TM 75053
ML24
Figure 30. Fahrenheit Psychrometer ML24.
1. NOMENCLATURE: Psychrometer ML24.
Dimensions (thermometer tube)
9 3/8 in. long, 7/32 in. out-
side dia.
2. TYPE CLASSIFICATION: Standard A.
Weight
_ _ _ __ _ _ _ _ 1 lb net, 3 lb packed.
3. SECURITY REQUIREMENTS: Unclassified.
7. MAJOR COMPONENT:
Psychrometer ML24.
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
Used to measure temperature and water vapor content
8. SET, SYSTEM, FACILITY, AND CONFIGURATION
of the air.
APPLICATIONS:
This unit is used independently.
5. BRIEF FUNCTIONAL DESCRIPTION:
Psychrometer ML24 consists of two identical mercury-
9. ADDITIONAL EQUIPMENT REQUIRED AND AUX-
in-glass thermometers mounted on a metal frame which
ILIARY EQUIPMENT: None.
is attached to a sling. One of the thermometers (the dry
10. TOOLS AND TEST EQUIPMENT: None.
bulb) is used to measure the temperature of the free air,
and the other (the wet bulb) is used to provide a measure-
11. REFERENCE DATA AND LITERATURE:
ment of the water vapor content of the air. From the wet-
TM 11666022212 _ _ _ _ _ _ _ _ ML24
bulb and dry-bulb readings, the dewpoint, relative humid-
12. REPAIR PARTS SUPPORT CAPABILITY:
ity, and vapor pressure of the atmosphere can be calcu-
lated. In use, the psychrometer is rotated rapidly about an
No density.
axis at right angles to its length, using a hand sling or
13. TRAINING REQUIREMENTS:
Rotor ML74( ).
Operator MOS 93E20, 93F20.
6. TECHNICAL CHARACTERISTICS:
14. TYPICAL BASIS OF ISSUE:
Thermal element _ _ _ _ _ _ _ Mercury.
TOE
Allowance
Temperature range:
6525G _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2
General _ _ _ _ _ _ _ 35 F, to +115 F.
6677G
2
_ _ _ _ _ _ _ _ _ _ _ __ _ _
Tropical _ _ _ _ _ _ _ +10 F. to +145 F.
11500G __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1
Accuracy
_ _ _ _ _ _ 0.4 above 32 F.,
TA
0.6 from 0 F. to
61 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
14
32 F., 8 below 0
3213 __ _ _ _ _ _ _ _ _ _ _ _ _ __ __ _ _
1
F.
50322 __ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _
2
Graduations _ _ _ _ _ _ _ _ Intervals of 1, each
50510 _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _
1
multiple of 10 is
50815 _ _ _ _ _ _ __ _ _ _ _ _ __ __
1
numbered.
50816 _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _
4
Ventilation _ _ _ _ _ _ _ _ Hand sling or Rotor
50826 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2
ML74( ).
50914 _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ __ _
62
75
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