User manual

3.13 Reading pH, temperature and conductivity values
The main operating menu 1 shows UV absorption, conductivity in
percentage of full range and pH. If the pH value is not stable or is
changing, an asterisk is displayed, i.e. pH*. This menu is reached
from any other menu by pressing ESC.
If temperature compensation is switched on, the display will show
Cond%
T
c instead of Cond%, see section B.2.4 Setup conductivity
temperature compensation
in Reference information.
By turning the dial three steps clockwise, main operating menu 2 is
shown instead. This display shows pH, temperature (in the
conductivity flow cell) and the actual conductivity in mS/cm
together with the percentage value. If temperature compensation is
switched on,
T
c
is shown in the display.
The display of pH, temperature and conductivity can be disabled, see
Section B.2 of Reference information.
3.14 Storage and shut-down
Storage of the UV flow cell
Overnight: The flow cell can be left filled with buffer.
Weekend and long term storage: Flush the flow cell with distilled
water and then fill it with 20% ethanol.
The flow cell can also be stored dry by flushing as above with
distilled water and then blowing a compressed inert gas such as
nitrogen (N
2
) through the cell. Replace the red protective caps.
Never use compressed air as this may contain droplets of oil.
Storage of the conductivity flow cell
Overnight: The conductivity cell can be left filled with a buffer.
Weekend or long term storage: Flush the conductivity cell with water
and fill with 20% ethanol.
CAUTION! Do not allow solutions which contain dissolved
salts, proteins or other solid solutes to dry out in the flow cell.
Do not allow particles to enter the flow cell as damage to the
flow cell may occur.
pH 12.50 22.4
735.8mS/cm
T
c 78.8%
AU Cond%
T
c pH*
0.00002 015.0 4.02
Monitor UPC-900
User Manual 18-1125-55 Edition AE
20
3 Operation