1Ubbelohde viscometer constant temperature water bathPurpose and Scope of Application

The manufacturing of this instrument complies with the requirements specified in the industry standard SY/T5561 "Technical Conditions for Petroleum Product Kinematic Viscosity Testers" of the People's Republic of China. This instrument is suitable for measuring the kinematic viscosity of liquid petroleum products (referring to Newtonian liquids) under a constant temperature condition in accordance with the provisions of the Chinese standard GB/T265 "Determination of Kinematic Viscosity of Petroleum Products and Algorithm for Dynamic Viscometers".

IIUbbelohde viscometer constant temperature water bathWorking conditions for instrument use

1. The instrument should be placed on a flat and stable experimental platform.

2. The liquid measured by this instrument is a Newtonian liquid, and its viscosity is independent of shear stress and shear rate.

3. Within different testing temperature ranges, different constant temperature bath liquids should be used for the constant temperature bath.

4. When testing the sample, an appropriate capillary viscometer should be selected according to the experimental temperature. It is necessary to ensure that the flow time of the sample in the capillary is not less than 200 seconds, and the flow time in the capillary viscometer with an inner diameter of 0.4mm is not less than 350 seconds.

IIIMain technical specifications and parameters

• Working power supply: AC 220V ± 10%, 50Hz ± 5%.

2. Heating power: two levels, 1000W+600W.

3. Mixing motor: power 6W; Speed 1200r/min.

4. Temperature measurement range: room temperature~100℃.

5. Temperature control accuracy:±0.1℃.

6. Thermostatic bath: capacity, 20L; Form, dual cylinder with inner and outer layers.

7Usage environment: ambient temperature -10 ℃～+35 ℃, relative humidity<85%.

8. Temperature sensor:Industrial platinum resistance, with a division number of Pt100.

9. Whole machine power consumption:Not exceeding 1800W.

4Main structure and electrical schematic diagram

The instrument structure diagram is shown in Figure 1, and the electrical schematic diagram is shown in Figure 2.

Figure 1

Figure 2

• Double layer constant temperature bath:

This instrument adopts a double-layer cylinder constant temperature bath. The inner layer adopts a hard glass cylinder with a diameter of 300 × 300mm, the outer insulation sleeve is an organic glass cylinder with a diameter of 360 × 285mm, and there is an air insulation layer between the inner and outer layers. During the experiment, in order to prevent water vapor from entering the insulation layer and affecting the observation, dry air can be filled into the insulation layer (with the inflation equipment provided). There are two small holes on the bathtub cover, which are specially designed for placing thermometers and sensors. In addition, there are four capillary mounting holes that can simultaneously detect two sets of parallel samples.

• lighting:

This instrument is equipped with a 220V energy-saving lamp, which has high luminous efficiency and provides a guarantee for clear observation of the readings of the capillary viscometer.

• Temperature control system:

⑴ Temperature sensor: Industrial platinum resistance, with a division number of Pt100.

⑵ Temperature controller: It adopts a digital intelligent temperature controller with four dual LED (light emitting diode) indicatorsDisplay function, fast temperature control, fast response, small overshoot, temperature control accuracy of ± 0.1 ℃.

⑶ Heating system: 1000W and 600W dual electric heating tubes for fast heating; At the set observation temperature point, the heating power can be automatically adjusted to ensure stable bath temperature.

• Mixing system:

The mixing motor adopts 60YN06-2B non deceleration single-phase asynchronous motor, and heating and mixing are carried out inside the protective cover.

5Installation of

1. Open the packaging box, count the spare parts, and be careful to handle glassware, especially capillary viscometers, with care. Do not forcefully pull or plug them with your hands to avoid damage.

• Fasten the plumb ball on the hook of the rubberwood cover, adjust the bottom corner screw of the chassis to make the cylinder wall parallel to the vertical line.

• Insert the thermometer and sensor into the corresponding holes on the bathtub cover.

• Connect the heater socket at the back of the chassis to the 8-pin plug of the cylinder head, and connect the three pin plug of the sensor to the three pin socket of the chassis. Connect the three core power cord plug to the three core power socket.

6、 Usage method

（1） Preparation before testing

1. Before using this instrument, carefully read the user manual.

2. Carefully read the industry standard SY/T5561 "Technical Conditions for Petroleum Product Kinematic Viscosity Testers" of the People's Republic of Chinanational standardAccording to GB/T265 "Determination of Kinematic Viscosity of Petroleum Products and Algorithm for Dynamic Viscometers", understand and be familiar with the testing methods, procedures, and requirements outlined in the standard.

3. Prepare various testing instruments, materials, etc. for testing according to the requirements specified in the standard.

4. Check the working status of this instrument to ensure it meets the working environment and conditions specified in the manual.

5. Check the casing of this instrument, which must be in good grounding condition.

（2） Usage method

• According to the test temperature used, fill the bathtub with the liquids listed in the table below:

• Select an appropriate capillary viscometer based on the experimental temperature.

• Turn on the power switch on the instrument panel, and the switch indicator light will turn on. At this time, both display windows of the temperature controller will have digital displays. The PV displays the temperature inside the bathtub at this time, and the SV displays the set temperature value.

• Set the temperature control value according to the experimental requirements: Press the function key "SET" on the temperature controller panel once, and the SV value will flash. At this time, you can press the shift key "＜", the plus key "∧" or the minus key "∨" to set the required temperature values. After all the values are set, press the function key "SET" again to complete the temperature control value setting.

• When the temperature inside the bathtub reaches the set value, the output indicator (OUT) starts flashing and enters the temperature control state. After the measured value 'PV' stabilizes, use a glass thermometer to check whether the displayed value of the temperature controller instrument matches the actual value.

• If the actual value detected by the glass thermometer does not match the displayed value of the temperature controller instrument, correction is required. For example, when the instrument display value is 80.0 ℃ and the glass thermometer detection value is 79.7 ℃, press the "SET" button, and the PV window will display 5C, making the SV value display -0.3 (if the glass thermometer detection value is 80.3 ℃, make the SV value display+0.3). After correction, press the "SET" button to exit.

7. After the temperature inside the bathtub is correct and stable, the test can be conducted according to the testing method of the People's Republic of Chinanational standardAccording to the requirements specified in GB/T265 "Determination of Kinematic Viscosity of Petroleum Products and Algorithm for Dynamic Viscometers".