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RUSKA 2482
Users Manual
28
Note
If the desired differential pressure requires an increment smaller than that
available in the mass set then use the function to adjust the setpoint
value. The desired differential pressure is achieved when the Tared reading
stabilizes to the setpoint value. When finished with this pressure point, use
the function to zero the setpoint in order to obtain the next nominal
differential pressure.
8. Apply the weights for the next differential pressure and wait for a stabilized Tared
reading.
9. When all the differential observations are complete:
a. Select .
b. Remove all the weights.
c. Set the
Gas Isolation Valve
to Equalize.
d. Set the
Oil Isolation Valve
to Equalize.
Zero differential pressure is now applied to the test instrument.
10. Repeat steps 2 through 9 for each line pressure measurement series.
11. When all measurements are complete, reduce the line pressure to ambient by
carefully opening the
Gas Exhaust Metering Valve
. Turn off the motor by
pressing .
Techniques for Extended Calibrations
During an extended calibration series the capacity of the controller may be exceeded.
This will be indicated by the inability of the control system to establish or maintain the
desired differential pressure. When the bar graphs in the Deadweight Controller screen
are at their limits (the top bar greater than 80% and the bottom bar is less than 20%) and
the differential pressure does not come closer to the desired level after several minutes
then the controller capacity has likely been exceeded.
To recover the control capacity:
1. Press .
2. Remove all weights.
3. Turn the
Gas Isolation Valve
to Equalize, then turn the
Oil Isolation Valve
to
Equalize.
4. Wait about 20 minutes before generating further differential pressures. It is not
necessary to remove the line pressure for control capacity recovery.
5. Repeat steps 2 through 9 in the Generating Differential Gas Pressure section.