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MAN0530 Issue 09 October 03 Searchline Excel
2104M0506
There are five ranges of Searchline Excel gas detector. These are:
Open-Path Short Range 5 — 40m (15ft — 130ft)
Medium Range 20 — 120m (65ft — 390ft)
Long Range 120 — 200m (390ft — 650ft)
Cross-Duct Short Range: 0.5 — 2.5m (20in — 8ft)
Long Range: 2.5 — 5m (8ft — 15ft)
See Chapter 4 for details of the Cross-Duct Excel.
When designing an installation for Searchline Excel it is important that the correct range of the
gas detector for each path to be monitored is selected and specified.
Note: In order to avoid the problems associated with gas detectors being used beyond their
specified ranges or when incorrectly aligned, an Instrument Assisted Alignment (IAA)
procedure for Searchline Excel checks for correct gas detector type, operating range
and signal levels before allowing the gas detector to activate.
The Transmitter and Receiver are each mounted upon robust, adjustable mounting brackets.
These brackets bolt to a mounting plate, which is designed to accommodate a variety of junction
boxes, accessories and mechanical mounting configurations. The small size and flexibility of
Searchline Excel and its mounting arrangements are intended to make correct installation design
as simple as possible. Installation details are given in Chapter 3.
2.2 TRANSMITTER
The Searchline Excel Transmitter produces an intense, collimated infrared beam which is produced by a
Xenon arc flashlamp.
The flashlamp s infrared output is collimated using mirrors which enables a more uniform beam
(no chromatic aberrations) to be produced and hence reduces alignment sensitivity. In order to
prevent annoying visible flashes, the visible emissions from the flashlamp are blocked by a
filter.
The Transmitter s flashlamp is pulsed at precisely 4Hz, each pulse lasting for approximately
one microsecond. The precise timing and extremely short duration of these pulses give the
Transmitter a very distinctive signature. This distinctive signature makes it easy for the Receiver
to distinguish Searchline Excel Transmitter pulses from both natural and artificial sources of
infrared radiation.
NOTE: THE INFRARED BEAM IS INVISIBLE AND EYE SAFE.
The medium and long range Transmitters contain a higher power flashlamp and larger optics
than the standard short range unit. The resulting infrared beam is many times brighter which
allows for a considerable increase in operating range.
2. OVERVIEW
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