A&D Weighing FX-300i-PT - Manual (Page 7)

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NOTE For detailed information on WinCT-Pipette, refer to “How to use WinCT-Pipette.pdf” in the
WinCT-Pipette CD-ROM.
Main Window
When WinCT-Pipette starts up, the window below opens
Specifications
Enter the pipette volume, specifications of
accuracy and repeatability used for
pass/fail judgment.
Measured Values
Displays the mass values transmitted from the
balance and the volumetric values obtained
using the Z factor.
Measurement Results
Displays the measurement results and
judgment results.
1-4 Function of the Evaporation Trap
In the pipette accuracy test using the gravimetric method, to obtain the mass of the test liquid, distilled
water is dispensed from the pipette into the sample cup installed on the balance. The obtained value,
however, is generally smaller due to evaporation loss of the test liquid. To prevent evaporation of the test
liquid, the evaporation trap is used. The ISO 8655 standard recommends that the humidity of the
measurement environment be greater than 50% RH.
Water is poured into the groove of the evaporation trap. This helps to maintain the humidity inside
the evaporation trap high and reduces evaporation. Using the evaporation trap reduces the
evaporation of the test liquid to about 25% or 0.05 mg per minute, compared with the value when the
evaporation trap is not used. This yields a measurement environment where there is no need to
consider measurement errors due to evaporation loss of the test liquid.
Another function of the evaporation trap is one as a breeze break, to prevent drafts in the
measurement environment from influencing the weighing operation and enable a stable weighing.
The evaporation trap is designed for an easy dispensing of the test liquid. The upper part has a
sloped surface so that the pipette can be inserted from obliquely above.
The Z factor is automatically calculated using the values of
the distilled water temperature and the barometric pressure.
Measurement environment
Enter the ambient relative humidity,
the distilled water temperature and
the barometric pressure.