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Temperature greatly influences the rheological behavior of almost all substances. High precision temperature control is therefore essential for obtaining accurate rheological results.
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The main purposes of a temperature control system
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- Setting and measuring the absolute
temperature
- Holding a precise temperature and ensuring a uniform temperature distribution within the sample
- Preventing temperature overshooting during the controlling process (optimized temperature equilibrium)
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- Liquid temperature control
Using circulators for temperature control is a well established method. The liquid temperature control provides a very accurate temperature control of the lower measuring plate at a relatively low purchasing cost.
The selectable temperature range depends on the liquid bath used and is approx. -20 °C to +180 °C. The rheometer software RheoPlus can be used to control a series of circulators from different manufacturers to run temperature programs.
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- Temperature control devices
with Peltier elements
Peltier systems have a number of advantages over liquid temperature control systems. They are compact, easy to install units which are ready for operation almost immediately after switching on. Due to the special properties of the thermoelectrical effect, Peltier devices can be used for both heating and cooling.
Peltier systems work in the temperature range from -40 °C to +200 °C. This range is ideal for the majority of rheological measurements.
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Electrical resistance heating is especially suitable for higher temperature ranges and enables very high heating rates. Due to its optimized temperature control methods, this system is ideal for the investigation of temperature-dependent rheological properties, e.g. of polymers.
The temperature range of these systems spans from ambient temperature up to +400 °C. The sample is usually cooled by rinsing with air. The new plate system ETD 400 also allows liquid cooling or nitrogen cooling to be connected. This extends the lower temperature range to -130 °C.
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The engineers at Anton Paar have developed a new concept for the CTD series of high-precision temperature control system. This cell ingeniously combines the advantages of electrical heating (high temperatures, rapid heating rates) with those of convection heating (uniform temperature distribution via gas circulation).
The temperature range spans from ambient temperature to +600 °C or +1000 °C, depending on the chamber used. Using an optional nitrogen evaporator extends the range to -150 °C. A cooling circuit keeps the hood cool enough to touch even at working temperatures of +1000 °C.
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