AR 2000 Operator's Manual
54
Cleaning the Filter Regulator Assembly
The air bearing requires a very clean supply of air regulated to a stable pressure of between 25 to 40 psi, depen-
dent upon the air bearing. The filter regulator assembly is an important part of your rheometer system. It is
designed to meet the required standards of cleanliness (99.9999% of particles above 0.01 mm retained) and
regulation, given that the source of air is dry and pre-filtered.
The maximum inlet pressure is 147 psi (10 bar). The maximum pressure to the rheometer is 42 psi (3 bar).
The filter regulator assembly is shown schematically in Figure 5.27.
Figure 5.27
The Filter Regulator Assembly
If you use the filter regulator, you will need to check routinely (i.e., at least monthly) for any signs of contamina-
tion (i.e., water, oil or dirt) collecting in the filter bowls. If you see a build up of water, follow these steps:
1. Turn off the air supply and disconnect the assembly from the rheometer. Remember to put the airline plug
into the back of the rheometer.
2. Unscrew the filter bowl plug and dry the inside thoroughly.
3. Replace the plug and purge with air before reconnecting to the rheometer. The filter elements must also be
replaced when there is a visible buildup of dirt.
From air
supply
Filter bowls
containing
filter elements
Pressure
Gauge
To Rheometer
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