Ametek PK II, Operating Instructions Manual, Page: 20 / 28

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Step 4
Weights may be given a slow rotary motion
to ensure that the weights rotate freely
without abrupt stopping.
(See Section 6.1
to correct for poor weight rotation).
Note: It is not necessary to excessively
spin the weights of the pneumatic
deadweight tester to overcome friction.
Excessive rotation may affect accuracy.
WARNING
Do NOT spin the weights unless the
ceramic ball is floating.
Step 5
Open the tester “ OUTLET ” valve and
calibrate the instrument. Once calibration
is complete, the downstream pressure
may be vented by turning the outlet valve
to the
“ VENT ” position.
CAUTION
The ceramic ball, weight carrier and
weights comprise a “ system ” for
your PK II calibrator and should be
used together to ensure a correct
calibration. Accuracy will be affected
if the ceramic ball, weight carrier and
weights are interchanged.
6.0 OPERATING INSTRUCTIONS (Cont ’ d.)
Slowly rotate the weights to ensure that there are no restrictions
and that the weights float freely.
Open the OUTLET valve to calibrate the instrument. Once the
calibration is completed, you may vent the pressure by rotating
the OUTLET knob to the VENT position.