Instruction manual, SPT and MPT 31x series transponders

Maintenance
The transponder head is sealed into the housing, using two O-
rings, and is held in position by socked-head stainless steel
(SMO type) screws.
Refer to Figure 26, where an MPT 319/DT-St is used
as an example.
Securing
screws
(Cd4183)
Figure 26 Example of a stainless steel transponder pressure
housing assembly
Opening the unit:
1 Remove the securing screws that secure the transducer
head into the housing.
The EEx models have six securing screws.
The /L-St, /DT-St and /I-St have four securing screws.
Note
DO NOT use a screw-driver or similar tool in an attempt to
lever the end cap out. This will damage the sealing surface.
2 Support the transponder head as it is withdrawn. No tool is
to bee used. Just pull the two sections apart. Once the O-
rings are clear of the housing, the transducer and
electronics chassis may be removed from the housing.
160820/O 75