04E3920 User Manual QuickTOC
®
purity
ATEX 2 75
5 Start-up
5.14 Setting the Bypass for the Control Unit
LAR | PROCESS ANALYSERS AG
3. The control unit produces an overpressure of 7 to 10 mbar in the analyser for 10 to 15 minutes to
check the tightness of the pressurized enclosure.
4. After successful verification of the tightness, the overpressure in the analyser is reduced to 2 to
3 mbar.
5.14 Setting the Bypass for the Control Unit
To perform maintenance or repair work, set a bypass for the controller. The analyser can only be opened
when the bypass is set. The bypass can only be adjusted if you are sure that no explosive atmosphere
prevails in the housing. For this a fire protection certificate must be available.
Fig. 49: Activate and deactivate bypass
1. Remove the four cover screws and take the cover off.
2. Follow the instructions in Fig. 49, page 75
3. Put the cover back into place and tighten the cover screws.
Warning
Adjustment of the bypass
The bypass may only be activated if there is no explosive atmosphere in and around
the Ex-p system.
The operator must have an ex-protection authorization.
Warning
Never close the air outlet of the pressurized enclosure system.
!
!
To Next Page
Loading...