EN
14522381.01 04/2022 EN/DE/FR/ES
WIKA additional operating instructions for diaphragm seal, model 990.45
7
3.5 Markings
For the operation of each diaphragm seal system, it must be ensured that the permissi-
ble pressure/temperature rating is maintained depending on the components used, their
materials and the system fill fluid. This results in either the maximum process temperature
for the respective process being defined by the maximum allowable pressure PS, or the
maximum process pressure being defined by the maximum permissible temperature TS.
Thus, the pressure-temperature diagram in the data sheet, together with the applicable
standards and Technical information IN 00.25, with respect to the system fill fluid, must be
observed.
Marking
Line
Pos.
Designation
1
1
WIKA
1
2
Serial number
2
1
Diaphragm seal model
Example of
Marking
Line
Pos.
Designation
1
1
Standard of process connection
1
2
Size of the process conn nominal pressure rating
2
1
Material data for upper body of diaphragm seal
3
1
Material data for diaphragm
3
2
Maximum permissible temperature TS
1)
3
3
Maximum allowable pressure PS
1)
1) Per European pressure equipment directive
3. Safety
