TM 75053
ML224
Figure 50. Centigrade Psychrometer ML224.
7. MAJOR COMPONENT:
1. NOMENCLATURE: Psychrometer ML224.
Psychrometer ML224.
2. TYPE CLASSIFICATION: Standard A.
8. SET, SYSTEM, FACILITY, AND CONFIGURATION
3. SECURITY REQUIREMENTS: Unclassified.
APPLICATIONS:
This equipment is used as a part of meteorological
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
Station Manual AN/TMQ4( ).
Used to measure temperature and water vapor content
9. ADDITIONAL EQUIPMENT REQUIRED AND AUX-
of the air.
ILIARY EQUIPMENT: None.
5. BRIEF FUNCTIONAL DESCRIPTION:
10. TOOLS AND TEST EQUIPMENT: None.
Psychrometer ML224 consists of two identical mercury-
11. REFERENCE DATA AND LITERATURE:
in-glass thermometers mounted on a metal frame which is
TM 11666022212 _ _ _ _ _ ML224
attached to a sling. The psychrometer is rotated rapidly
TM 11666021812, 25P _ _ _ AN/TMQ4
about one axis at a right angle to its length. One ther-
mometer (the dry bulb) measures the temperature of the
12. REPAIR PARTS SUPPORT CAPABILITY:
free air and the other (the wet bulb) provides measure-
No density.
ment of the water vapor content of the air. From these
13. TRAINING REQUIREMENTS:
readings the dewpoint, relative humidity, and vapor pres-
Operator MOS 93E20, 93F20.
sure of the atmosphere can be calculated.
14. TYPICAL BASIS OF ISSUE:
6. TECHNICAL CHARACTERISTICS:
Allowance
TOE
Thermal element _ _ _ _ _ Mercury-in-glass.
2
6577G _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Temperature range:
TA
General _ _ _ _ _ _ _ _ 37 C. to +46 C.
51101 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
1
Tropical _ _ _ _ _ _ _ _ 12 C. to 63 C.
18
104 _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _
Graduation _ _ _ _ _ _ _ _ _ Intervals of 1 C.; each
8
2 0 3 0 _ _ _ _ __ _ ___ ___ _ __ _
multiple of 10 C. is
2
50731 _ _ _ _ _ _ __ _ _ _ _ __ _ __ _ ___
numbered.
1
50807 __ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _
Accuracy:
1
50813 _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _
Below 18 C _ _ _ _ _ _ 0.4 C.
1
604 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
From 18 to 0C _ _ _ _ _ _ _ 0.3 C.
1
825 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Above 0 C _ _ _ _ _ _ _ _ 0.2 C.
15. PRICE DATA:
Mounting _ _ _ _ _ _ _ _ Metal frame.
a. Major item _ _ _ _ _ _ _ _ _ .50
Ventilation _ _ _ _ _ _ _ _ _ Hand sling or Rotor
b. Repair parts (1-year cost based Expendable, non-
ML74( ).
repairable.
on 100 equipments).
Dimensions (thermometer
16. ITEM REPLACED: None.
tube):
Length _ _ _ _ _ _ _ _ _ 9 3/8 in.
17. REMARKS:
Outside diameter _ _ _ _ 7/32 in.
Issued as a replacement unit.
125
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