Operating Instructions - TM-5-6640-213-140044

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.

Performance data are as follows:

Weighing capacity:

Weighing range . . . . . . . . . . . . . . . . . . . .

100 g

Taring in optical range . . . . . . . . . . .

Total

101 g

Taring ranges:

Manual tare range (optional) . . . . . .

50 g

Mechanical taring (max. with

100 g

built-in weights) . . . . . . . . . . . . . . . .

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

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