ka yd en
. c o m
8
Introd
uction
CLASSIC 800 Product Manual
III. THERMAL SIGNAL
The CLASSIC 800 senses changes to the temperature differential as changes occur in the process. The
“v
alue” being sensed and displayed as the Thermal Signal is the rate of thermal dispersion. Assuming the
added energy from the heater is a constant, the formula that determines the Thermal Signal has only two
v
ariables:
1
)
The thermal conductivity of the process media, and
2)
The velocity of the process media past the sensor.
The relationship between Thermal Signal and v
elocity is non-linear. When one of these v
ariables is constant
in a giv
en application, the v
alue of the other v
ariable can be monitored by the CLASSIC. The Thermal
Signal Bar Graph displays Flow & Lev
el as a percentage of the switch/transmitter’s full scale capability.
Figure 2 below illustrates the
Thermal Signal
LED indicators mov
ing to the right as process v
elocity
increases. Assuming a constant heater power and a consistent process media, as the v
elocity of the
process increases so does the
Thermal Signal
, represented by mov
ement of the illuminated LED to the
right.
For example, if the left-most LED is illuminated on the
Thermal Signal Bar Graph
, then a minimum amount
of heat is being carried away by the process based on the current settings. If the right-most LED is
illuminated on the
Thermal Signal Bar Graph
this indicates the maximum amount of heat is being carried
away by the process based on the current settings.
Figure 2 – How Thermal Conductivity is Displayed
Thermal Signal
1 00%
0
Relay 1
Relay 2
Fault
Set Point 1
Set Point 2
Run Mode
Bypass
RUN
SET
1
2
CLASSIC
™
Thermal Signal
1 00%
0
Relay 1
Relay 2
Fault
Set Point 1
Set Point 2
Run Mode
Bypass
RUN
SET
1
2
CLASSIC
™
Thermal Signal
1 00%
0
Relay 1
Relay 2
Fault
Set Point 1
Set Point 2
Run Mode
Bypass
RUN
SET
1
2
CLASSIC
™
No Flow or Dry (Level)
Maximum Flow or Wet (Level)
Increasing Flow
- no flow or flow is far below
Set Point
- lev
el of process is below
sensor
- lev
el of process is abov
e
sensor
- flow is increasing
- flow is at maximum v
elocity &
abov
e Set Point
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Содержание CLASSIC 800 Series
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