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February 2004

Application for SV series - 54946 Examples of Viscosity Measurement With Sine-Wave Vibro Viscometer SV-10Concerning Typical Lubricants (Viscosities at 40°C and 100°C in Particular)

Marketing Division, A&D Co., Ltd. Introduction
The results of viscosity measurement with the sine-wave vibro viscometer SV-10 concerning four types of lubricants provided from a customer as sample will be described hereinafter. Sample and Instrument
1. Sample Viscosities of four typical lubricants, described below, provided by a customer for determining viscosity were measured.1: Hydraulic oil, standard type2: Diesel engine oil, standard type3: Automatic transmission fluid, luxurious type4: Gasoline engine oil2. InstrumentThe sine-wave vibro viscometer SV-10 (made by A&D Co., Ltd.), which measures viscosity by vibrating its sensor plates immersed in a sample at relatively low frequency (approx. 30Hz) of sine-wave, was used as the measuring instrument of viscosity. Since the instrument produces low frequency and very small amplitude (approx. 0.4mmpp), it does not impair the composition of the sample unlike a rotational viscometer. The instrument can measure viscosity of a sample according to the temperature of the entire sample due to the small thermal capacity of the sensor plate, and it is also possible to perform real-time measurement of the correlation between the viscosity and temperature of the sample. The instrument can measure viscosities ranging from 0.3mPa·s to 10000mPa·s (10Pa·s) with no need to change the sensor plates during the measurement, thus continuous measurement of viscosity is possible from low to high viscosities. Method
This viscositymeasurement, as shown in Fig.1, was performed while observing the behavior displayed in real-time on the screen of a personal computer connected to the viscometer SV-10 via RS232C interface.The procedure of the viscosity measurement was as follows; after completely washing and drying a 200ml glass beaker, an unopened tank of the sample was rolled over several times slowly enough to agitate the content before approx. 150ml of the sample was poured into the beaker, and then viscosity measurements were performed on a hot stirrer.1. The height of the sensor unit (head) of SV-10 was adjusted to fix the sensor plates in the prescribed position.2. The hot stirrer was rotated to stir the sample slowly, preventing it from making viewable ruffles on the liquid surface.3. The viscosity measurement was started at room temperature and the viscosity was measured for approx. five minutes.4. The heater of the hot stirrer was turned on and measurement was continued while heating the sample until the temperature of the sample reached approx. 110°C.5. The hot stirrer was turned off when the temperature of the sample reached approx. 110°C, and the sample was left at room temperature to naturally cool to approx. 30°C while the viscosity continued to be measured.In brief, for each sample of the four lubricants, a continual viscosity measurement was performed following the above procedure 1 to 5 while stirring slowly and continually changing the temperature of the sample from approx. 1/6