TQ-812 Online Rotational Viscometer

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TQ-812 Top-Mounted Online Rotational Viscometer

Product ID：ZXND004

Price: Please inquire PDF Format

Supply Ability:50SETS/MON

Port:SHENZHEN

Product Introduction
Other information

Model NumberTQ-812

Brand NameSHITONGKECHUANG

Payment TermsTT，PAYPAL，Alibaba.com Pay

TQ-812 Top-Mounted Online Rotational Viscometer

Product Introduction
The TQ-812 Top-Mounted Online Rotational Viscometer is designed for continuous, real-time viscosity measurement and process monitoring. Using a coaxial-cylinder rotational measurement system, it measures the resistance generated when a sensing element rotates in a fluid under controlled shear conditions.
The TQ-812 supports adjustable shear rates and provides a linear 4–20 mA analog output for connection to process control systems, PLCs, data acquisition equipment, and compatible controllers. It can be installed directly on a tank or adapted to a suitable pipeline configuration.
By providing continuous online viscosity data, the TQ-812 helps manufacturers monitor product consistency, improve process control, and reduce the labor, material consumption, and time associated with frequent offline sampling.

Performance Features
• Continuous Online Measurement: Provides rapid, ongoing viscosity monitoring during production.
• Coaxial-Cylinder Measurement: Measures fluid resistance within the defined measurement gap.
• Adjustable Shear Rate: Supports different shear conditions for process monitoring and rheological evaluation.
• Linear Analog Output: Supplies a 4–20 mA signal for integration with compatible automation systems.
• Flexible Installation: Supports tank-mounted installation or suitable pipeline installation.
• Process Quality Control: Viscosity data can be used to monitor product consistency and support automatic process adjustments.
• Wide Measurement Range: Covers viscosities from 2 to (1 \times 10^7) mPa·s, according to the supplied specifications.
• Broad Temperature Range: Specified for process temperatures from −25°C to +300°C.
• Optional Controller: An additional controller can be selected according to application requirements.

Working Principle
The TQ-812 uses a rotational viscometry principle based on a coaxial-cylinder measurement system.
A drive unit rotates the sensing element at a controlled angular speed through a magnetic coupling or rigid shaft connection. As the sensing element rotates in the fluid, viscous resistance generates torque. The torque is related to the fluid's viscosity under the defined measurement geometry and shear conditions.
A torque sensor detects the resulting deflection and converts it into an electrical signal. The electronic unit processes this signal and generates a 4–20 mA output proportional to the configured measurement value. This signal can then be used for viscosity display, recording, monitoring, and process control through compatible equipment.

Technical Specifications

Parameter	Specification
Model	TQ-812
Instrument type	Top-mounted online rotational viscometer
Measurement principle	Coaxial-cylinder rotational measurement
Viscosity range	2 to (1 \times 10^7) mPa·s
Shear rate range	(1 \times 10^{-3}) to (1 \times 10^3) s⁻¹
Shear stress range	2–100 Pa
Operating temperature range	−25°C to +300°C
Measurement accuracy	±1%
Power supply	24 V DC
Maximum pressure rating	6.4 MPa (930 psi)
Analog output	4–20 mA
Installation	Tank-mounted or compatible pipeline installation
Controller	Optional

Note: The source does not specify the reference conditions for the ±1% accuracy, the viscosity range's measurement conditions, or the exact installation and output scaling configuration. Confirm these details for the intended process.

Application Scenarios
• Chemical Processing: Continuous viscosity monitoring of process fluids and chemical formulations.
• Fine Chemicals: Monitoring viscosity consistency during mixing and production.
• Pharmaceutical Manufacturing: Process monitoring where viscosity is a relevant quality parameter and the installation meets applicable requirements.
• Coatings and Resins: Monitoring viscosity changes during formulation and processing.
• Food and Beverage Processing: Online viscosity monitoring for compatible products and hygienic installations.
• Polymer and Materials Production: Tracking viscosity changes during processing and material preparation.
• Industrial Automation: Feeding viscosity signals into PLCs, data loggers, and compatible process control systems.

