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Daily maintenance of viscometer

1. When starting up, be sure to turn on the power first, then turn on the power switch; when shutting down, be sure to turn off the power switch first, and then turn off the power.

2. The rotor should be cleaned after use and neatly placed in the black rotor box.

3. Keep the connection between the rotor and the shaft clean, and do not stain the sample.

4. If it is not used for a long time, a protective cap should be placed on the bottom of the rotating shaft.

5. Regular calibration with standard silicone oil.

Daily inspection of viscometer (customer):

1. For the digital viscometer, observe whether the model displayed matches the label on the back of the instrument when it is turned on. After auto-zeroing, observe whether the displayed percentage of its torque is within +/- 0.2. And turn the shaft by hand to observe the number of swings, more than 6 times for the LV model and about 5 times for the RV model, and there will be no sudden stop. If all the above checks are normal, the viscometer can be used normally.

2. Set the rotation speed at 100RPM, idle without installing the rotor, and observe whether the rotation of the shaft is concentric and whether there is no large swing.

1. Wear of steel tip and jewel bearing seat: This is a very common failure. The steel tip and gem seat are used to support the weight of the viscometer sensor, shaft and rotor. Under normal circumstances, they should be smooth and have little friction. However, due to the long-term contact between the two, or the operation is not careful, the steel tip is hard to grind. The surface of the gem seat is damaged, causing the surface of the gem seat to become uneven, so that the contact between the two is not a point but a surface, which increases the frictional resistance and affects the accuracy of the instrument. On the operation display of the instrument, the phenomenon that the torque is not "0" after power-on will appear (the dial shows that the pointer is not at "0").

2. Bending of the rotating shaft: It may be caused by the collision of the rotating shaft or the deformation of the rotating shaft for a long time. When the faulty instrument is idling at 100RPM, the shaft shakes greatly. Generally, if the shaft deviates from the axis by more than 0.8mm, it must be repaired and replaced.

3. The panel is out of control: This situation is due to long-term use and long-term keystrokes, which makes the keys ineffective and damaged.

4. After starting the zero calibration, the instrument display is not "0", but a negative number. This is because the customer did not remove the rotor from the spindle before auto-zeroing, or the rotor was already immersed in the sample.

5. During measurement, the instrument displays "EEEE", indicating that the measurement exceeds the "maximum measurement range". This is caused by the improper matching of the rotor or the rotation speed selected for the measurement.

6. PCB board damage: Because some customers use unstable power supply, the instantaneous voltage is too large, and the power board or display board is burned out, resulting in failure to boot or display data. At this time, a new circuit board needs to be replaced.

Why maintain?

With the passage of time, the aging of the instrument itself, the irregular operation of the user or the influence of the environment, the instrument may no longer be as reliable and excellent as it was when it left the factory. Some problems have been exposed, the instruments have failed and need our engineers to repair; while some problems have been hidden and have not erupted for the time being.

At this point, what should we do as users? How can we prolong the service life of the instrument and maintain the excellent state of the factory? People need regular physical examinations, and instruments also need regular inspection and maintenance to ensure a stable and excellent state and make you feel at ease. In order to ensure that your instrument is always in normal use, it is recommended that you do regular maintenance of the instrument. For laboratory viscometers, recommended maintenance frequency: once every six months for LV models; once a year for RV/HA/HB models.