MIL-DTL-2212K(SH)
TABLE II. Range for pressure switches. 1/, 8/
Maximum proof
Maximum
Adjustment
pressure 2/ (pound
allowable variation
Optimum
Connection for
Designator
operating/working
per square inch
from setting
differential
pressure supply
pressure range 1/
[PSI])
(plus or minus)
6/
4/, 5/, 7/
3/
1
15 to 28 inches mercury
5
1 to 15 lb/in2
6/
4/, 5/, 7/
3/
2
80
15 to 50 lb/in2
6/
4/, 5/, 7/
3/
3
125
50 to 150 lb/in2
6/
4/, 5/, 7/
3/
4
200
100 to 300 lb/in2
6/
4/, 5/, 7/
3/
5
400
300 to 900 lb/in2
6/
4/, 5/, 7/
3/
6
900
500 to 1500 lb/in2
6/
4/, 5/, 7/
3/
7
2000
1000 to 5000 lb/in2
6/
4/, 5/, 7/
3/
8
5100
9
Special (other than a standard range)
NOTES:
1/
Unless otherwise specified (see 6.2), for pressure switches, the ranges to be specified are the operating pressure
range and the resetting differential are relative to gauge pressure.
2/
Unless otherwise specified (see 6.2), is in gauge pressure.
3/
Unless otherwise specified (see 6.2), type of connection shall be in accordance with 804-1385850 that is, a
mechanical threaded connection. Straight threads shall be standard for all new construction.
4/
Manufacturer's name and part number shall be given on the identification plate by which to obtain from
manufacturer all the information for which headings are given in this table.
5/
Shall be as specified (see 6.2).
6/
Repeatability of all switches shall be within 1 percent of the maximum proof pressure (see 6.8.46) for all
switches rated for 200 PSI and above and within 0.5 percent of the maximum proof pressure for all others.
Repeatability, plus operator error, plus gauge error equals maximum allowable variation from setting
(tolerance).
7/
Differentials (make or break) will vary widely due to applications. Switch capabilities shall be as specified
(see 6.2).
8/
If required, ambient pressure compensation (absolute pressure switch) shall be as specified (see 6.2).
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