PAC Alcor JFTOT II Manual page 102

Observe to confirm that the reading is steady.
If not, there is a leak, or there is air in the
system. Tighten all temporary test fittings, and
return to Step 3.12. If the problem persists,
return to Step 3.8.
3.20 Measure and record the height from the
appropriate -∆P port to the level of fuel in the
bottle to the nearest mm.
3.21 Subtract the reading noted earlier (taken at the
zero point) from the reading taken at 400 mm,
making sure any negative signs are considered.
The total will be the ∆P reading difference.
3.22 The theoretical ∆P can be calculated from the
following equation:
(fuel density, gms/ml) (height, mm)
Theoretical ∆ P =
(Hg density) (100% - % bias)
For example, for a fuel of 0.800 gms/ml
density, at a height of 400 mm, and the familiar
JFTOT bias on ∆P of 6%:
(0.800 gms/ml) (400 mm)
Theoretical ∆P=
(13.53) (.94)
If there is a difference between the actual and
theoretical values of greater than about 5%, the
cell may have a problem. First however, the
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system should be checked a second time to be
sure that there is no entrained air that might
alter the standardization value. Return to Step
3.8. Air is the most likely cause of a suspected
calibration drift.
3.23 Press EXIT to return to the MAIN MENU.
3.24 For JFTOT 240 only: Perform a similar test on
the ∆P2 transducer starting with Step 3.8.
Place top FLOW CONTROL VALVE to
RUN, and be sure the spent fuel outlet port and
∆P1+ ports are capped. At the start, attach the
bottle to ∆P2- fitting; later move the bottle line
down to the ∆P2+ fitting. Operate test using
only the bottom FLOW CONTROL VALVE.
3.25 When finished, drain bottle and properly
dispose fuel.
= 25.16mmHg
JFTOT II Calibration Manual Rev. C