Overview
JINGKELIAN NDJ-8S Digital Viscometer is a digital rotational viscometer with a measurement viscosity range of 1~ 2 × 106 mpa.s, powered by AC power supply, equipped with four standard rotors and a variety of adjustable speeds. The instrument adopts LCD backlight display, with smooth speed, good accuracy, programmed design, easy operation, error alarm and other functions. The screen can directly display information such as viscosity, speed, percentimeter torque, rotor number and liquid temperature. Its full scale and each gear Linearity are corrected through PC interface. Measurement performance and functions reach the same type of professional level in China. The NDJ-8S Viscometer can be used to determine the absolute viscosity of Newtonian liquids, or with data processing software to accurately measure and analyze the apparent viscosity of non-Newtonian liquids.
Features
1. Digital rotational viscometer, Measurement range (1~ 2 × 106 mpa.s).
Equipped with four standard rotors and a variety of adjustable speeds (0.3, 0.6, 0.5, 3, 6, 12, 30, 60 rpm).
3. Using LCD backlight display, it can display information such as viscosity, speed, percentile torque, rotor number and liquid temperature at the same time.
4. It has the functions of stable speed, good accuracy, programmed design, easy operation, and error alarm.
5. Measurement and correction of full scale and each gear Linearity are carried out through PC interface, Measurement performance reaches the same type of professional level in China.
6. The absolute viscosity of Newtonian liquids can be measured, or the apparent viscosity of non-Newtonian liquids can be analyzed by software measurement.
Principle
The NDJ-8S series swirl/spin digital display Viscometer is controlled by a single chip microcomputer. It is an intelligent viscosity detection instrument with data collection, processing and display functions. The instrument controls the stepper motor to run accurately and smoothly according to the set speed, and drives the rotor to rotate through the hairspring. When the rotor is not subject to liquid resistance, the rotor swirl/spin synchronously with the motor; when the rotor is subject to the measured liquid resistance, its swirl/spin will lag behind the motor. When the tension and liquid resistance of the hairspring reach equilibrate, the rotor lags behind the opening angle of the motor and is fixed. By measuring the opening angle, the microcontroller calculates the viscosity of the measured liquid according to the set rotational speed and rotor number, and displays it on the LCD screen.
Applications
Solvent viscosity, latex, biochemical products, paints, Coatings, cosmetics, inks, pulp, starch, food
Notice
• Since viscosity is a function of temperature, when working at room temperature, the temperature deviation should be controlled at +/- 0.1 ° C, otherwise it will affect the measurement Precision, Thermostatic bath is required if necessary.
• Keep the rotor surface clean.
• Please pay attention to the angle percentage when measuring, the value should be between 20% -85%. When the value is too high or too low, the rotor should be replaced or the speed should be changed, otherwise it will affect the measurement Precision.
• When loading and unloading the rotor, be careful to lift the universal joint slightly upward, and do not use too much force. Do not force the rotor laterally, and do not pull the rotor down to avoid damaging the shaft tip.
• Universal connectors should be kept clean.
• When the instrument descends slowly, it is best to hold it by hand to avoid vibration damaging the axis.
• When the instrument is transported or moved, the universal connector should be covered with a protective cap.
• For "non-Newtonian" liquids such as suspensions, emulsions, polymer materials and some high-viscosity liquids, the apparent viscosity value has a nonlinear relationship with the shear speed, so when using different rotors, different speeds or measurement times, the viscosity measurement value may be inconsistent. This is a normal phenomenon, not an instrument test error.
