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TM 5-6640-213-14
After a sample has been placed on the pan, weight is removed mechan-
ically until the system is in equilibrium.  Always check balance zero
before each use.
6.  The analytical balance is equipped with an
ionizer near the weighing pan.  It is used to dissipate static elec-
tricity by emitting alpha radiation.  Polonium 210 is used as a radi-
ation source; it is toxic and the following precautions should be
taken to prevent ingestion or inhalation of the solid material:
Do not allow unauthorized personnel near the
ionizer.
When the ionizer is no longer effective as a static
eliminator and its use is to be discontinued, dis-
pose of it as hazardous radioactive material. Do
not discard it as scrap because the small quantity
of remaining radioactive substance could be a poten-
tial hazard if it is mishandled.
Sulfuric acid should not be stored with organic
compounds.  It is a strong oxidant and could cause
fire if breakage occurred.
7.
Performance data are as follows:
Weighing  capacity:
Weighing range . . . . . . . . . . . . . . . . . . . .
100 g
Taring in optical range . . . . . . . . . . .
lg
Total
101 g
Taring  ranges:
Manual  tare  range  (optional)  . . . . . .
50 g
Mechanical  taring  (max.  with
100 g
built-in weights) . . . . . . . . . . . . . . . .
lg
Optical range . . . . . . . . . . . . . . . . . . . .
10 mg
One optical division . . . . . . . . . . . . . .
One  micrometer  precision  (standard
deviation)  division  (digital
readability) . . . . . . . . . . . . . . . . . . . . .
0.1 mg + 0.5 mg or -0.05 mg
Accuracy in optical range . . . . . . . . .
+0.05 or -0.05 mg
Preweighing range, direct . . . . . . . . .
0-100 g
(b) Operating Instructions. Specific instructions
for uncrating the analytical balance, preparing it for use, and
calibrating and making sensitivity adjustmnets are given in Chapter
3.  Operating procedures are given below.
1.  To weigh a sample of unknown weight, use the
weight control knobs (7, fig. 2-6) to return the macroweight counter
(6) to zero and use the micrometer drum knob (3) to zero and micro-
meter line on the optical scale (5).  Then move the arresting lever
2-20

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