MIL-PRF-8932/2A
5. Sensor matching differential gauge switch. The differential pressure switch with the P2 port
open to the atmospheric pressure, shall have the adjustment set so that the switch actuates when
the pressure applied to the P1 port is less than one-fifth of the normal system pressure (see figures
1 and 2). The switch shall then be subjected to:
a. A pressure shall be applied to the P1 port and the pressures at which the switch actuates
and deactuates shall be recorded. The difference between the two pressure values (operating
differential) shall be within the tolerance specified in table I.
b. A pressure equal to one-fifth of the normal system pressure shall be applied to the P2
port. The test specified in (a) shall be repeated. The differential pressure at which the switch
actuates and deactuates shall not differ from the values noted in (a) by more than the tolerance
specified in table I.
c. The test specified in (b) shall be repeated, with two-fifths of the normal system pressure
substituted for one-fifth of the normal system pressure specified in (b).
d. The test specified in (b) shall be repeated, with three-fifths of the normal system pressure
substituted for one-fifth of the normal system pressure specified in (b).
e. The test specified in (b) shall be repeated, with four-fifths of the normal system pressure
substituted for one-fifth of the normal system pressure specified in (b).
6. Sensor matching differential vacuum switch. Differential pressure switches which operate on
pressure less than atmospheric shall have the adjustment set so that the switch shall actuate at a
differential pressure less than one-fifth of the operating range (see table I).
a. A vacuum with a value less than the highest value specified in table I shall be applied to
the P1 port (see figures 1 and 2). The pressure at which the switch actuates and deactuates shall
be recorded and the operating differential shall be within the tolerance specified in table I.
b. The above test shall be repeated with a vacuum applied to the P2 port (see figures 1
and 2) equal to one-fifth of the highest value specified in table I. The differential pressure at
which actuation occurs shall not differ from the value established in (a) by more than the tolerance
specified in table I.
c. The test specified in (b) shall be repeated with two-fifths of the highest value substituted
for one-fifth of the highest value specified in (b).
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