Revision 5
107
August 2021
7.3 Testing and Replacement of the Optical Fibres
When a
High Integration Period
warning is present, one of the possible causes of this warning
is that one or both of the optical fibres have been damaged and are not able to transmit
ultraviolet radiation normally. To eliminate or confirm the fibres as the source of the high
integration period, they can be tested as a pair or, if necessary, individually to observe their
transmission characteristics .
The fibre optic cables will generally only require change-out if they suffer from mechanical
damage or if they have been exposed directly to short wavelength ultraviolet radiation for
prolonged time periods, as when the analyzer has been operated for prolonged periods without
anti-solarant solution present.
The fibre optic cable ends terminate into SMA type connectors and are intended to be installed
with the seal body installed in the inter-cabinet seal fittings that connect the oven cabinet and
the control cabinet. There are two cables. The shorter of the two fibres connects the UV Source
Lamp in the control cabinet to the top side of the measurement cell in the oven cabinet. The
longer of the two fibres connects the Spectrometer in the control cabinet to the bottom side of
the measurement cell in the oven cabinet.
The SMA connectors only need to be finger-tight. Do not overtighten the connectors
as this may damage the cable.
Remove the anti-solarant fluid holder and check if the
High Integration Period
warning is still
present when operating without anti-solarant solution BEFORE proceeding with the fibre test
procedure. If the
High Integration Period
warning clears when the anti-solarant fluid holder is
removed, this indicates that the anti-solarant solution has degraded to a non-usable level and
needs to be replaced as per the procedure described in section 6.3. Perform this replacement
prior to testing the optical fibres. To test the optical fibres, and replace if necessary, follow the
procedure below.
1. Place the analyzer in Offline mode by toggling the
Online / Offline
control toggle
(Section 4.3.1) on the
Analysis 2
panel to
Offline
(red).
2. Place the analyzer in back purge mode by pressing the PURGE key on the keypad OR
by placing the X in the
Back Purge
check box on the
Analysis 1
panel.
3. Access the purged control cabinet following proper user company and/or regulatory
agency procedure.
The control cabinet door may NOT be opened while the analyzer is
energized UNLESS the area is known to be non-hazardous. Observe all the
warning labels on the analyzer enclosures.
DO NOT look at the end of disconnected fibres connected to the UV lamp or
place them in contact with skin. The intense UV radiation transmitted
through these fibres can cause eye and skin damage. Fibres should be
capped immediately after disconnection to prevent acidental exposure to
UV radiation.
4. Turn the oven heaters off by locating the Heater AC Power fuse terminal on terminal
block ACTS:25. Lift the fuse terminal tab opening the terminal block and thus
disconnecting the Heater AC Power fuse, as shown in Figure 72.
Содержание 943-TGXeNA
Страница 130: ...Revision 5 130 August 2021 Figure 82 Oven Cabinet Door Removed ...
Страница 131: ...Revision 5 131 August 2021 Figure 83 Control Cabinet Door Removed ...
Страница 132: ...Revision 5 132 August 2021 Figure 84 Power Steam Air Signals Connection Details ...
Страница 133: ...Revision 5 133 August 2021 Figure 85 AC Wiring Schematic ...
Страница 134: ...Revision 5 134 August 2021 Figure 86 DC Signals and Wiring Diagram ...
Страница 135: ...Revision 5 135 August 2021 Figure 87 Flow Diagram ...