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HYDRAULIC CALIBRATOR VERSION
(5)
Continue use of the priming pump until only hydraulic fluid and no air is
expelled from the bleed point .
(6)
Close the bleed point when the priming pump is at the bottom of its stroke
(fully pushed in) and slowly wind out the screw-press to its fullest extent to
draw in further hydraulic fluid (approx. 7cc).
(7)
Switch the instrument ON and, still using the priming pump, pressurise the
system to approximately 2 bar.
(8)
Close the isolation valve and remove the connection to the priming/fluid
inlet port.
Operation
To obtain a pressure reading, proceed as follows.
(1)
Switch the instrument ON and select the required TASK.
(2)
Rotate the screw-press clockwise to increase the applied pressure.
Note: When hydraulic fluid is compressed and flows through a restriction, there is
an increase in temperature which, in turn, has an effect on pressure. Allow
suff icient time for this pressure reading to stabilise before recording or
logging a reading.
(3)
When the test is complete, reduce the pressure in the system to zero by
turning the screw-press anticlockwise. Before disconnection of the UUT,
open the isolation valve to bleed off any residual pressure.
(4)
Remove the connection to the UUT and fit a blanking plug into the
instrument's pressure port. Clean any spilt fluid off the instrument case.
Draining the Hydraulic Fluid
To drain the hydraulic fluid from the instrument, proceed as follows:
(1)
Turn the isolation valve fully anticlockwise. Turn the instrument onto the
left hand side (pressure port nearest to workbench). Place receptacle
below the pressure port to collect hydraulic fluid.
(2)
Drain the system by slowly winding in the screw-press and then
depressing the priming pump plunger to expel any fluid remaining in the
instrument.
(3)
If necessary, apply an air line to the priming fluid inlet to clear any
remaining fluid out of the instrument .
K249 Issue No. 4
48
Operation
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