Application Note

Every Kayden CLASSIC 800 SERIES Thermal Dispersion Flow, Level, Interface & Temperature Switch is configurable by the user for flow, level, interface and/or temperature with air, gases, liquids or slurries. The digital electronics are configured by the user for each application and are 100% interchangeable.

• Unlike float, paddle or gap switches Kayden switches are built specifically for demanding applications in remote locations and harsh conditions while providing remote user access.
  • Easy, front panel controls and an LED display make set up fast and easy.
  • No-moving-parts design and all-welded sensors eliminate drift and sensor failures.
  • Digital electronics provide precise adjustment and optimum repeatability. No calibration is required.
  • Automatic, continuous self-diagnostics with auto-alarm function.
• The Kayden CLASSIC 800 switch may be set to alarm via either of the two (2) independent relay contacts and / or a 4-20mA analog output, on flow (or increasing) or no-flow (decreasing).
• The heater power, range limits, and relay set point(s) are independently and incrementally configured and may be quickly and easily adjusted via the front panel push buttons (no trim pots!). This allows the CLASSIC 800 Series switch to achieve application-specific response response times and to eliminate “nuisance alarms”.

The Start-Up Bypass Timer makes it possible to disable the pump on low flow and have it restart automatically after a predetermined time.

• The Start-Up Bypass Timer allows users to set the delay from 0 to 100 seconds, in 5 second increments.
• The Start-Up Bypass Timer is a programmable feature of Kayden’s digital electronics and as such requires no additional wiring or hardware.
• In the event of a power interruption the Start-Up Bypass Timer will automatically re-start the pump as desired at power-on or restart.
• During the Bypass Delay both relays are energized regardless of their mode or the value of the Thermal Signal.

Figure 2 illustrates a Kayden flow, level, interface and interface switch with a 4” ‘U’ installed in a 6” pipe in a typical top-mount pipe installation. It is extremely important to remember two (2) factors when determining the correct ‘U’ length:

• The dimension of the weldolet (1” in this example) must be added to the diameter of the pipe to correctly size the ‘U’ length of the flow switch. In this case the 4” ‘U’ probe will be in the center of the 6” pipe with the 1” weldolet.
• If the pipe may have flow, but not be completely full, the probe must extend far enough into the pipe that the sensors are immersed.