Online rotational viscometer is an instrument used for real-time measurement of fluid viscosity, which can continuously monitor the fluid on the production line to ensure product quality and stability of the production process. The following are the key steps and precautions in its installation process:
1、 Preliminary preparation and environmental requirements
-Power and grounding guarantee: It is necessary to confirm that the power supply voltage meets the equipment requirements and ensure that there is a reliable grounding wire at the grounding terminal to prevent electrostatic interference. For imported equipment, attention should also be paid to the adaptation of current frequency conversion.
-Installation environment selection: A stable tabletop with constant temperature, no strong electromagnetic field interference, and no vibration should be selected. If there are vibration sources on site (such as pump and valve equipment), shock absorbers should be installed to isolate the transmission of vibration.
2、 Mechanical structure installation
-Host base fixation: Insert the toothed column into the circular hole of the host base, with the tooth surface facing straight ahead, and tighten the nut with a wrench to prevent rotation.
-Horizontal adjustment: Adjust the three horizontal screws on the base and observe the position of the leveling bubble to center it. Horizontal deviation can cause rotor eccentricity, leading to measurement errors and even damage to sensors.
3、 Assembly of rotor and transmission system
-Principle of rotor selection: Select the rotor model based on the estimated viscosity of the fluid, choose a large volume rotor for low viscosity, and a small volume rotor for high viscosity. At the same time, it is necessary to match the appropriate speed to ensure that the torque percentage is within the effective range of 20% -90%.
-Rotor installation specifications: During installation, the host shaft should be supported by hand, and the rotor should be rotated in with the right hand. It is forbidden to apply lateral force that may cause wear on the shaft tip. After installation, check the verticality of the rotor to avoid touching the container wall or bottom.
4、 Electrical connection and signal debugging
-Line access: Connect the power line to the signal output line (RS485/4-20mA), and pay attention to the single ended grounding of the shielding layer to resist interference. Confirm the insulation performance of the line again before powering on.
-Zero position calibration: After starting up, perform zero position detection (under no-load state), and then enter the calibration program. Use standard viscosity liquid to establish a rotor speed viscosity mapping model.
5、 System Integration and Validation
-Process docking: Integrate the viscometer into the pipeline system using flanges or threaded connections to ensure that the fluid flow direction is consistent with the sensor identification. For easily crystallizable media, it is recommended to install it downstream of the heat tracing pipe section.
-Trial operation test: Inject actual working fluid for 72 hours of continuous monitoring, and record the fluctuation range of data. If abnormal vibration or reading drift exceeds ± 2%, the rotor dynamic balance and sensor sensitivity need to be rechecked.
The precise installation of online rotational viscometers requires a balance between mechanical stability, electrical reliability, and fluid compatibility. It is recommended that enterprises establish standardized installation SOPs and regularly conduct personnel training to ensure the long-term efficient operation of equipment.