Product Presentation
The LPA2 is designed to measure and quantify the numbers of solid contaminants in Hydraulic, Lubrication and Transmission
applications. The LPA2 is designed to be a laboratory accurate instrument suitable for “on-site’’ applications utilising hydraulic uid
as the operating medium. Please contact your local sales ofce for other operating uid options.
The instrument uses the light extinction principle whereby two laser light systems shine through the uid and land on photodiodes.
When a particle passes through the beam it reduces the amount of light received by the photodiode, and from this change in
condition, the size of the particle can be deduced.
Hydraulic and Lubricating Systems consists of sets of continuously moving metal parts, which use hydraulic uid as the power
medium. Hydraulic uid is also used to create a lubrication lm to keep the precision parts separated and it is also used as a
cooling medium. The very nature of a hydraulic system is that it produces solid particulate contamination and these are ever
present in all hydraulic systems. There are various standards that quantify/ arrange/tabulate the amount of particle contamination
in specic volumes of uids and it is these levels that the particle counter is designed to measure.
Product features
Moisture sensor
LPA2-W models measure water content using a capacitive RH (relative humidity) sensor. The result is expressed as percentage
saturation. 100% RH corresponds to the point at which free water exists in the uid, i.e. the uid is no longer able to hold the water
in a dissolved solution. This is also normally the point at which signicant damage occurs in a hydraulic system, so is an ideal
measurement scale that is independent of the uid characteristics.
The water saturation point (100% RH) is temperature dependent, so the temperature is measured at the same time. This enables
results to be compared meaningfully.
The temperature measured is that of the uid passing through the unit.
Note: this may differ from that of the hydraulic system, depending on ow rate, pipe length and ambient temperature.
It is not intended to be an accurate indication of system temperature, but to provide a reference for the RH measurement at the
point of sample. Nevertheless, experience has shown the temperature measured is within a few degrees of that of the hydraulic
system, in most applications.
Automatic Particle Counters
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