Correcting Acid Level Detection Issues

• Reliable and repeatable level detection is critical for preventing contamination in processes, both upstream and downstream.
• Acid must not flow into the process except when necessary as a chemical additive.
• The simple yet effective design of the Kayden CLASSIC 800 Series accurately monitors acid levels while not being subject to drift, seizing, or requiring calibration.

A customer uses a thermal switch and gap switch in an application, but faces issues controlling acid levels in the process. They decide to give Kayden a try, which solves issues that they were experiencing:

• The Kayden CLASSIC 800 Series for level detection allows users to ultimate process control. It offers independent and incremental adjustment of heat, range, and (relay) setpoints. Thus, it achieves high sensitivity and fast response to changes in the media level.
• Previously, acid would literally eat through the sensors and enter the electronics’ enclosures, causing failure. However, all Kayden sensors feature welds (not brazes). All flanged sensors have welds on the front and back to resist failures from corrosion and vibration. For example, this unit requires a 3/4″ Monel alloy flanged sensor).

For a level switch to perform well in this application it must resist failures from:

• corrosion and/or sludging damage to the sensor
• temperature extremes – depending upon location and operation, the instrument will see high temperatures (for example: steam)
• water contamination – feed water and cooling water often contains sediment and high mineral content
• electromagnetic interference

Kayden CLASSIC 800 Series for Repeatable and Accurate Level Detection

The Kayden CLASSIC 800 Series Thermal Dispersion Flow, Level, Interface Temperature Switch provides critical control for acid additive level detection. The switch is set to activate or deactivate the feed valve. This can occur directly or, as in this case, through a master control system that uses either independent relay contact or 4-20 mA analog output.

Operators often overlook the Kayden CLASSIC for level detection applications in favor of more complicated and expensive technologies. However, Kayden thermal dispersion switches provide digital repeatability and fast response in a rugged package. Furthermore, it’s not bothered by coating on the probe and will not drift, seize, or ever require calibration.

The user-friendly controls on the LED display of the Kayden CLASSIC 800 Series makes setup fast and easy. Unlike float, paddle, or gap switches, Kayden switches for level detection feature all-welded sensors, a no-moving parts design, true digital electronics with auto-diagnostic functions, two independent relay timers, a bypass timer for auto pump restart, simultaneous process temperature monitor, and a 4-20 mA analog output corresponding to the process level (flow).