YSI Pro1030 - Manual (Page 9)

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When Auto Stable is enabled, an AS symbol will display next to the
reading on the Run screen and blink during stabilization. When the
ISE and/or conductivity reading stabilizes based on the Auto Stable
settings, the
AS symbol will display steadily and the instrument will
beep twice if Audio is turned on.
ISE Auto Stable can be set to a % change of 0.0 to 9.9% over 3 to 19
seconds. The auto stable criteria is be applied to the pH measurement
or the oRP mV reading depending on which sensor is enabled in the
ISE Sensor menu.
Conductivity Auto Stable can be set to a % change of 0.0 to 1.9% over
3 to 19 seconds. The conductivity auto stable criteria is applied to the
conductivity reading, but the AS symbol will display next to all enabled
conductivity units.
To enable Auto Stable, highlight either ISE Auto Stable or Cond. Auto
Stable, then press enter to open the submenu. Next, use the up or
down arrow keys to highlight the % change or seconds (secs) input
field, then press enter to make the highlighted field adjustable. Use
the up or down arrow keys to adjust the selected value, then press
enter to confirm changes. once you have confirmed any changes,
highlight the ESC-Exit box along the bottom of the display and press
enter to close the Auto Stable submenu. To disable Auto Stable, set the
% Change input to 0.0.
ph BUffer set
Highlight pH Buffer Set and press enter to open a submenu that allows
you to select the Buffer Set used for auto buffer recognition during
a pH calibration. There are two buffer set options: USA (4, 7 and 10)
and NIST (4.01, 6.86 and 9.18). Highlight the buffer set and press enter
to enable. The enabled buffer set will have an ‘X’ in the box next to it.
Highlight the ESC-Exit box and press enter to save any changes and to
close the submenu.
condUctIvIty UnIts (cond. UnIts)
Highlight Cond. Units (Conductivity Units) and press enter to open a
submenu that allows you to select the conductivity units to be displayed
on the Run screen. Highlight a unit and press enter to enable or disable
it. An enabled conductivity unit will have an ‘X’ in the box next to it.
Highlight the ESC-Exit box along the bottom of the display and press
enter to save any changes and to close the conductivity units submenu.
There are seven options for displaying conductivity. only two units can
be enabled at the same time:
• CoND-mS/cm displays conductivity in milliSiemens per
centimeter.
• CoND-uS/cm displays conductivity in microSiemens per
centimeter.
• SPC-mS/cm displays Specific Conductance in milliSiemens per
centimeter. Specific Conductance is temperature compensated
conductivity.
• SPC-uS/cm displays Specific Conductance in microSiemens
per centimeter. Specific Conductance is temperature
compensated conductivity.
• Sal ppt displays salinity in parts per thousand. The salinity
reading is calculated from the instrument’s conductivity
and temperature values using algorithms found in Standard
Methods for the Examination of Water and Wastewater.
• TDS g/L displays Total Dissolved Solids in grams per liter. TDS
is calculated from conductivity compensated to 25ºC using a
user-selectable TDS constant.
• TDS mg/L displays Total Dissolved Solids in milligrams per
liter. TDS is calculated from conductivity compensated to 25ºC
using a user-selectable TDS constant.
Note: 1 S = 1 mho.
1 milliSiemen = 1,000 microSiemens.
SPECIFIC CoNDUCTANCE
The conductivity of a sample is highly dependent on temperature,
varying as much as 3% for each change of one degree Celsius
(temperature coefficient = 3%/°C). In addition, the temperature
coefficient itself varies with the nature of the ionic species present in
the sample. Therefore, it is useful to compensate for this temperature
dependence in order to quickly compare conductivity readings taken
at different temperatures.
The Pro1030 can display non-temperature compensated conductivity
as well as temperature compensated Specific Conductance. If Specific
Conductance is enabled, the Pro1030 uses the temperature and
conductivity values associated with each measurement to calculate a
specific conductance value that is temperature compensated based
on a user-selected temperature coefficient (0 to 4%) and reference
temperature (15 to 25°C).