I. Overview
NDJ-5S Digital Rotational Viscometer is a new type of digital instrument developed on the basis of single-chip microprocessor technology for measuring the viscous resistance of liquids and the absolute viscosity of liquids. Compared with similar instruments, it has the advantages of high measurement accuracy, stable viscosity value display, easy to read, easy operation, and good anti-interference performance. It is widely used in the determination of the viscosity of various fluids such as oil, paint, food, medicine, adhesives, and cosmetics. .
2. Main technical performance
1. Measuring range: 10mPa·s~100000mPa·s
2. Rotor specifications: 1, 2, 3, 4 four rotors
3. Rotor speed: 6 rpm, 12 rpm, 30 rpm, 60 rpm
4. Measurement method: manual, automatic
5. Measurement error: ±5% (Newtonian liquid)
6. Dimensions: 105mm×120mm×160mm (excluding the base)
7. Net weight: 2.5kg (excluding the base) 8. Environmental conditions for use:
(1) The ambient temperature is 5°C~35°C;
(2) Relative humidity: not more than 80%;
(3) Power supply: voltage 220V±22V, frequency 50Hz±0.5Hz;
(4) There is no strong electromagnetic field interference, no violent vibration, and no corrosive gas near the product.
3. Working principle
1. The program-controlled motor drives the rotating shaft to rotate stably according to the speed given by the program, and then drives the standard rotor to rotate through the torque sensor. When the rotor rotates in a certain liquid, due to the viscosity of the liquid, the rotor receives a torque proportional to the viscosity, and the viscosity of the liquid can be obtained by measuring the torque through the torque sensor. In order to expand the measurement range, it is equipped with four standard rotors and given four speed gears.
2.要测量10mPa·s~100000mPa·s这样宽的粘度范围，需要采用不同组合的转子和转速。本仪器的转速分为四档，转子也分为四种不同的规格。由它们组成各种不同的组合，就可以测出测定范围内的任何粘度值。面板中间有上、下、左、右、回车5个组合键。开机时仪器显示上一次操作时的转子和转速值，可通过上下键查看和选择。测量某种范围的粘度，需用某种规格的转子和某种转速，可通过上下键和左右键来选择和设置。可先估计被测液体的大致粘度，选择合适的转子和转速。安装和设置好转子和转速，按下回车键即可开始测量。仪器内部带有数据存储器，存储仪器的量程，默认转子、转速、各种系数以及测试数据。微控制器According to用户的选择控制电机的转速。另外仪器还配备有RS232通讯口，可以与计算机进行双向的数据通讯。
3.仪器的转子保护架是为稳定测量和保护转子用的，使用转子保护架进行测定能取得较稳定的测试结果。
四、安装
1.从存放箱中取出支架和支柱等，将支柱旋入支架后部之螺孔中，用扳手将支柱拧紧，防止支柱转动并将支柱上的齿形面面向支架正前方。
2.从存放箱中取出粘度计，把粘度计的升降夹头装在支柱上，调整夹头紧松螺钉，不要过松，也不要过紧，旋转升降旋钮，使其能上下升降，偏紧为宜，以防粘度计产生自动坠落情况。
3.旋松产品下端的保护帽螺钉，取下黄色保护帽。
4.观察水平泡，调节支架下部的水平调整螺钉，使气泡在水平泡的中间位置，说明产品接近水平。
5.接上电源线。
五、操作使用
1.准备被测液体，置入直径不小于70mm的烧杯或直角容器中，准确地控制被测液体的温度。
2.将转子保护架装在仪器上（向右旋装入，向左旋卸下）。
3.将选配好的转子旋入连接螺杆（向左旋入装上，向右旋出卸下）。装卸转子时，需要用手将连接螺杆微微向上抬起。
4.旋转升降旋钮，使仪器缓慢地下降，转子逐渐浸入被测液体中，直至转子液面标志和液面相平为止。
5.再次调整好仪器水平。
6.试样在测试温度下充分恒温，以保持示值稳定准确。
7.面板操作：
(1)打开仪器背面的电源开关，进入等待用户选择状态，面板显示如下：
6. Matters needing attention
1. This instrument is suitable for use at room temperature, and the temperature of the sample to be tested should be within ±0.1°C, otherwise it will seriously affect the accuracy of the measurement.
2. The instrument needs to be used within the specified voltage and frequency and the allowable error range, otherwise the measurement accuracy will be affected.
3. Care should be taken when loading and unloading the rotor. The connecting screw should be lifted slightly. Do not use too much force, and do not let the rotor be subjected to lateral force, so as not to bend the rotor.
4. Do not put the instrument on its side or put it down after installing the rotor.
5. The end face and thread of the connecting screw and rotor should be kept clean, otherwise it will affect the correct connection of the rotor and the stability of rotation.
6. When the instrument is raised or lowered, it should be supported by hand to prevent the instrument from falling under its own weight.
7. After each use, the rotor should be cleaned in time (do not clean the rotor on the instrument). After cleaning, it should be properly placed in the rotor frame.
8. After installing the rotor, it is not allowed to "rotate" without liquid, so as not to damage the shaft tip.
9. Do not disassemble or adjust the instrument parts at will, and do not add lubricating oil by yourself.
10. When moving and transporting the instrument, put on the yellow protective cap, hold up the connecting screw, and tighten the screws on the protective cap.
11. Many of the suspensions, emulsions, polymers and other high-viscosity liquids are "non-Newtonian liquids", and the apparent viscosity value changes with the change of shear speed and time. The inconsistency of the results of the measurement under the rotational speed and time is normal, not that the instrument is inaccurate (generally, the determination of non-Newtonian liquids should specify the rotor, rotational speed and time).
12. Do the following points to measure more accurate values:
(1) Accurately control the temperature of the measured liquid;
(2) Ensure the uniformity of the ambient temperature;
(3) Immerse the rotor in the liquid to be tested for enough time and keep the temperature constant at the same time, so that it can be consistent with the temperature of the liquid to be measured;
(4) Ensure the uniformity of the liquid;
(5) Place the rotor in the center of the container as much as possible during the measurement;
(6) Prevent air bubbles from adhering to ;
(7) Measure with a gear close to the full scale as much as possible;
(8) Use the rotor protection frame to measure;
(9) Ensure the cleanliness of the rotor.
(10) Operate strictly in accordance with the rules of use.
