TA Instruments AR 2000, Operator'S Manual

Page: 77 / 144

AR 2000 Operator's Manual
7 7
Configuring the Upper Heated Plate
The temperature of the upper Upper
Heated Plate is controlled through the
instrument firmware. For the best perfor-
mance the control algorithm requires
accurate information concerning the
thermal properties of the Upper Heated
Plate and the cooling fluid. In the Rheol-
ogy Advantage control module, under the
Options menu click Instrument and then
the Temperature tab. The window box
shown in the figure to the right will
appear.
A list of the features are described as
follows:
• Cooling Temperature: The
temperature of the circulating water,
measured at the inlet: should be
entered manually. For the vortex air
cooler, use the value given in Table
7.3
• Cooling range: This is inversely
proportional to the flow rate. For the
vortex air cooler, use the value in Table 7.3. Typical values are given in the table below.
Table 7.3
Feed Temperature Flow Rate Range
Mains Tap Water 15 °C 0.75 Liter min
-1
5 °C
Fluid Circulator 5 °C 0.25 Liter min
-1
15 °C
Vortex Air Cooler 15 °C -- 100 °C
• Thermal mass: The energy required to raise the temperature of the upper platen. It is suggested that the
value of 65 J/°C, obtained by TA Instruments, be used unless other information is available.
• Gradient calibration span: Arrived at by calibration (see below) although a manual entry may be made.
• Gradient calibration offset: Arrived at by calibration (see below) although a manual entry may be made.
• Modeling enabled: If this box is checked, the temperature of the upper platen will be matched as closely
as possible to that of the Peltier plate during heating or cooling. This means that the heating or cooling rate
of both platens is constrained to that of the slower of the two (usually the upper platen). To remove this
constraint, allowing the faster platen to change temperature more rapidly than the slower, uncheck this
box.
Figure 7.15
UHP Configuration Window