11 Checking, Adjusting and Calibrating the Instrument
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11.3 Adjustments
11.3.1
Performing an Air/Water Adjustment
An air/water adjustment has to be performed if the water check had a "not
passed" result and using freshly degassed ultra-pure water and cleaning the
measuring cell did not help.
The adjustment media are dry air and freshly degassed ultra-pure (bi-distilled or
deionized) water.
The ThermoBalance
TM
technology allows for precise measurements over the
whole temperature range with only one adjustment at 20 °C. To achieve the
maximum possible precision of measurements at different temperatures, you can
additionally perform a temperature range adjustment (see Chapter 11.3.2).
The air/water adjustment takes 5 to 10 minutes if the instrument is already clean
and dry and equilibrated to 20 °C.
The adjustment procedure can be aborted by tapping <Cancel>.
To perform an air/water adjustment
1. Tap <Menu> and select
"Checks/Adjustments > Air/Water Adjustment"
.
2. Rinse the measuring cell.
TIP
If you use undenatured ethanol as the last rinsing liquid, only 3-4 minutes drying
time are required.
3. Tap the <Air Pump on> button to dry the measuring cell.
4. Tap <OK>.
The atmospheric pressure is displayed. The air pressure is measured
automatically by a built-in sensor.
5. Tap <OK>.
The air adjustment routine is carried out.
6. Fill freshly degassed ultra-pure (bi-distilled or deionized) water into the
measuring cell and tap <OK>.
7. Check that the water is filled without air bubbles.
TIP
If the water was filled without air bubbles, you can ignore a possible error
message "Density Condition: filling warning" during the adjustment routine. The
coefficients for the FillingCheck
TM
function are also adjusted during the
adjustment procedure.
