one. Working purpose of digital rotary viscometer

Digital viscometers are suitable for measuring the absolute viscosity and rheological properties of various liquids and semi fluids. Widely used for measuring the viscosity of various liquids such as coatings, inks, cosmetics, food, drugs, petroleum, adhesives, etc. (Newtonian liquids) It has wide applications in scientific research such as petrochemicals, pharmaceuticals, food, light industry, and textiles. It is one of the most commonly used precision instruments in new product development and product quality control testing.

two. Working principle of digital rotary viscometer

The NDJ-8S digital rotary viscometer, controlled by a microcontroller, is an intelligent instrument with data acquisition, processing, and Chinese character display. The instrument controls the stepper motor to operate accurately and smoothly according to the set speed, and drives the rotor to rotate through the balance spring. When the rotor is not subjected to resistance, it rotates synchronously with the motor; When the rotor is subjected to the resistance of the measured liquid, its rotation will lag behind that of the motor. When the tension of the balance spring reaches equilibrium with the resistance of the liquid, the angle of the rotor lagging behind the motor is fixed. By measuring the opening angle and based on the set speed and rotor, the instrument calculates the viscosity of the measured liquid and displays it on the LCD screen. Compared with similar instruments, the NDJ-8S viscometer is not only easy to operate, stable in speed, high in measurement accuracy, and wide in working voltage range, but also has an automatic search function, which can search for the optimal rotor and speed required for measuring unknown samples.

three. Main technical indicators of digital rotary viscometer

Viscosity measurement range: 10-2000000 mPa · S

Optional rotor 0, with a measurement limit of up to 1 mPa·S

Viscosity measurement accuracy: ± 3% (full range)

Reproducibility of viscosity measurement: ± 0.5% (full scale)

Viscosity resolution: 1 MPa · S (using rotor 0 with a resolution of 0.1 mPa · S)

Standard rotor specifications: Four types of rotors: 1, 2, 3, and 4 (optional for rotor 0)

0.3, 0.6, 1.5, 3, 6, 12, 30, 60 revolutions per minute

Temperature measurement range: -50~99 ℃ (optional semiconductor temperature probe)

Temperature measurement accuracy: ± 0.5 ℃

Temperature resolution: 0.1 ℃

Dimensions: 95 * 130 * 155 (excluding chassis)

Net weight: 2kg (excluding chassis)

four.NDJ-8SDigital viscometerEnvironmental conditions for use

Environmental temperature: 5 ℃ -35 ℃ (recommended to use an environmental temperature of 20 ℃)

Relative humidity: ≤ 80%

Power supply: AC100~240V (50/60Hz)

There should be no strong electromagnetic interference near the product, no severe vibration, and no corrosive gases.

Technical parameters of various rotational viscometers