74 Instruction Manual QuickTOC
®
ultra
IECEx 12E5119
5 Start-up
5.15 Setting the Bypass of 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.
5.15 Setting the Bypass of the Control Unit
To perform maintenance or repair work, set a bypass for the control unit. The analyser can only be
opened when the bypass is set. The bypass can only be adjusted if you are sure that there is no
explosive atmosphere in the housing. For this a fire protection certificate must be available.
Activate bypass:
The F870S control unit is operated via the mini-joystick (1) and display (2). The mini joystick (1) can be
moved up and down (↑ ↓) and left or right (← →). Pressing the mini-joystick will take you to the
respective sub-menu on the display (2).
1. Loosen the four screws of the control unit cover and remove the cover.
2. Press the joystick. The display shows "Actions". Confirm by pressing the joystick.
3. Press the joystick downwards (↑ ↓). The display shows "Bypass". Confirm by pressing the joystick.
4. Press the joystick right (→) until you reach the last digit and then upwards (↑) to change the bypass
code.
5. The bypass code to enter is 0002.
6. Press the joystick downwards (↓). The display shows "Bypass ON".
7. Attach the control unit cover with the four screws.
Notice
Never close the air outlet (1) of the pressurized enclosure system.
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