MIL-DTL-2212K(SH)
3.16.6 Switches. Switches shall conform to the applicable specifications MIL-DTL-15291, MIL-S-18396, and
MIL-DTL-21604 or applicable requirements of this specification. Switches shall meet the endurance requirements
of 3.15. Each position of manual switches, other than spring return switches, shall have definite positioning that can
be felt by the operator. Switch identification plates shall clearly indicate each position. Switches shall be mountable
in any position.
3.16.6.1 Pressure switches. Pressure and differential pressure switches shall have the following features:
a.
Pressure switches shall meet the vibration requirements of 3.17.2.3.
b.
Pressure switches shall meet the shock requirements of 3.17.3.3.
c.
Pressure connection shall be 7/16-20, female port, in accordance with SAE J1926/1.
d.
Pressure switches shall be electromechanical unless otherwise approved by NAVSEA.
e.
Electromechanical pressure sensing element (see 6.8.76) to be diaphragm, bellows, or piston types
(bourdon tubes not acceptable).
f.
Pressure ranges and differentials specified by the manufacturer.
g.
Pressure switches shall withstand a pressure of at least three times the maximum operating pressure, but no
longer need to be operational.
h.
When specified (see 6.2), pressure switches shall be supplied with ambient pressure compensation.
3.16.6.1.1 Designations. Designations shall be assigned as specified (see 6.2) and listed in the format below:
Cut In &
Sensing
Pressure
Prefix
-
Type
-
Circuit
-
Range
-
-
-
Voltage
-
Dimension
-
Differential
Element
Switch Range
M2212
-
R
-
A
-
1
-
A
-
A
-
1
-
1
-
1
3.16.6.1.1.1 Type. The pressure switch type shall be designated by the single letter symbol as follows:
R - Pressure, regular
D - Pressure, differential
3.16.6.1.1.2 Circuit. The pressure switch circuit shall be designated by the single letter symbol as follows:
A - S.P.S.T. - single pole, single throw
B - S.P.D.T. - single pole, double throw
C - D.P.S.T. - double pole, single throw (2 normally open [NO] or 2 normally closed [NC] [see 6.8.11])
C' - D.P.S.T. - double pole, single throw (1 NO and 1 NC)
D - D.P.D.T. - double pole, double throw (2 NO and 2 NC and 2 common terminals)
D' - D.P.D.T. - double pole, double throw (4 NC and 2 common terminals)
D'' - D.P.D.T. - double pole, double throw (4 NO and 2 common terminals)
3.16.6.1.1.3 Ranges. Each standard pressure switch range and its maximum pressure shall be specified by the
3.16.6.1.1.4 Cut in and differential. The pressure switch cut in and differential shall be designated by the single
letter symbol as follows:
A - High close
B - High wide
C - Low close
D - Low wide
3.16.6.1.1.5 Sensing element. The pressure switch sensing element shall be one of the following components
depending on the type of operation of the switch:
A - Bellows
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