C - 2 2
l A p p e n d i x
S e t t i n g U p Yo u r D M : T h e B a s i c s -
A l a r m L o c a t i o n ( A d v a n c e d )
Why would an operator want to use the Advanced method for
selecting an RTD to use as the
Alarm Location
? The
advanced Alarm Location selection may be desirable for
processes where the operator wants to pick an RTD at a spe-
cific material residence time level at a given throughput. To
select an RTD as a monitoring position for the alarm setpoint
(advanced) the operator will need to consider the following
drying parameters:
●
hopper capacity (ft
3
)
●
throughput rate
●
bulk density
●
drying (residence) time
EXAMPLE calculation
1. lbs per hour throughput
100
2. drying time (residence time)
4 hours
3. material’s bulk density (lbs/ft
3
)
35 lbs/ft
3
4. drying hopper capacity (ft
3
)
15 lbs/ft
3
A 15 ft
3
hopper holds 525 lbs of material at 35 lbs/ft
3
(35 ft
3
x 15).
Use the chart in
Operation: Drying Hopper Volume by Model Number.
●
RTD T5 is likely at a 440 lb fill level (35 ft
3
x 12.6).
●
RTD T4 is at the 320 lbs level (35 ft
3
x 9.15)
This position is at the 3/4 point of the material load.
RTD T5 is closest to the desired monitoring point of 400 lbs (100 lbs/hr x 4 hrs).
Since T5 is closest to the desired monitoring point, select T5.
Check the temperature reading at T5 to confirm that the temperature is not at or below
the alarm set point (default is 30 deg. below process). If necessary, adjust the alarm set
point.
NOTE:
You will need to know
the bulk density of your mate-
rial to calculate your drying
hopper volume in cubic feet
(ft
3
). See
Operation:
Understanding Bulk Density
.
✐
NOTE:
Nuisance alarms may
trigger if the selected RTD
position is too close to the
alarm set point. In this case,
the operator would either sim-
ply select a lower RTD or
adjust the alarm set point
lower within the alarm band.
✐
After the RTD monitoring position is selected
and entered into the control:
The drying monitor automatically sets the
temperature offset. (This is the upper limit
for the alarm set point band).
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...
