MIL-DTL-2212K(SH)
TABLE IV. Range for temperature switches - Continued.
Maximum
Maximum
Operating
allowable
proof
Optimum
temperature
Designator
temperature 1/
variation from
differential
range (°F)
(°F)
setting (°F)
4/
2/, 3/, 5/
11
375 to 480
500
12
Special (other than a standard range)
NOTES:
1/
Maximum proof temperature is temperature at which the performance in the operating
range will not be disturbed and shall exceed the maximum operating temperature.
2/
The manufacturer's name and part number shall be given on the identification plate by
which to obtain from the manufacturer all the information for which headings are given
in this table.
3/
Shall be as specified (see 6.2).
4/
Repeatability of switches shall be within ±0.5 °F at the top of a range and ±1.5 °F at the
bottom of a range, assuming controlled test conditions at a temperature change rate of
1 °F per minute in liquid with standard switch construction. Optional construction for
applications will affect repeatability. Switches with optional construction shall have a
repeatability within ±2 °F at the top of a range and ±5 °F at the bottom of a range in most
cases. Switches with optional construction shall be marked with their repeatabilities.
Repeatability, plus operator error, plus gauge error equals maximum allowable variation
from setting (tolerance).
5/
Differentials (make or break) will vary widely due to applications. Switch capabilities
shall be as specified (see 6.2).
3.16.6.3 Mechanical limit switches. Where practical, the switch assemblies utilized shall be in accordance with
MIL-PRF-8805. Operational and design characteristics shall be as specified (see 6.2) and shall include:
a.
Actuation configuration (roller, plunger, rod, lever, linkage, and so forth).
b.
Operating force in pounds (lbs) or torque in inch-pounds (in/lbs).
c.
Operator travel to actuate switch (inches or degrees).
d.
Total operator travel (inches or degrees).
e.
Operator reset travel (inches or degrees).
f.
Electrical rating.
3.16.6.4 Solid-state proximity switches. Solid-state proximity switches (see 6.8.93) shall conform to
MIL-PRF-24711. Operational and design characteristics shall be as specified (see 6.2) and shall include:
a.
Operating principle (inductive, hall effect, reed, and so forth).
b.
Target description (ferrous metal, nonferrous metal, magnet, and so forth).
c.
Target dimensions.
d.
Sensing range (inches) and characteristic operational curve for slide-by and head-on modes.
e.
Output switch type (electromechanical relay or solid-state switch).
f. Input and output electrical characteristics (see 6.8.36). Solid-state output switches data shall include
leakage current, voltage drop, and all restrictive data.
3.16.6.5 Solid-state photoelectric switches. Solid-state photoelectric switches shall be of the modulated Light
Emitting Diode (LED) operational configuration and shall conform to this specification. Operational and design
characteristics shall be as specified (see 6.2) and shall include:
a.
Operational mode (light or dark operated or selectable).
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