MIL-DTL-55023D
within the minimum range indicated in Table I. The manometer shall withstand, without damage
or leakage, an internal pressure not less than 100 pounds per square inch gauge (psig).
Table I. Minimum differential pressure range
Linear inches of indicating
Size
fluid (psig)
1
0 to 30
2
0 to 10
3
0 to 3
4
0 to 7
5
As specified
3.7 Construction. The manometer shall be complete and usable for operation. Type I
shall consist of a frame, clean-out head or tube, graduated scale, and U-tube. The mounting
stand shall be furnished with size 1 manometers. Type II manometers shall include a housing,
reservoir, curved tube, and applicable components of type I manometers.
3.7.1 Frame. The frame shall be metal or plastic. Metal frames shall be corrosion
resistant or have a corrosion-resistant finish. All frames shall have provisions for wall-mounting.
The frame for the size 1 manometers shall permit mounting in the table stand. When a table
stand is required for the style B manometer, the frame shall include provisions for mounting the
stand.
3.7.2 Clean-out head or tube connector. The clean-out head or tube connector shall be
corrosion-resistant steel, and shall be removable without the use of special tools to permit
cleaning and replacing the tube. The head shall have a female pressure connection. The pressure
connection shall be connected to the inlet for tube ends. The clean-out head shall be secured to
the frame by clamp or screw providing an air-tight connection between the head inlet and the
tube end. Tube connectors, if furnished, shall provide and air-tight connection between
indicating tube and connecting tubing.
3.7.3 Tube. The U-tube shall be borosilicate glass or plastic. Unless otherwise specified
(see 6.2), the curved tube shall be cellulose acetate butyrate. The tube shall be free of scratches,
bubbles, and fog to permit an unobstructed view of the indicating fluid level and shall withstand
a minimum internal pressure of 100 psig. The tube shall be removable without the use of special
tools to permit cleaning and replacements. A brush shall be provided for cleaning the tube.
3.7.4 Scale. The scale shall be graduated in linear inches and millimeters and
constructed of corrosion-resistant material. The scale shall be adjustable to align the zero mark
with the fluid level. The scale marking and background shall non-glare, contrasting colors. The
minimum range of the graduated scale for the type, size, and style manometer shall be as
indicated in Table II.
4
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