14
15
Selecting a Dissolved Oxygen Membrane:
Membrane
Type
Flow Dependence
After 4 Minutes
Required Sample
Movement
Typical Response
Time (T-95)
5913, 5908
Yellow
25%
6 inches/second
8 seconds
5914,
5909 Blue
18%
3 inches/second
17 seconds
DO UNITS
Highlight DO Units and press enter to open a submenu that allows you
to select the dissolved oxygen units to be displayed on the Run screen.
Highlight a unit and press enter to enable or disable it. An enabled
dissolved oxygen 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 DO units submenu.
There are three options for displaying dissolved oxygen:
•
mg/L will show DO readings in milligrams per liter on a scale
from 0 to 50 mg/L.
•
ppm (parts per million) is equivalent to mg/L and will show the
DO reading on a scale from 0 to 50 ppm.
•
% will show DO readings in a % saturation from 0 to 500%. This
value will be expressed as %L when DO Local% is enabled.
mg/L and ppm cannot be enabled and therefore displayed at the
same time. DO% and mg/L
or
ppm can be enabled and displayed
simultaneously.
AUTO STABLE
Auto Stable utilizes preset values to indicate when a reading is stable.
The preset values are adjustable in the System Setup menu. The user
can input a % change in measurement reading over ‘x’ amount of time
in seconds (3 - 19). There are two separate Auto Stable controls, one for
dissolved oxygen readings (DO Auto Stable) and one for ISE readings
(ISE Auto Stable). They are located on the second page of the System
Setup menu.
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.
DO Auto Stable can be set to a % change of 0.0 to 1.9% over 3 to 19
seconds.
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 applied to the pH measurement or
the ORP mV reading depending on which sensor is enabled in the ISE
Sensor menu.
To enable Auto Stable, highlight either DO Auto Stable or ISE 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.
ISE SENSOR TYPE
ISE Sensor Type sets the type of ISE sensor being used; either pH
(model #1001 or #1001A) or ORP (model #1002).
Use the up or down arrow keys to highlight ISE Sensor Type, then press
enter to open a submenu. Highlight the sensor type corresponding
to the sensor installed on the cable and press enter to confirm. The
enabled sensor type will have an ‘X’ in the box next to it. Next, use the
down arrow key to highlight the ESC – Exit box, then press enter to
save changes and to close the sensor submenu.
ISE UNITS
Highlight ISE Units and press enter to open a submenu that allows you
to select the ISE units to be displayed on the Run screen. Highlight a
unit and press enter to enable or disable it. An enabled ISE 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 ISE Units submenu.
When pH is enabled in the ISE Sensor Type menu, there are two
selectable measurement units: pH and pH mV. pH mV is the sensor’s
electrical measurement signal before being converted into pH units. pH
