110
MAN0530 Issue 09 October 03
Searchline Excel
2104M0506
Latch-style Trident-type telescope assembly
If this type of alignment telescope was used with a Trident-type Excel gas detector, there is no
need to further optimise the alignment using the SHC1 Handheld Interrogator.
If this type of alignment telescope was used with a non-Trident Excel it may be necessary to
further optimise the alignment in the following way in order to achieve best performance.
(a) After the
SIG
and
TGT
bar graphs are displayed on the SHC1 screen as previously
described, let the
TGT
level reach its initial maximum by waiting for approximately
10 seconds.
During this time the
TGT
level will move up towards the current
SIG
level.
(b) Whilst watching the
SIG
level closely, make a
small
mechanical adjustment in either
the horizontal or vertical alignment and note whether the
SIG
level goes up or down.
(c) If the
SIG
level goes
up
, make another
small
mechanical adjustment in the same
direction as before.
(d) If the
SIG
level goes
down
, change the direction of adjustment.
Maximise the
SIG
level by making
small
adjustments in only
one plane
at a time.
(e) When the
SIG
level has been maximised in one plane, make small adjustments in
the other plane until
SIG
has been maximised in this plane.
(f)
Repeat steps (b) to (e) until the
SIG
level has been maximised in both planes.
At this point,
SIG
must be bigger than the initial
TGT
level and any adjustment either
side of the current alignment must result in a reduction in signal level.
If not, repeat steps (b) to (e) until these requirements have been met.
(g)
Lock off the alignment by placing a hex (Allen) key in the pair of grub-screws
which control adjustment in a particular plane and simultaneously rotating them
in opposite directions.
(h)
Repeat this for the other pair of grub-screws.
(i)
Press
Enter
and the signal levels are checked.
Provided that the
SIG
level is greater than the
TGT
level, the signal check should pass on to the
next stage of installation.
Initialisation
This starts the initialisation process. The following message is displayed:
Press Enter to
Initialise Unit
This message is displayed during the initialisation process after pressing
Enter
.
Processing Data
Please Wait
This message is displayed for three seconds at the end of a successful initialisation process.
APPENDIX A - HANDHELD INTERROGATOR
