Fluke Calibration 4322-SYS-NAVAIR, Service Manual

Page: 34 / 186

4322
Service Manual
2-12
Contamination Prevention System
To prevent damage to the Controller from contaminates that can be in the UUT and hoses
such as water, dirt, oil and grease, the Controller is equipped with an integrated
Contamination Prevention System (CPS). The CPS consists of an electronically
controlled vent, a male and female QC fitting, a filter, and a purge port with a 60 ml
plastic waste container (see Figure 2-4). The UUT connects directly to the CPS and does
not require a separate inline connection.
Coarse Coalescing Filter (metal)
TEST Port
(Female QC Fitting)
Access Cover (shown transparent for clarity)
HOSE PURGE Port
(Male QC Fitting)
Plastic Waste
Container
Cap Handle
Fine Coalescing Filter (fiber) -not shown
Control Vent Valve
gxj023.eps
Figure 2-4. Contamination Prevention System (CPS)
During ascending pressure excursions, the controller increases pressure to near the set
point by introducing gas with the compressor (internal supply) or through PV1 fine
control up valve (external supply). Fine pressure is then accomplished using compressor
control or PV1 and PV2 fine control valves. The coarse filter (F2) and coalescing filter
(F3) prevent contamination from the UUT from entering the 4322 control valves and
measurement circuit.
During descending pressure excursions, the Controller decreases pressure to near the set
point by pulsing the control vent valve on the CPS (VH2). In the process of reducing
pressure, contaminants are drawn out of the UUT through the coarse filter (F2). Liquid
contaminates that are not trapped in the filter are purged under pressure through the
control vent valve and into the 60 mL waste container. Fine pressure is then
accomplished using compressor control or PV1 and PV2 fine control valves (see
Figure 2-5).