The viskomat NT is a versatile rotational
viscometer for determing the workabilty of fine-grained building
materials such as cement paste, mortar, fine concrete, plaster etc.
with a maximum particle size of 2 mm. You can obtain information on:

• flow curves and rheological parameters
• temperature dependent workability
  properties
• stiffening behavior as a function of
  time an stirring speed
• effects of concrete admixtures and
  mineral blending agents on workability

Not only is all this information useful
for the materials themselves, but tests have shown that trends
established, for example, in mortar are reflected in the behaviour of
concrete at full scale.

Construction and operating principles

The viskomat NT is a true speed controlled
viscometer driven by a high precision synchron motor. Each rotation
is resolved whithin 200.000 steps. It allows ramping from 0.001 rpm
to 300 rpm in both directions to record flow curves and yield points.
The torque up to ±250 Nmm or ±500 Nmm is measured by a special transducer. 

The standard measuring system consists of a
stationary paddle which is mounted concentrically in a rotating
cylindrical sample container. As the sample flows around the paddle
the shear resistance generates a torque which is continuously
monitored electronically. The paddle is mounted on a measuring head,
which runs up and down automatically to allow easy filling, emptying
and cleaning of the sample container. The sample container is mounted
on a speed drive shaft.

The temperature is measured by a sensor
located within the measuring paddles. 

All the electronic is housed in a separate
case. One powerful microprocessor and two special signal processors
does their work there. An online display shows torque, time and
temperature during the measurement in a graphical way. The electronic
has  an network interface. With the network interface you can integrate the Viskomat
NT in any computer (100 Mbit, RJ45) network. The Viskomat NT has
an built in WEB Server so any WEB browser like Internet Explorer (R) , Firefox, Opera or others, may be used as user
interface, the Viskomat NT can be remote controlled from any
workplace in your local area network.  No extra software has to be installed on your PC.

Features

• robust apparatus for industrial
  environments, quality control, research and development
• informative, easy to use test
  procedures
• automatic running of predefined test
  procedures which can be either standardized or tailored to your own
  requirements
• inhomogeneous materials measurable
  with particles up to 2 mm using special paddles to avoid separation and secregation.

Basic Data