A small amount of liquid
fluorescent dye is added to a circulating fluid system that is being inspected for leaks. The system is then run for a short time to allow the dye to mix and circulate with the host fluid.

The dye/fluid mixture escapes with the host fluid wherever there is a leak and glows a bright yellow/green when inspected with a high-intensity ultraviolet or UV/blue light lamp. This method is extremely effective in locating even the smallest, most elusive leaks, as well as multiple leaks.

Fluorescent Leak Detection
Applications (open and closed loop)

• Lubrication systems
• Hydraulic systems
• Pipelines
• Air conditioning and refrigeration systems
• Cooling control and hydrostatic pressure systems
• Fuel systems
• Engines

Myths

• Hydraulic systems are supposed to leak
• Dyes cost too much
• Hard to implement in large systems

Benefits

• Fast, easy and accurate
• Finds all leaks—the first time, every time
• Economical
• Reduces labor costs
• Perfect for preventive maintenance
• Environmentally friendly
• Safe
• Improves working conditions
• Decreases equipment downtime
• Increases efficiency of machinery operation

Tech tips

• Tanks often have a separate holding area where the oil is cooled. Therefore, inject the fluorescent dye into the dispensed area to ensure adequate circulation.
• When put into large tanks, the dye should first be diluted with the oil so it quickly mixes.
• When determining dye dosage, always base it on the capacity of the system, including lines and tank. In addition to the tank capacity, there is a significant amount of oil located in the lines.
• Develop a dye service card specific to each application.
• Include leak checking into your regular maintenance program.