The DA 102 mine unit series consisted of eight combination pressure-acoustic firing mechanisms developed under the direction of the Luftwaffe.

The DA 102 is a combination pressure-acoustic unit which was used operationally to-ward the end of the war. Other units in this series are designated DA 112, DA 122, DA 132, DA 142, DA 152, DA 162 and DA 244. None of these latter units was developed to an operational stage. Some attempt at making a pressure-discriminating unit is evident in the early documents on DA 102. The latest attempt appears in the form of the experi-mental DA 244 unit.

The distinguishing characteristic of the DA 102 is that the unit consists primarily of a pressure mechanism with a "permissive" acoustic circuit. The unit is fitted with anti-swell protection. This protection is so positve that the mine will not fire against a target ship during periods of rough weather. The pressure unit is designated D 102 U/UR/KS, and the microphone is known as D 102 M1 (Hasag Mikrophon).

Figure 243 – DA 102 Unit

Figure 244 – DA 102 Unit