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7. Maintenance
7.1 Safety instructions
Warning
Cleaning and maintenance must only be carried out by
authorised and qualified staff.
Shut down the whole system before any work at the sys-
tem components and lines!
The system must be pressureless!
Wear the stipulated personal protective equipment (pro-
tective clothing, goggles, respirator etc.) when handling
chemicals!
Observe the chemical manufacturer's safety data sheets
(MSDS) and safety instructions of the used chemicals!
Safety installations, which have been disabled during
maintenance, must be enabled again immediately after
maintenance.
7.2 Cleaning
If necessary, clean all product surfaces with a dry and clean cloth.
7.3 Regular maintenance
The tightness of the whole system must be checked monthly.
Related information
5.2 Checking the tightness
7.4 Maintenance interval
Maintenance should be carried out at least every two years, or in
case of malfunction. During maintenance, the parts included in the
spare parts set are replaced. The intervals for replacement depend
on different factors, such as flow rate, operating time, pollution and
ambient temperature.
Related information
7.6.1 Spare parts set
7.5 Perform maintenance
This section describes the replacement of the parts included in the
spare parts set. For details on the spare parts set, see section .
7.5.1 Dismantling
Clean removed parts thoroughly with warm water immedi-
Caution
ately after dismantling.
1. Shut down the whole system and make sure, that no residual
gas is in the system and lines.
2. Disconnect the vacuum change-over device from the inlet and
outlet lines.
3. Dismantle the inlet connections and the outlet connection.
The following steps refer to fig. Dismantling the indication
body, part 1.
4. Remove thrust collar (1) using an appropriate face spanner.
5. Remove glass (2).
6. If the optional indication body with signal transmitter (B) is
mounted:
• Disconnect electrical connection at control panel.
• Remove fixing screw (6).
• Remove transmitter body (4). Make sure, that the cable is not
damaged.
• Unscrew and remove magnet pin (5).
10
A
51.3
Dismantling the indication body, part 1
The following steps refer to fig. Dismantling the indication
body, part 2 and Dismantling the indication body, part 3.
7. Push down the indication body (8) against the spring pressure
and remove the four screws (7).
8. Remove indication body (8).
9. Remove the spring bushing (10) and the spring (51.7).
10. Remove nuts (9) and remove the foot.
• Don't pull out the bolts.
7
Dismantling the indication body, part 2
51.7
10
Dismantling the indication body, part 3
The following steps refer to fig. Dismantling the enclosure.
11. Remove enclosure part (13) together with inner parts (14).
12. Remove inner parts (14) from enclosure part (13).
13. Remove middle part (15) and diaphragm body (16).
B
1
2
4
5
6
29.5
8
51.3
9
51.8
8
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