Figure 2-28. Analytical Balance

TM 5-6640-214-14

Zero control knob

5. Optical scale

Arrestment lever

6. Macro weight scale

7. Weight control knob

Micro scale

Figure 2-28. Analytical Balance.

a. Cleaning

(1) From time to time clean the weights of the balance with a camel's hair brush or chamois leather. To

remove the weights, arrest the beam and take off the hood. Move all knobs to the maximum setting. Remove the

weighing pan from the weighing compartment. Lift the weight carriage and swing the weight carriage bridle forward to

detach it from the bearing (stirrup) plate. Unscrew two large knurled head screws in the ceiling on the weighing

compartment and remove the partition. Unscrew knurled knob (5, fig. 2-30), and knurled nut (4). Separate the upper

part of the weight carriage from the lower, while holding the lower to prevent it from falling into the weighing

compartment. Take out the lower part and switch the weight decade slowly from 9 to 8 to 7, etc., to zero. While doing

this, remove the corresponding weights which will be lying freely in their respective hooks. Clean the weights thoroughly.

Do not leave fingerprints on the surface. Handle weights with forceps only. After cleaning, reassemble the balance

check, zero, calibrate, and adjust sensitivity, if necessary.

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