Searchline Excel Open Path Infrared Gas Detector 

World renowned infrared open path flammable gas detector offering unrivalled performance and sensitivity.

The Searchline Excel is the World’s best selling infrared open path gas detector with over 6,000 units installed in challenging applications throughout industry. From the Arctic Circle to Middle Eastern Deserts, customers have repeatedly selected the Searchline Excel as their preferred choice.

The fundamental design of Searchline Excel has remained the same since its original launch and it continues to lead the field. 

Searchline Excel is totally immune to interference from sunlight or any other sources of radiation such as flare stacks, arc welding or lightning.

The patented optical design used in Searchline Excel has proven itself as the only solution available that fully addresses all the challenges of open path gas detection. Unlike some competitive devices, it does not try to hide fundamental design inadequacy with the use of software masks that can compromise the unit’s ability to detect gas.

Searchline Excel employs a patented double band pass filter that fully compensates for all types of fog and / or rain, thereby allowing it to continue to operate accurately and reliably in all climatic conditions.

Features & Benefits Accessories Technical Library Image Gallery

Why open path gas detection?
Open path detectors complement the use of individual point detectors and offer many significant benefits including:

•  Wider area coverage - most likely to pick up any leak
•  Very high speed of response
•  NO unrevealed failure modes - no possibility of blocked gas path to detector
•  Detector location not as critical
•  Indicates size of hazard


Sample and reference detector alignment
•  Reduced sensitivity to alignment
•  Guaranteed performance
•  Reduced sensitivity to partial obscuration


Improved hand-held software
•  Simple confirmation of alignment
•  Visual indication of target and current signal levels
•  Compatible with existing systems


Improved telescope
•  High Power Rifle Telescope
•  Easier to align with greater zoom and magnification
•  Robust shock resistant design


Features & benefits
•  Fast speed of response provides earliest warning
•  High sensitivity allows low alarm set points
•  Alignment free design makes installation simple
•  Duct flex and vibration tolerance keeps  the system online
•  Integral functional gas test facility allows for simple system check
•  Contamination resistant optics reduce the need for unscheduled maintenance
•  Not affected by interference from water vapour
•  Immune to catalytic poisons
•  Works in inert atmospheres

•   Deluge shield / sunshade
•   True alignment system
•   Gassing cell
•   Hand-held interrogator
•   Optical gas test filters
•   SHC protection device
Public Documents
Date Title Type File Size
16 Jun 10 Searchline Excel Datasheet 440 kb
29 May 09 Searchline Excel Performs Through Water Curtain 226 kb
29 Oct 09 Gas Book Americas Gas Book 5,365 kb
16 Jun 10 Searchline Excel Spec Sheet 196 kb
16 Dec 10 Functional Safety 267 kb
01 Apr 13 Fixed-Point Industrial Fire and Gas Detection Brochure 1,194 kb
27 Feb 13 Fire and Gas Detection for the Petrochemical Industry Brochure 536 kb

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  Restricted Documents
Date Title Type File Size
29 May 09 Searchline Excel Cross Duct Installation Guide Manual / Supplement 557 kb
29 May 09 Searchline Excel Installation Guide Manual / Supplement 385 kb
29 May 09 Searchline Excel Open Path annd Cross Duct Technical Handbook Manual / Supplement 4,937 kb
29 May 09 Searchline Excel Reflector Panel Heater Installation Guide Manual / Supplement 623 kb
06 Oct 10 Engineering Specifications Manual / Supplement 130 kb
20 Jun 12 Searchline Excel Technical Handbook Manual / Supplement 6,016 kb
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 Gas Detection Explained

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