the
water in 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 Pro1030, 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.
langUage
Highlight Language and press enter to open a submenu that allows
you to change the language. Highlight the desired language (English,
Spanish, Portuguese, 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. In the setup menu, 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.