Kayden's Patented Designs provide the ultimate performance and
features package for thermal flow and level sensing. In addition to advanced
process control, Kayden products are designed with many diagnostic features to
meet and exceed safety standards.
Advanced Diagnostics
Kayden's CLASSIC, for example, uses an advanced microcomputer to perform
continuous self-test diagnostics on the electronics and the sensor elements.
Any open or shorted connection will result in an error indication that also
opens all output contacts and disables the heater circuitry. An internal
watchdog circuit ensures that the microcomputer code is performing as expected
and a secondary external watchdog circuit ensures that the microcomputer itself
is functioning. Both circuits can force the contacts open, illuminate the fault
LED and force the heater off. This prevents any possibility of the heater
running out-of-control resulting in excessive temperatures on the probe or a
burnt out heater. In addition, the CLASSIC microcomputer utilizes a CPA
(constant power anemometer design) but modifies the "constant power" of the
heater to prevent extreme conditions.
Intelligent User Controls
The Kayden CLASSIC Display Panel features very bright daylight-visible LED
indicators for easy reading even in direct sunlight. Features made possible by
the advanced electronics include three field-selectable full-scale ranges for
higher resolution in addition to selecting the upper and lower limits of the
scalable 21 LED thermal signal bar graph. The relay-energized modes are
adjustable for each individual relay for proper failsafe installations
depending on the application and desired alarm state. Each relay responds to an
adjustable thermal setpoint or may be set instead to respond to temperature
making it possible to run two flow setpoints, one flow and one temperature
setpoint, or two temperature setpoints all in one product.
An adjustable power-on bypass delay timer is accessible from the Display Panel
for low flow alarm pump protection applications. This makes it possible to
disable a pump on low flow but have it automatically restart in the event of a
power interruption. The CLASSIC's 4-20 mA loop output is a representation of
the data displayed by the thermal signal bar graph display but is field
adjustable for forward or reverse orientation as well as the loop fault values
for failsafe monitoring of the loop. Four adjustable set point delay timers
help eliminate the need for external controls for applications that require an
action to be performed but only after a constant alarm for a set period of
time. An example would be a low flow pump shut-off that turns off a dry pump
but only if it has been dry for several minutes.
The CLASSIC RCMS (Remote Communications and Monitoring Software) allows all
these settings and more to be configured remotely during commissioning and
saved as a file or printed for future reference. Using the Kayden RCMS for
commissioning even gives you the option of locking the Display Panel controls
to eliminate operator adjustments in the field without first unlocking the
Display Panel remotely.
Choices, Not Options
Kayden electronic modules and sensors provide choices, not options. Other
products may boast about a wide variety of input power options, such as 115 AC,
230 AC, 24 DC but fail to point out that the option must be specified at time
of order. On the Kayden CLASSIC these are choices since all listed AC and DC
input voltages are available at all times. Some manufacturers require all
options such as relay-energized mode to be specified at time of order but with
the CLASSIC a few button pushes selects your choice of operation modes.
Select Your Perferred Output
If a product is to be extremely flexible it must also have a way of
communicating its operation in different ways. The Kayden CLASSIC features not
only the traditional dry output contacts of a switch but two sets of contacts
configurable in different modes, an isolated loop-powered 4-20 mA current loop
for remote monitoring of the thermal signal and RS-485 multipoint MODBUS remote
communications. For applications controlled by a PLC (programmable logic
controller), multiple Kayden units can be connected to the same communications
bus and monitored simultaneously.
Advanced Manufacturing
The design team at Kayden truly understands the phrase "design for
manufacturing." The design engineers at Kayden stay with a project right from
conception to field support with end users. One of the design guidelines
implemented at Kayden is "No Jumpers." This eliminates the need for crawling
around on your knees with a flashlight trying to find that little black jumper
you almost held on to. All the configuration options on all Kayden products are
recorded either by miniature mechanical switches or in non-volatile memory. No
loose parts! The output relays are always in vacuum-sealed plastic enclosures,
no open frame relays where corrosive elements can deteriorate contacts. All
printed circuit boards are either encased in a suitable epoxy or coated with
conformal coating to prevent components or leads from being affected by
corrosive elements. Larger components include extra bonding and adhesives to
combat vibration caused failures. State of the art components and component
packaging are used to aid in fully automated Surface Mount Technology assembly.
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