TA Instruments TGA 2950 - The Hi-Res TM Ramp Segment

TA I NSTRUMENTS TGA 2950 B–9
Hi-Res
TM
Option
The Hi-Res
TM
Ramp Segment
The new Hi-Res
TM
ramp segment varies the
heating/cooling rate of the furnace in response to
changes in the rate of decomposition of the
sample so as to improve weight change resolu-
tion. The new segment has the following
format:
Ramp <rate>
°
C/min res <res_setting> to
<temp>
°
C
where:
<rate> is the maximum ramp heating rate
(0.01 to 200
°
C/minute)
<res_setting> is the resolution setting
(-8.0 to +8.0)
<temp> is the ramp final temperature
(-200 to 1000
°
C)
example:
Ramp 50.00
°
C/min res 4.0 to
800.00
°
C
The Hi-Res
TM
ramp segment operates similarly
to the traditional constant heating rate ramp
segment, except that the heating rate is varied
dynamically during the ramp in response to the
derivative of weight change (%/minute). As
percent/minute increases, heating rate is de-
creased. As percent/minute decreases, heating
rate is increased. The heating rate is constrained
to the range 0.001
°
C/minute (minimum) to the