Fluke RUSKA 2482, Руководство пользователя, Страница: 33 / 46

Differential Pressure Piston Gauge
Operation
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6. Apply the weights for the next differential point and wait for the Tared Reading to
stabilize.
7. When all differential observations are complete, select or
, remove all the weights, and turn the Oil Isolation Valve to
Equalize. Zero differential pressure is now applied to the DUT.
8. Repeat steps 1 through 7 for each line pressure measurement.
9. When all measurements are complete, turn the Oil Isolation Valve to Equalize,
reduce the line pressure to ambient, select to deactivate the motor
rotation, and select .
Techniques for Extended Calibrations
The procedure outlined in Generating Differential Pressures — Hydraulic, relies on the
Thermal Compensation circuit to control the differential pressure change from one
differential pressure to the next. 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.
Option 1
To recover the control capacity press , remove all weights, turn the Oil
Isolation Valve to Equalize, and wait about 20 minutes before generating further
differential pressures. It is not necessary to remove the line pressure for control capacity
recovery.
Option 2
The control capacity can also be conserved by using the Hand Pump to bring the
differential pressure closer to the zero indication. Before changing the masses to obtain a
new differential pressure, place the controller into , then use the hand
pump to get close to the next Differential pressure. Place the controller back into
.
Differential Measurements Using Compressed Gas
This Section applies when the Test Instrument is tested with compressed gas and is
connected to the GAS test ports of the
RUSKA 2482
. Refer to the specifications for the
requirements for the quality of compressed gas.
PID selection
Verify that the Oil/Gas PID option is selected (see the Software section, Figure 4-13, PID
Values with Control Coefficients).
Verify Gas Supply Connection
Verify the proper installation of the gas supply system (see the Installation section).
Using the Oil/Gas Interfaces
The oil to gas interface windows allow the maintenance of the oil levels in the system.
The oil level can be manipulated with the hand pump.