ka yd en
. c o m
7
Introd
uction
CLASSIC 800 Product Manual
II. PRINCIPLE OF OPERATION
Kayden sensors incorporate two thin-film platinum Resistance Temperature Detectors (RTDs) and a
separate heater element. The Reference RTD senses the actual process condition (as temperature). Heat is
applied to the Activ
e RTD by the heater element which is controlled by the microprocessor.
The microprocessor makes continuous comparisons between the temperature readings from the Reference
RTD and the Activ
e RTD (v
alues stored as a result of setup programming). As process conditions change,
for example increased v
elocity in a flow application, the Reference RTD “senses” the change and the
microprocessor adjusts the heater and changes the relay state if required.
The CLASSIC 800 can be setup with a narrow range to detect v
ery low flows or v
ery small changes in the
process, or with a wider range to ignore small fluctuations. The CLASSIC 800 series switches and
transmitters are digital dev
ices and will not require calibration. By design they cannot drift or change in any
way unless they suffer physical damage. After correct setup, the CLASSIC 800 will be stable and repeatable
under stable process conditions.
The CLASSIC 800 may be setup in the field by the user for flow, lev
el or interface with air, gases, liquids or
slurries. The CLASSIC 800 may be setup to display process temperature through the RCM Software while
functioning as a flow, lev
el or interface switch/transmitter.
Flow / No Flow
– When the v
elocity of the process media is low or nonexistent, less thermal energy (heat)
is dissipated from the heated sensor. As the v
elocity increases the amount of energy
dissipated by the process media increases, thereby increasing the Thermal Signal.
The Thermal Signal is smallest (left-most LED illuminated) in a no-flow state and
increases (LED moves to the right) as flow increases (see Figure 2).
Liquid Level
– Air and other gases do not dissipate heat as well as liquids. Therefore, the Thermal Signal
is smallest when in a process that does not dissipate heat well (air dissipates heat slower
than water).
The Thermal Signal is smallest (left-most LED illuminated) in a dry, motionless state
and increases as the fluid covers the sensor (see Figure 2).
Liquid Level /
– The CLASSIC 800 can be setup to detect the difference between most liquids if there is
Interface
v
ery little or no v
elocity and each material has a unique thermal property (for example oil
and water in a knockout tank) .
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Summary of Contents for CLASSIC 800 Series
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