Kayden Instruments CLASSIC™ Series Thermal Dispersion Flow, Level, Interface & Temperature Switches & Transmitters

Kayden Instruments

Kayden Instruments is a leading manufacturer of flow, level, interface & temperature products in the process control community.

Their products assist organizations in the global oil and gas, pipeline, power, mining, chemical, transportation, water and wastewater, food, manufacturing, pharmaceutical, plastics, pulp & paper, and semiconductor industries to improve process efficiency.

Features that make their CLASSIC™ 800 standout amongst the competition:

Patented Design

  • Kayden’s patented designs provide the ultimate performance and features package for flow, level, interface, and temperature sensing.
  • Kayden’s products combine precision welded, highly accurate sensors, extremely rugged enclosures, and advanced digital electronics.
  • The CLASSIC 800 Series combines the failure resistance inherent in Thermal Dispersion technology with the performance and features usually reserved for much more expensive instruments.

Universal Power Input

  • Some manufacturers require upfront specifying of all options, such as relay-energized mode, at the time of order. Still, with the Kayden CLASSIC 800 series, you can select your choice of operation modes by simply pushing a few buttons.
  • The universal power input capability of the Kayden CLASSIC 800 series provides flexibility for use in all power input situations.

Discrete & Analog Outputs

  • Modbus registers via RS-485 4-20 mA analog representation of Thermal Signal.
  • Two SPDT sealed relay contacts rated @ 4 amps resistive 230 VAC or 24 VDC maximum.


  • Adjustable Set Point Deadbands
  • 4 Adjustable Independent Switch Point Timers

Advanced Diagnostics

  • Kayden’s CLASSIC 800 series uses an advanced microprocessor to perform continuous self-test diagnostics on the electronics and the sensor elements.
  • Any open or shorted connection will result in a FAULT indication that deactivates all relays and disables the heater circuitry.
  • An internal watchdog circuit ensures that the microprocessor code is performing as expected, and a secondary external watchdog circuit confirms the microprocessor itself is functioning. Both circuits force the contacts open, illuminate the Fault LED, and force the heater off in a malfunction, preventing the possibility of a “run-away” heater or a high thermal offset.

Intelligent User Controls

  • The Kayden CLASSIC 800 series Display Panel features very bright LED indicators for easy viewing even in direct sunlight.
  • An adjustable power-on Start-up Bypass Timer is accessible from the Display Panel for low-flow alarm pump protection applications. This feature makes it possible to disable a pump on low flow and have it automatically restart after a predetermined time in the event of a power interruption.
  • Four adjustable delay timers introduce repeatable time delay into the (setpoint) relay trip function. For example, in a pump protection application, this function will shut down the pump after the switch sensor has gone “dry” for the pre-set time (delay) limit.
  • The Kayden RCM (Remote Communications and Monitoring) Software allows all the settings to be configured remotely and saved as a file, transmitted as an email attachment, and printed for future reference.
  • The Kayden RCM Software includes the option of locking the CLASSIC 800 Series Display Panel to eliminate field adjustments or tampering.
  • Modbus allows multiple Kayden units to be connected to the same communications bus (via RS-485) and monitored simultaneously.

For more information about Kayden in Alabama, Mississippi, Western Tennessee, and Florida, contact Hile Controls of Alabama. Call them at 800-536-0269 or visit their website at https://hilealabama.com.

Combating Droop In Self Contained Pressure Regulators

Combating Droop In Self Contained Pressure Regulators


Sometimes referred to as the ‘Proportional Band’ or ‘Offset’, droop is an inherent characteristic in all self-operated and pilot-operated regulators. Droop is a decrease in outlet pressure from the set value due to an increase in media flow rate.

Download this white paper on combating droop in self-contained pressure regulators. Learn about what you need to consider, what the droop effective is, typical applications, how to reduce droop and how to choose the right valve.

Hile Controls of Alabama