1. 1823-40    Dwyer differential pressure switch
2. 1831-2-RA-S DPDT   Dwyer low differential pressure switch
3.  1831-1-RA-S   Dwyer  differential pressure switch
4. 1950-20-2F    Dwyer differential pressure switch
5. 1950-02-2S   Dwyer differential pressure controller
6. 1950-00-2F  Dwyer differential pressure controller
7. 1950-0-2F  Dwyer differential pressure controller
8. 1950-1-2F  Dwyer differential pressure controller
9. 1950-5-2F  Dwyer differential pressure controller
10.  1950-10-2F  Dwyer differential pressure controller TAG：