Product category:
Liquid Analysis: Viscosity, Density
News Release from: Labtex | Subject: ViscoPakt
Edited by the Processingtalk Editorial
Team on 30 March 2006
Stirring with precise torque measurement
The Visco-Pakt measuring stirrer is a strong torque stirring system with speed regulation, torque control and state of the art measurement sensitivity, designed for use with reaction vessels
The Visco-Pakt measuring stirrer is a strong torque stirring system with speed regulation, torque control and state of the art measurement sensitivity The drive unit requires only a fraction of the space needed by the previous measuring stirrer, allowing more valuable space for the reactor head
This article was originally published on Processingtalk on 31 Oct 2005 at 8.00am (UK)
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The small dimensions of the drive are achieved by separating the stirrer from its control unit.
The separate controller has a keypad and an LCD display, which shows the torque and rotational speed.
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The measured torque is automatically corrected using the independent "zero torque".
In many applications ViscoPakt delivers important additional information, for example for polymerisation and polycondensation.
The initiation or completion of a reaction, can cause a change in the viscosity, which can be identified via the torque.
The power dissipated from stirring, interesting for reaction calorimetry, can be determined from the torque and speed of rotation.
The ViscoPakt-rheo was developed for applications for which the exact torque, viscosity or the dissipated energy and a precise control of the rotational speed are needed.
Due to the design having no gearing, an extraordinarily large range of torque can be continuously achieved with no switching.
Glass stirrers are protected from breaking by a soft start up and torque limiters.
The torque measurement sensitivity is impressive.
Variations from the viscosity of water are recorded.
Fields of Application.
* System mixer for automatic laboratory reactor.
* Viscosity sensing.
* Identification of reaction phases.
* Detection of stirrer dissipation in the reaction calorimeter.
* Measurement of "rheological" material properties.
* Scale-up experiments.
* Process monitoring.
Characteristics and Functions.
* Powerful and compact.
* High precision measuring, robust measurement technique.
* Identification of rotational speed and torque.
* Auto calibration of zero-torque.
* Selectable restart response after power failure.
* Smooth start-up, adjustable gradient.
* Wide and continuous range of rotational speeds.
* Rotational speed and torque limitation, adjustable.
* Protection category PELF (low operating voltage) to VDE 0100 part 410.
* Quick catch chuck.
* Low noise operation ViscoPakt.
The standard design is equipped with a simple rotational speed output, which shows the viscosity trends.
Variations in rotational speeds from load fluctuations are electronically compensated.
The rotational speed can be pre-set via an analogue input or the serial interface.
The torque and the required rotational speed are given via the analogue port and the serial interface.
The ViscoPakt-Rheo model series is equipped with a precision-torque measurement.
The zero torque, which depends on the rotational speed, is registered by an automatic calibration process and is used to correct the torque signal.
This allows the determination of the viscosity as well as other rheological parameters online.
Changes to the rotational speed, which are caused by load fluctuations, are registered by a digital revolution counter and are electronically regulated.
The rotational speed can be pre-set via an analogue port or the serial interface.
The actual rotational speed and the torque are given via the analogue port and the serial interface. Request a free brochure from Labtex ...
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