MAINTENANCE
OF CLASSIFIED PARTS
According to regulations, the following operations must
only be carried out by:
1 Experienced Siemens maintenance specialists on
the user’s premises
2 User’s maintenance personnel with assessment by
authorized inspector according to regulations
3
SIEMENS
factory according to manufacturing
diagram
4 Factory of respective manufacturer
WARNING:
The regulations must be observed during
maintenance and repairs! According to the
regulations for maintenance on components
relevant to the explosion protection, work is
only permissible in line with the table below.
Part
Adjustment Replacement
Upgrading
Repair Limitations
Notes
Purging time monitoring equipment 1 2 4 1 2 4
Classified solenoid valves 1 2 (1) (2) (Clean valve)
Restrictors for protective gas 3 1 2 3
Heater for oven, FDV, line 1 2
Temperature limiter 1 2 3+4 1 2
Temperature class, modify limiter type (1) (2) 3 (Advice from 3)
Diaphragm valve Permissible
temperature ≤ 160 °C
TCD 1 2 3
FID 1 2 1 2
Methanizer (1) 2 3 (w. expert’s opinion)
Window, electronics door lock 1 2
Classified cable gland,
Cassified terminals
12
Purging hose for protective gas 1 2 1 2
Gaskets for pressurized inclosure 1 2
Fuses for classified solenoid valves 1 2
Isolating relay: Modex, line contactor 1 2
Isolating amplifier 1 2 4
Numbers in brackets refer to notes in brackets.
Explosion protection
1EXPLO.CHP, Stand Dezember 22, 1999
11
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