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Figure 3-8. Tare Ring and Tare Boat.
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TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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Operator Services
TM 5-6640-213-14
(b) Remove the weighing pan from the weighing compart-
ment.  Lift the weight carriage (10, fig. 3-6) and swing the weight
carriage bridle forward to detach it from the stirrup bearing plate.
Unscrew the two large knurled head screws in the ceiling of the
weighing compartment and remove the partition.  Unscrew knurled nuts
(8 and 15, fig. 3-6).  Separate the upper part of the weight carriage
from the lower part; hold the lower part and switch the weight decade
slowly from 9 to 8 to 7, and on down to zero.  While doing this,
remove the corresponding weights, which will be lying freely in their
respective hooks.
(c) Clean the weights thoroughly. Not even finger-
prints should remain on their surface.  Handle weights with forceps
only.
Do not attempt to repair the balance.  Only a
skilled service repairman with factory facilities
available should attempt repairs.  Adjustment and
calibration can be accomplished by the laboratory
technician.
(d) After cleaning, reassemble the balance, check the
zero, and adjust sensitivity, if necessary.
(2) Weighing compartment.
(a) To clean weighing compartment interior, arrest
the balance; remove the weighing pan; and wipe the interior clean,
using a water-damp chamois.  Wring chamois dry and wipe again,
removing all traces of water.  Remove dust particles using camel's
hair brush.
(b) Clean and replace weighing pan. Sliding glass
doors may be removed for cleaning.
(c) Wipe the exterior of tha balance clean, using
water-damp chamois. Do not attempt to clean balance mechanism other
than the weights and knives unless the balance malfunctions.
3-7.
REID VAPOR PRESSURE APPARATUS.
When filling the Reid Vapor Pressure (RVP) Bomb
Bath, exercise extreme caution in adding the re-
quired ten (10) parts per million (ppm) (0.1 ml/
liters) of Copper Sulfate.  Do not exceed this
proportion, as twelve (12) ppm (0.12 ml/liters) of
Copper Sulfate is poisonous.

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