When judging whether the digital viscometer is accurate, we need to consider the error of the instrument itself and the standard liquid itself. For a certain combination of rotor and rotational speed, the measurement error range of the digital viscometer is the maximum viscosity value that can be measured under this combination. For standard liquids, the error range is (+/-) 1% of the nominal viscosity value.
For example:
Calculation The viscosity value measured by the LVDV-2+PRO digital viscometer at a speed of 60RPM and the No. 4 rotor is 8120.5 mPa.s, and the viscosity standard liquid provided by Shanghai Nirun Technology Co., Ltd. is 8100 mPa.s When checking its accuracy, allowable viscosity error range.
The maximum viscosity value of LVDV-2+PRO digital viscometer is 10000mPa.s when the rotation speed is 60RPM and the No. 4 rotor
Therefore, the error range of LVDV-2+PRO digital viscometer in the current situation is 10000cP*(+/-)1% = (+/-)100 mPa.s
2. Standard liquid viscosity error=8100*(+/-)1% = (+/-)81 mPa.s
3. Allowable viscosity error range = digital viscometer error range + standard liquid viscosity error range = (100+81) = (+/-)181 mPa.s
4. Therefore, when the reading is between 7919 mPa.s (8100-181) and 8281 mPa.s (8100+181), it proves that the measurement error of the digital viscometer is correct. Otherwise, the digital viscometer requires inspection and repair.
