A-A-52412A
3.4 Configuration. Inclinometers shall be as specified in figure 1.
3.4.1 Indicator. The indicator shall be made of black glass or similar material and be highly
polished.
3.4.2 Tube. The glass tube shall be made of clear annealed glass tubing, free from defects which
may interfere with normal reading of the inclinometer. The inside of the tube shall be smooth
and uniform in order to ensure that the indicator will move smoothly. The tube shall be firmly
secured in the frame. An expansion chamber shall be provided at each end of the tube. The tube
wall thickness shall be as follows:
Type
Wall thickness
I
0.46 inch (in) [11.9 millimeter (mm)] minimum
II
0.39 in (9.9 mm) minimum
3.5 Air bubble visibility. The air bubble shall not be visible when the inclinometer is viewed
from a position 12 in (300 mm) directly in front of the inclinometer zero mark with the
inclinometer inclined to 20° [350 milliradians (mrad)] for type I and 10° (175 mrad) for type II.
3.6 Scale error. Scale error of the inclinometer shall not exceed the tolerance at degrees of
inclination specified in table I.
Table I. Tolerance for degree of inclination.
Inclination
Tolerance
Type I
Type II
Type I
Type II
degrees
(mrad)
degrees
(mrad)
degrees
(mrad)
degrees
(mrad)
0
(0)
0
(0)
1.0
(18)
1.0
(18)
5
(88)
5
(88)
1.5
(26)
1.5
(26)
10
(175)
10
(175)
2.0
(35)
2.0
(35)
15
(263)
-
-
2.5
(44)
-
-
20
(350)
-
-
2.5
(44)
-
-
3.7 Indicator visibility. With the inclinometer tipped in such a manner that the indicator is at
rest at either end of the tube, not less than half of the indicator shall be visible when viewed from
a position 12 in (300 mm) directly in front of the zero mark of the inclinometer.
3.8 Damping. The elapsed time to move the indicator from zero mark to the maximum degree
mark of the inclinometer for type I or type II shall not exceed indicator movement time at
temperatures specified in table II.
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