440T-AIPB30

The key exchange unit (KEX) 440T-AIPB30 is used in an interlocking sequence to link together other devices in the Prosafe range and caters to more complex operating sequences.

The operating principle of 440T-AIPB30 is such that no secondary keys can be removed from the unit until all primary keys have been inserted, rotated, and trapped. The primary keys remain trapped until all secondary keys have been re-inserted, rotated, and trapped.

440T-AIPB30 is typically used in applications where there is more than one  access way to the hazardous area, and each access way must be open at the same time. The key exchange unit 440T-AIPB30 accomplishes this by allowing one or more keys to be inserted which then releases multiple keys out.

A typical process may require a rotary key switch to turn a motor off. The key from the rotary switch is removed and inserted into a KEX. The KEX 440T-AIPB30 then releases three keys which would allow simultaneous access to the hazard area through three different gates. This KEX 440T-AIPB30 is described as 1 key in 3 keys out. The keys in are considered primary codes, so the keys are not included in the KEX 440T-AIPB30. The keys out are considered secondary codes, so the keys are included.