Digital Rotational Viscometer, 1 to 100000 mPa·s

Note: * The rotor 0# is required when the measuring viscosity is lower than 10 mPa·s.

NDJ Series Viscometer Datasheet.pdf

NDJ Series Viscometer Instruction Manual.pdf

Q1: What is a viscometer?
A1: A viscometer is an instrument used to measure the viscosity of fluids (liquids and gases). Viscosity is a physical quantity that indicates the internal friction within the fluid when the fluid is flowing. It is the ability of the fluid to resist deformation. It is an important indicator used to identify some finished or semi-finished products. Viscosity varies from fluid to fluid and varies with temperature. There are mainly three types of capillary viscometers, rotational viscometers and falling ball viscometers.

Q2: What is the definition of viscosity?
A2: When a liquid is flowing, the property of internal friction between its molecules is called the viscosity of the liquid. The viscosity of the liquid is expressed by viscosity, which is a resistance factor used to characterize the properties of the liquid. The viscosity of insulating oil is the same as the viscosity of general liquid, that is, the internal friction of the liquid, that is, when the insulating oil moves relative to laminar flow under the action of external force. The properties of insulating oil molecules that generate internal frictional resistance. The greater the internal friction of the insulating oil, the greater the viscosity, the more difficult the flow, and the poorer heat dissipation performance.

Q3: What is a viscometer used for?
A3: Viscosity is an important physical parameter used to measure the ability of liquids to resist flow. Using a viscometer to measure the viscosity of a liquid is an important means of industrial process control, improving product quality, and saving and developing energy. It is closely related to the fields of petroleum, chemical, electric power, metallurgy and national defense. Status plays an important role.

Tips: How to use a viscometer?

• The viscometer must be kept level.
• Avoid generating air bubbles when the rotor is put into the sample, otherwise the measured viscosity value will decrease. The way to avoid it is to put the rotor into the sample at an angle, and then install the rotor. The rotor cannot touch the wall and bottom of the cup. The sample to be measured must not exceed the specified scale.
• When measuring different samples, the rotor must be kept clean and dry. If the rotor has other samples or residual water after cleaning, it will affect the accuracy of the measurement.
• The maximum acidity (PH) should not exceed 2. If the acidity is too large, a special rotor should be used. When using ULA, the sample volume should be determined (only 16ml).
• Select the viscosity standard solution according to the measured viscosity range, and verify the instrument before each use of the viscometer, or check it regularly to ensure the accuracy of the measurement. It can provide Newtonian fluids in each viscosity range Properties of silicone oil or oil standard, the accuracy is ±1%, and the recommended use period of the viscosity standard solution is one year from the opening of the package.
• When connecting the rotor, use your left hand to gently hold and hold the mandrel (on the main unit), and rotate the rotor with your right hand. This operation is to protect the mandrel and hairspring in the body, which can prolong the service life of the viscometer.
• The value should be taken when the value is relatively stable, otherwise there will be a large error in the obtained value.

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