Caution:
For an optimum calibration process, the OTT ecoLog 800 (3G) and the
calibration solution must be at the surrounding temperature!
How to calibrate the conductivity sensor
Carefully clean the pressure probe and dry well (see Chapter 18.1).
Start the operating program.
Set up the PC/OTT ecoLog 800 (3G) communication link (see Chapter 9.2).
Press the "Setup device" button. (Button not visible?
➝
deactivate the "Only
observer mode" check box in the "Options" function in the "File" menu and
restart the operating program.)
Select the "Calibrate conductivity sensor" function in the "OTT ecoLog 800 (3G)"
menu.
Press the "Start zero point test" button. The operating program starts an instan-
taneous value measurement and updates this every 5 to 6 seconds. If the mea-
surement result displayed (blue triangle) is not in the green area
➝
clean the
conductivity sensor again and dry it well.
Press the "End zero point test" button.
Select the calibration solution used. Alternatively, select "Other ..." and enter
the appropriate conductivity value.
Add the calibration solution to the calibration container (filling height approx. 3/4).
Place the OTT ecoLog 800 (3G) into the calibration container (screw-on cover
in place) and tighten the screw-on cover by hand.
Caution:
There must not be
any air bubbles in the slot of the conductivity sensor! If necessary, lightly shake
the calibration container.
Press the "Start calibration" button. The operating program starts the instan -
taneous value measurement again and continuously updates it.
Wait until the values for conductivity and temperature do not change for sever-
al updates. The operating program displays the current and newly calculated
cell constant.
Caution:
Temperature values shown in red
➝
the conductivity
sensor is not at the temperature of the calibration solution! New cell constant
shown in red
➝
the cell constant lies outside the valid range.
Press the "End calibration" button.
Confirm the resulting question: "Save new cell constant?":
– cell constant is within the tolerance range
➝
"No"
(conductivity value is in the green area)
– Cell constant is outside the tolerance range and within the valid range
➝
"Yes" (conductivity value is in red area + current cell constant is shown in
black)
If the cell constant is outside the valid range
➝
error message.
Close the operating program.
Rinse the pressure probe thoroughly with clear water!
Reinstall OTT ecoLog 800 (3G) (see Chapter 8).
Determine current reference value with a contact gauge and enter it
(see Chapter 9.4 or 10).
Close the top cap/observation well cover.
Dispose of the used calibration solution!
Notes
Only use the calibration solution once!
Always store the calibration solution in a closed container! (The carbon dioxide
in the surrounding air and evaporation can change the conductivity value.)
Avoid water entering the calibration solution! Always dry the calibration con-
tainer carefully after calibration.
Calibration solution can be disposed of in the normal public sewer system!
The OTT ecoLog 800 (3G) saves the last three cell constants in a history (see
"Advanced operation ...", channel "Conductivity").
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Summary of Contents for ecoLog 800
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