Differential Pressure Piston Gauge
Operation
23
Differential Measurements Using Dioctyl Sebacate (DOS) Oil
This Section applies when the Test Instrument is tested using DOS hydraulic fluid and is
connected to the Oil test ports of the
RUSKA 2482
.
PID Selection
Verify that the Oil PID option is selected (see Figure 23).
Connecting the Device Under Test (DUT)
Close the
High Side Gas Interface Valve
and
Low Side Gas Interface Valve
.
The Gas system is not required. Close the
Gas Supply Metering Valve
and open the
Gas Exhaust Metering Valve
to de-energize the Gas system.
Set the
Oil Isolation Valve
to Equalize, open the
Pump Isolation Valve
, and open
the
Oil Reservoir Valve
. The system should be at ambient pressure.
Connect the high pressure test port of the DUT to the HIGH SIDE OIL port of the
RUSKA 2482. Connect the low pressure test port of the DUT to the LOW SIDE OIL port.
When making these connections remove only one fitting at a time. This will minimize the
oil loss while making these connections. If both fittings must be removed at the same
time then close the
Oil Isolation Valve
. This will minimize the loss of the DOS oil by
not allowing a flow to be established through the manifold.
W
Warning
All tubing and fitting used to connect the Device Under Test to
the RUSKA 2482 must be rated for safe operation to at least
2975 psi (205 bar).
Purge the air from the interconnect tubing. Put the
Oil Isolation Valve
in Equalize
mode. Open a fitting at the highest elevation where air would be trapped or use the purge
valves built into many differential transducers. Cycle the pump to drive oil into the
system until oil begins to flow through the loose fitting. Tighten all fittings.
If the air has been purged, the turning of the pump handle less than 1/2 turn will result in
a Line Pressure increase. If the pressure does not respond appropriately, then attempt to
further purge the air from the system. Cycling of the Line pressure will force the air into
saturation. Turning on the Motor will help work the air out of the system.
If the
RUSKA 2482
had a major loss of oil, then refer to the Maintenance section for
techniques to fill the system.
Generate Differential Pressures — Hydraulic
1.
Select
to activate the motor rotation. Light will turn green as seen
in Figure 28.
2.
Select
to activate the pressure control bias to increase control
capacity. This will allow the system to stabilize at the pre set bias, refer to the
Software section (Windows | PID Value-Operation Power %). This will take about 15
minutes prior to a calibration sequence to provide the maximum control capacity for
the system. This step may be unnecessary for short calibration cycles.
Summary of Contents for RUSKA 2482
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