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Honeywell Searchline Excel Open Path Gas Detector

Honeywell Searchline Excel is the World’s best selling infrared open path gas detector.  There are over 25,000 units installed in challenging applications throughout industry. From the Arctic Circle to middle eastern deserts, customers have repeatedly selected Honeywell Searchline Excel as their preferred choice.


Honeywell Analytics pioneered the original design of open path infrared flammable gas detectors with the introduction of the original Searchline back in 1987. Since then Honeywell have continued to work in conjunction with major international oil and gas companies to fully understand the demanding application requirements of these systems. In 1998 Honeywell introduced Searchline Excel which has become the industry standard for open path gas detection by meeting and exceeding all customer driven demands.  With continuous improvement and the highest quality manufacturing and control processes, Honeywell Analytics Searchline Excel Open Path flammable gas detector provides best in class gas detection. Searchline Excel is often the chosen primary flammable gas detector in conjunction with Searchpoint Optima Plus as complimenting flammable point detection


Why open path gas detection?

Open path detectors complement the use of individual point detectors and offer many significant benefits including:

  • Reliable flammable gas detection, proven in use
  • Wider area coverage – most likely to pick up any leak
  • Very high speed of response
  • Failsafe – no unrevealed failure modes
    – no possibility of blocked gas path to detector
  • Detector location not as critical
  • Indicates size of hazard
  • Simple set up and commission
  • Replaces multiple point devices


Searchline Excel is totally immune to interference from sunlight or any other sources of radiation such as flare stacks, arc welding or lightning.  This is achieved by using a xenon flash lamp that is actually brighter than the sun at the infrared detection wavelengths and solid state detectors with a wide dynamic range. The lamp is also modulated to have a unique pulse duration and shape. The receiver then uses high speed digital signal processing to validate that all the signals received have this unique signature and rejects any extraneous signals.


Honeywell Searchline Open Path Gas Detector Specifications

  • Available Gases: Methane, Ethane, Propane, Butane, Pentane, Ethylene, Propylene, Butadiene
  • Range: 0 to 5 LEL.m
  • Recommended Alarm Settings: (Low) 1.0 LEL.m; (high) 3.0 LEL.m
  • Path Lengths: Short Range 5m to 40m, Medium Range 40m to 120m and Long Range 120m to 200m
  • Speed of Response: T90 less than 3 seconds. (under normal operating conditions)
  • Output signal: 4-20mA Normal operation (0 to 5 LEL.m) (maximum loop resistance 600 ohms; source & sink available) and RS485
    • Fault diagnostics: 21mA Over range, 3mA(1) Dirty optics, 2.5mA(1) Beam blocked, 2mA(1) 0mA Fault
  • Digital Output: Modbus RS485 multi drop. Using DX100 (M) or XNX Universal Transmitter with Modbus option
  • Operating Conditions: -40…+65°C, 0…99%RH (non-condensing) and 915…1055mbarA (non-compensated)
  • Warm up time within 5 minutes (operational) to less than 1 hour fully stabilised
  • Power Supply: 18…35Vdc
  • Power consumption: Short Range Tx: 3.5W / 5.0W *maximum. Medium and Long Range Tx: 10W / 13W* maximum. Rx: 8W maximum
  • Enclosure Material: 316 stainless steel to IP66 and IP67
  • Weight (inc. mounting bracket): Short Range TX: 3.5kg Medium and Long Range TX: 7kg RX: 3.5kg
  • Vibration: 2 to 60Hz, max ptp amplitude 1mm
  • Misalignment Tolerance: Short Range ±0.5º (±~35cm at 40m). Medium Range ±0.5º (±~104cm at 120m). Long Range ±0.5º (±~170cm at 200m)
  • EMC Standards: EN50270
  • Performance Approval: FM performance approved
  • Safety Approval: ATEX, IECEx, UL, CSA, FM and GOST (see datasheet for details)


Fluidic hold a distribution agreement with Honeywell Analytics.  Our instrumentation engineers are product trained and able to help with instrument selection within the full Honeywell instrumentation portfolio.  Please contact either office for more information (Glasgow 0141 641 5920 or Warrington 01925 572401).



  • Download Honeywell Searchline Excel Datasheet
  • Download Honeywell Searchline Excel Install Guide
  • Download Honeywell Searchline Excel Technical Handbook
  • Download Honeywell Searchline Excel Spare Parts
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