12 Chapter 3 Overview
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
3.7Searchline Excel Edge - Long Range Perimeter Monitoring Open Path Flammable
Hydrocarbon Gas Detector
Searchline Excel Edge is a long-range Open Path Flammable Hydrocarbon Gas Leak Detector for Perimeter line protection.
By encircling a plant, storage area or process area, a flammable gas cloud leaving or entering that area is detected and
an alarm raised.
The 330 m (1,082 ft) range enables large areas to be protected. At extended ranges the perimeter detection may be
affected by particularly thick fog, but will be re-established when fog lessens or lifts. The device status is available at all
times as part of the advanced diagnostics.
Searchline Excel Edge is a cost-effective way of showing environmental diligence and also protecting plants from external
emissions.
3.8Transmitter/Receiver Overview
Each type of Searchline Excel gas detector consists of two units, a transmitter and a receiver. This separate co-operative
transmitter/receiver configuration provides a reliable basis for open path gas detection.
Figure 1.Transmitter and receiver general view
When designing an installation for Searchline Excel Plus or Searchline Excel Edge it is important that the correct
application and open path flammable hydrocarbon gas detector is selected and specified.
There are two versions of the new advanced Searchline Excel available:
• Searchline Excel Plus - a medium range 2 m to 120 m (6 ft to 393 ft) safety product.
• Searchline Excel Edge – a long range 60 m to 330 m (196 ft to 1082 ft) perimeter monitoring product.
The transmitter and receiver are both supplied with a robust Universal Mounting Bracket as standard. This allows
mounting to walls, pipes and other infrastructure, within the limitations of this Manual. With 3 degrees of freedom and
fine tuning, simple and repeatable alignment of the transmitter and receiver is achieved. Installation details are given in
Chapter 7 Alignment and Commissioning.
The transmitter and receiver must be installed in horizontal level (+/- 45 degrees tilt).
3.9Transmitter
The Searchline Excel Plus & Searchline Excel Edge transmitter delivers an intense, collimated infrared beam produced by
a Xenon arc flashlamp. In order to prevent potentially annoying visible flashes, the visible emissions from the flashlamp are
blocked by a filter.
Note
The infrared beam is invisible and eye safe.
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