REID VAPOR PRESSURE APPARATUS.

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.

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.

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.