MIL-DTL-28788C
6.4.2 For category II switches. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Title, number, and date of the applicable specification sheet.
c.
Military part number of qualified switch.
d.
Manufacturer's part number of modified switch.
e.
Details of the variations from the specification sheet.
f.
Inspection requirements (to verify variations from category I switches) (see 4.5 and notes 1
and 2).
1. Tests to be performed (if any) (see 4.5).
2. The laboratory at which inspection is to be performed (see 4.5).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for
products which are, at the time of award of contract, qualified for inclusion in Qualified Products List
(QPL) whether or not such products have actually been so listed by that date. The attention of the
contractors is called to these requirements, and manufacturers are urged to arrange to have the products
that they propose to offer to the Federal Government tested for qualification in order that they may be
eligible to be awarded contracts or orders for the products covered by this specification. Information
pertaining to qualification of products may be obtained via email to vqp.chief@dla.mil or from the DLA
Land and Maritime, Attn: VQP, 3990 East Broad Street, Columbus, OH 43213-1199. ). An online listing of
products qualified to this specification may be found in the Qualified Products Database (QPD) at
6.4
Definitions.
6.4.1 Enclosure. An enclosure is an auxiliary housing providing protection and means for mounting
and actuating of the basic switch.
6.4.2 Unsealed switch. Unsealed switches are switches with contact areas open to the atmosphere.
6.4.3 Watertight switch. Watertight switches are switches with contact areas sealed to meet the
requirements of 3.21.1.
6.4.4 Hermetic seal. A hermetic seal is one which has been effected by means of fusion of glass or
ceramic to metal, or by bonding of metal to metal, thus providing a completely sealed, gas-tight
enclosure.
6.4.5 Differential pressure. Pressure measured or expressed from some reference other than
absolute zero of ambient atmospheric pressure is called differential pressure.
6.4.6 Proof pressure. The maximum pressure that can be repeatedly applied without causing
rupture, leakage, permanent deformation of parts, calibration shifts, or other damage is called proof
pressure.
6.4.7 Burst pressure. The maximum pressure that can be applied without causing rupture or
leakage, although permanent structural deformation and calibration shifts may result, is called burst
pressure.
6.5 Subject term (key word) listing
Enclosed
Watertight
Hermetic
Pressure
Detecting
Sensor
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