TQ-812 vs. Conventional Offline Viscometers

Feature	TQ-812 Online Rotational Viscometer	Conventional Offline Viscometer
Measurement method	Continuous online monitoring	Typically measures collected samples
Process monitoring	Real-time measurement during operation	Requires sampling and separate testing
Analog output	4–20 mA	Depends on model
Automation integration	Suitable for compatible PLC and control systems	Depends on model and interface
Shear rate	Adjustable within the specified range	Depends on instrument type
Installation	Tank-mounted or compatible pipeline installation	Usually bench-top or laboratory installation
Labor requirements	Can reduce routine manual sampling	More operator involvement may be required
Main application	Process monitoring and quality control	Laboratory testing and offline quality checks

The two approaches serve different purposes. Offline laboratory measurements may still be needed for calibration, verification, and detailed rheological characterization.

Frequently Asked Questions
Q1: What is the TQ-812 viscometer used for?
It is designed for continuous online viscosity measurement, process monitoring, and viscosity-based quality control in industrial applications.
Q2: What is the viscosity measurement range?
The specified range is 2 to (1 \times 10^7) mPa·s. Actual usable range depends on the fluid, measurement configuration, and operating conditions.
Q3: What output signal does the TQ-812 provide?
It provides a 4–20 mA analog output for connection to compatible monitoring and process control equipment.
Q4: Can the TQ-812 be installed in a tank or pipeline?
Yes. The source specifies tank installation or adapted pipeline installation. Confirm the mounting arrangement and process connection for the specific application.
Q5: What is the operating temperature range?
The stated temperature range is −25°C to +300°C. Confirm that the selected sensing element, seals, connections, and installation accessories are suitable for the actual process temperature.
Q6: What is the maximum operating pressure?
The specified maximum pressure rating is 6.4 MPa (930 psi). The complete installation must also comply with the pressure ratings of all connected components.
Q7: Can the TQ-812 support automatic viscosity control?
Its 4–20 mA output can be connected to a compatible PLC or control system. Automatic adjustment of the process requires an appropriately designed control loop and suitable actuators.
Q8: Is a separate controller available?
Yes. The source indicates that a controller can be selected as an optional configuration.
Q9: Does the TQ-812 measure shear-dependent viscosity?
The instrument supports adjustable shear rates. For non-Newtonian fluids, viscosity readings can vary with shear rate, so the selected measurement conditions should be documented when comparing results.

Frequently Asked Questions
Q1: What is the TQ-812 viscometer used for?
It is designed for continuous online viscosity measurement, process monitoring, and viscosity-based quality control in industrial applications.
Q2: What is the viscosity measurement range?
The specified range is 2 to (1 \times 10^7) mPa·s. Actual usable range depends on the fluid, measurement configuration, and operating conditions.
Q3: What output signal does the TQ-812 provide?
It provides a 4–20 mA analog output for connection to compatible monitoring and process control equipment.
Q4: Can the TQ-812 be installed in a tank or pipeline?
Yes. The source specifies tank installation or adapted pipeline installation. Confirm the mounting arrangement and process connection for the specific application.
Q5: What is the operating temperature range?
The stated temperature range is −25°C to +300°C. Confirm that the selected sensing element, seals, connections, and installation accessories are suitable for the actual process temperature.
Q6: What is the maximum operating pressure?
The specified maximum pressure rating is 6.4 MPa (930 psi). The complete installation must also comply with the pressure ratings of all connected components.
Q7: Can the TQ-812 support automatic viscosity control?
Its 4–20 mA output can be connected to a compatible PLC or control system. Automatic adjustment of the process requires an appropriately designed control loop and suitable actuators.
Q8: Is a separate controller available?
Yes. The source indicates that a controller can be selected as an optional configuration.
Q9: Does the TQ-812 measure shear-dependent viscosity?
The instrument supports adjustable shear rates. For non-Newtonian fluids, viscosity readings can vary with shear rate, so the selected measurement conditions should be documented when comparing results.