Rosemount P330, Installation And Operation Manual, Page: 72 / 92

Rosemount Model P330 Pressure Validator
7-4
PRIMING THE SYSTEM Before any measurements can be taken, the hydraulic system needs to
be primed (bled free of air). Figure 7-2 shows the validation and
priming setup. To prime the hydraulic system, follow the steps below:
NOTE
During the following operations, prepare for fluid spillage and provide a
suitable receptacle for collecting the spillage.
1. Prepare for use as detailed in the Connection Procedure on
page 7-3.
2. Fill a suitable container with the required hydraulic fluid.
3. Place the priming inlet assembly hose into the fluid.
4. Open the bleed valve on the transmitter. If possible, fit a hose to
the bleed point and place this hose in a container of the same
fluid.
5. Using the priming pump, pump hydraulic fluid into the validator
and the connected system.
6. Monitor the hydraulic fluid level to ensure that the priming hose
stays below the fluid level so that no air is allowed into the
system.
7. Add to the hydraulic fluid level as necessary to ensure that no air
enters the system.
8. Continue use of the priming pump until no air is expelled from
the bleed point.
9. Close the bleed point when the priming pump is at the bottom of
its stroke (fully pushed in).
10. Slowly wind out the screwpress to its fullest extent to draw in
further hydraulic fluid (approx. 7 cc).
11. Turn on the validator. Still using the priming pump, pressurize
the system to approximately 29.4 psi.
12. Close the isolation valve, and remove the connection to the
priming/fluid inlet port.
VALIDATION PROCEDURE To obtain a pressure reading, proceed as follows:
1. Turn on the validator.
2. Select the required task mode.
3. Rotate the screwpress clockwise to increase the applied pressure.
NOTE
When hydraulic fluid is compressed and flows through a restriction,
there is an increase in temperature that has an effect on pressure.
Allow sufficient time for this pressure reading to stabilize before
recording or logging a reading.
4. When the test is complete, reduce the pressure in the system to
zero by turning the screwpress out (counterclockwise).
5. Before disconnecting the transmitter, open the isolation valve to
bleed off any residual pressure.
6. Disassemble the connection to the transmitter.
7. Fit a blanking plug into the validator pressure port.
8. Clean any spilled fluid off the validator case.
See Safety Messages on page 7-1 for complete warning information.