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I n t e r p r e t i n g D r y i n g M o n i t o r Tr e n d
C u r v e s -
N o r m a l O p e r a t i o n
( c o n t i n u e d )
In normal operation with material flowing through to the process, readings from T1, T2 and
T3 will typically be very close to the process air temperature. T4 and T5 (and T6 if it is
located in material) will display temperatures descending in value from the process tempera-
ture.
In normal operation with material flowing through to the process, if T6 is located in the air
space at the top of the hopper (where there is no material), it will display a higher tempera-
ture than T5, which is typically located within the material. This is because a sensor in the
open air is not in contact with heat-consuming resin. This is especially true at higher
(275+°F) drying temperatures.
The hopper design, and how the material comes to rest in the hopper (the “angle of repose”)
and the loading system being used typically dictate the size of the “no-material” area at the
top of the hopper depending upon:
●
where the demand switch for loading more material is located
●
how far into the hopper the discharge of the loader/receiver extends
The DM can show a reaction to successful automated material loading as a drop in the T5
temperature (from the loading of new, cold material), alternating with a rise of T5 (as the
new material absorbs drying heat). This reaction can be seen as a saw-tooth up/down tem-
perature pattern.
NOTE:
Hoppers being used
at less than full capacity
(hoppers using demand
sensors on their viewing
windows for loading, small
drying jobs, hoppers that
are larger than necessary
for the drying task, etc) are
likely to have more than
one sensor exposed to air
and not material, and this
should be taken into con-
sideration when analyzing
DM data. This considera-
tion is also important when
selecting the “ alarm loca-
tion” sensor.
(See
Operation: Setting Up Your
DM: The Basics-Alarm
Location.)
✐
A p p e n d i x l
C - 3 5
Summary of Contents for Carousel Plus D Series
Page 6: ...iv l Table of Contents...
Page 20: ...2 8 l Description...
Page 40: ...3 8 l Installation...
Page 54: ...4 14 l Operation Control Function Flow Charts From the Login Logout screen Home Login Screen 3...
Page 90: ...4 50 l Operation...
Page 112: ...5 16 l Maintenance...
Page 208: ...C 46 l Appendix...