A&D Weighing SV-100 - Manual (Page 23)

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6. VISCOSITY CALIBRATION
Viscosity calibration is to correct the viscosity value.
Two calibration methods are available: one-point calibration and two-point calibration, using
standard viscosity fluids.
With the SV-10, simplified calibration using purified water is available.
It is recommended that calibration be performed using a fluid with a known viscosity value
which is close to the sample viscosity.
When the measuring range is great, perform two-point calibration. Two-point calibration
requires two standard viscosity fluids (high viscosity and low viscosity) that are appropriate for
the measuring range.
With the SV-10, when measuring the viscosity near 1 mPa ⋅s, simplified calibration using
purified water, which is a one-key operation, is available. The SV-10 has a built-in function to
perform an automatic temperature compensation on the viscosity value, based on the
temperature of the purified water used.
In one-point and two-point calibration, the viscosity of a fluid with a known value, such as a
standard viscosity fluid, is measured, displayed, corrected digitally and saved in memory.
To obtain the absolute viscosity value precisely, use the correction value as described in
"4-4-2 At Calibration".
If the wrong calibration data such as a correction value have been entered, the viscometer
condition can be restored. For details, refer to "Initialization (Clr)" of the function setting.
6-1 Notes on Viscosity Calibration
Pay close attention to the liquid temperature at calibration. Be sure to enter the viscosity
value of the liquid temperature at calibration. Even a standard viscosity fluid has a viscosity
change of -2%/°C to -10%/°C, and purified water, a viscosity change of -2%/°C, when the room
temperature changes.
The temperature of the standard viscosity fluid must be the same as the temperature of the
sensor plates and the temperature sensor. Allow the displayed temperature to stabilize before
calibration.
Be sure to adjust the sample surface to the center of the narrow part of the sensor plates.
Otherwise, a measurement error may occur.
In the calibration mode, the unit of viscosity for the SV-10 is mPa ⋅s, for the SV-100, Pa⋅s.
The unit of temperature is fixed to °C.
The viscometer has been calibrated with the protector attached when shipped. Please note
that the value, obtained when the viscometer is calibrated without the protector, may be
different from that upon shipment.
If water other than purified water (such as tap water) is used for simplified calibration, or the
water temperature is different from the ambient temperature, bubbles may accumulate on the
sensor plates and cause a measurement error. Allow the sample to adjust to the ambient
temperature and remove any accumulated bubbles before calibration.
If the measured viscosity of the water is 3.00 mPa ⋅s or greater, it is contaminated and
simplified calibration can not be performed using it. Replace the water.