The WSI was developed in conjunction with industry stakeholders and an ASTM method is being developed by the water separation task group fuel cleanliness sub-committee D02.J0.05. The water coalescing property of filter materials is reduced by surfactants which

inhibit the ability of the filter to remove water droplets from the fuel – i.e. wet fuel passing through the filter. The WSI is designed to predict filter coalescer failure. The instrument is fully automatic with simple touch screen operation. The WSI features a patented Sonic Mixing Technology which eliminates any variables with water droplet size and ensures the same amount of energy is applied to each sample.



Filter cartridges use API/EI 1581 5th edition filter material which is less sensitive to weak surfactants and eliminates uncertainty over static disippator additives, but is responsive to the presence of ester based additive.

• Automated Water Separation Index (WSI)
• Measures 50 to 100 WSI
• Analysis time 10 minutes
• 230ml sample volume
• Patented Ultra Sonic Mixer
• API/EI 1581 5th edition filter material
• Suitable for untrained operators
• Fully automatic
• Optional Conductivity Sensor