Filter selection for air monitoring applications depends on the contaminant. Pore size, filter compatibility, and analytical method all play a part in filter choice. Our filters display high particle-collection efficiency over a broad range of particle sizes. We offer a variety of filter materials in various filter diameters and pore sizes to fit each specific application.

Cellulose (Mixed Cellulose Ester)

Glass Fiber

Polycarbonate (PC)

Polyvinyl Chloride (PVC)

Polytetrafluoroethylene (PTFE)

Quartz Fiber

Support Pads

Orifices and Filter Holders

You can use different types of filters for fluid particle monitoring: membrane filters and depth filters.

• The membrane filter is a uniform, continuous mesh of polymeric material with defined pore size. These filters are available in various materials. The material type you use depends on its compatibility with the fluid you need to sample.
• Depth filters have a matrix of randomly oriented fibers pressed, wound, or bonded together into a random matrix of flow channels. Unlike membrane filters, depth filters have a nominal pore size, causing the filter to retain a range of particles during initial use. Due to the random orientation of fibers, depth filters do become saturated and eventually the pores become larger with use. Therefore, we recommend you use them for prefiltration or as a support pad in many of the monitoring procedures.

Factors such as the size of the particles, fluid/filter compatibility, and the filtration method determine which filter you should use.

MCE (Mixed Cellulose Ester)

Polytetrafluoroethylene (PTFE)

Quartz Fiber

Support Pads

We offer filter holders, chemical duty pumps, forceps, and Petri dishes for fluid monitoring.

• Due to their inert nature and broad chemical resistance, borosilicate glass filter holders are commonly used for research and small-scale filtrations.
• Stainless steel filter holders feature corrosion resistance, strength, and resistance to bacterial adherence. Due to these advantages, stainless steel filter holders are most commonly used in industrial applications requiring pressure or high-pressure filtration.

Filter Holders and Accessories

Chemical Duty Pumps

Forceps

Petri Dishes

The Fluid Sampling Kit allows sampling of liquids from pressurized systems through contamination analysis cassettes, for gravimetric or colorimetric determination of contaminant level. The stainless sampler assembly, containing a cassette, is plugged into a quick-release valve installed in the system line, and a measured quantity of liquid is allowed to pass through the cassette filter. Residual liquid is then removed from the cassette by using a valved syringe as a pump. For the gravimetric analysis, Matched-Weight Monitors (available as accessories) remove the need for pre-weighing filters before sampling.

Applications: Contamination analysis of aviation fuels, fluid storage tanks, cooling tanks.

The Patch Test Kit allows rapid monitoring of the degree of particulate contamination in hydrocarbon-based hydraulic fluids and lubricating oils. This is accomplished by observing the degree of discoloration of a 5 μm 47 mm disc filter through which a standard volume of the test liquid has been drawn by vacuum filtration. A membrane filter color rating scale and particle assessment scale corresponding to recognized standard levels of contamination is provided for comparison in determining observed contamination levels. Test results are dependably repeatable and sensitive enough to detect any significant change in cleanliness. Free water will appear either as droplets during the test procedure, or as a stain on the test filter. Filters are included for 100 tests.

Applications

Contamination analysis of hydrocarbon-based hydraulic fluids, lubricating oils, bulk chemicals.

• Patch-testing hydraulic fluids
• Contamination testing of lubricants
• Purging fluid
• Particulate contamination in boiler water