TB 9-6685-316-50
(5) Apply pressure to equipment setup, using handpump while slowly rotating
weights clockwise until one or both units are floating. Monitor nominal pressure, using
pressure gage indication. (Nominal pressure is 105 psi.)
(6) Balance will be obtained when weights are rotating clockwise on one or both
units with bottom surface of weight table 1/4 inch above either the TI or standard
cylinder housing.
(7) If the standard is floating, place a 1/8 and 1/32 oz weight from avoirdupois
weight set (A2) on the standard. If the TI weight table is floating, place a 1/16 and a 1/32
oz weight on the TI weight table. If the table to which weight has been added falls and
the other rises the TI is within tolerance. If the opposite table does not rise, the TI is
not within tolerance.
(8) Replace the TI 100-psi weight with a different 100-psi weight without
replacing the standard 100-psi weight. Repeat steps (4) through (7) above. Repeat this
procedure until each TI 100-psi weight has been checked.
(9) Repeat the above technique for each TI weight as indicated in table 10. The
gravity compensation weight of column 1 of table 10 should replace the weight specified
in (4) above.
Low-Range Piston Calibration
Test instrument
Standard
Weights to
Calibration
Gravity
place on test
Calibration weight
Weights to place
weight
COMPENSATION
instrument
(added mass)
on (standard)
(added mass)
WEIGHT (OZ)
(psi)
(oz)
(psi)
(oz)
0.048
100
1/16 and 1/32
100
1/8 and 1/32
0.020
40
1/32 and 1/64
two 20
1/16
0.011
20
1/64
20
1/32
0.016
One 201 and one 10
1/32
One 20 and two 5
1/32 and 1/64
0.014
One 201 and one 5
1/32
One 20 and one 5
1/32 and 1/64
1Weight
not replaced for calibration using smaller weights.
(10) Replace the standard 0-600 psi pressure gage with the 0-5000 psi pressure
gage
(11) Remove all weights from the standard and TI weight tables. Place eighteen
100-psi -weights an the standard and TI weight tables (nominal pressure 1805 psi).
(12) Place 53/64 oz of weight on the TI to compensate for different design gravities.
(13) If the standard if floating, place 27/8 oz of weight from the avoirdupois weight
set (A2) on the standard. If the TI weight table if floating, place 1 oz of weight on the TI
weight table. If the table to which weight has been added falls and the other rises, the
TI is within tolerance. If the opposite table does not rise, the TI is not within tolerance.
(14) Replace the low-range piston with the high-range piston in the TI and
standard, and install the 0600 psi pressure gage.
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