--- title: "Honeywell Searchline Excel Open Path Gas Detector" description: "Wide-area line-of-sight infrared monitor mapping explosive gas plume pathways up to 200m along maritime port loading boundaries." canonical_url: "https://nodewave.net/store/gas-detection/searchline-excel" last_updated: "2026-10-04T04:05:23.888Z" --- **Wide-Area Perimeter Gas Shield:** The Searchline Excel open path infrared monitor continuously maps flammable gas plume pathways over distances up to 200 meters. Its patented optical architecture ensures 100% solar immunity and uncompromised measurement in extreme marine conditions including rain, fog, and sea spray. ## Executive Summary & Core Capabilities The **Honeywell Searchline Excel** is the industry-standard open path infrared gas detection system designed to monitor combustible hydrocarbon vapors across open distances. While point gas detectors protect localized equipment nodes, open path detectors create a line-of-sight optical barrier that intercepts migrating gas clouds along facility boundaries, jetties, and marine port transfer zones. Constructed from heavy-duty **316 stainless steel** with **IP66/IP67** ingress sealing, the Searchline Excel system comprises a specialized Transmitter and Receiver pair. It provides continuous path-integrated concentration measurement up to **5 LEL.m**, reacting to combustible gas leaks in under 3 seconds. Siting for Coastal & Marine Environments: When mapping boundary protection at jetty loading arms, orient the optical path perpendicular to prevailing coastal winds. This layout optimizes interception speed for migrating flammable vapor clouds before they breach safe port zones.

- **Wide Boundary Protection:** Monitors up to 200 meters in a single straight line, replacing dozens of individual point gas detectors along fence lines and loading docks. - **100% Solar & Environmentally Immune:** Advanced optical filtering prevents blinding or false alarms from direct sunlight, flare stack reflection, arc welding, or heavy marine fog. - **High-Speed Alarm Warning:** Triggers safety systems within 3 seconds of gas plume detection, giving site operators time to initiate automated emergency shutoffs. - **All-Weather Reliability:** Integrated window heating keeps optical lenses clear of ice, frost, and sea spray condensation in severe arctic or coastal environments.

The Searchline Excel optical engine employs a **coaxial optical design** paired with a patented **double band pass filter** system. Standard open path gas monitors use two spectral channels (active and reference), which are vulnerable to differential light scattering caused by rain droplets or fog. By utilizing double band pass filters, Searchline Excel measures baseline sample radiation alongside dual reference bands. This cancels out differential optical scattering from fog and atmospheric moisture, ensuring accurate

0\text{ to }5\text{ LEL.m}

0 to 5 LEL.m path-integrated readings even under severe partial beam obscuration.

--- ## Technical Specifications & Performance Matrix

Metrology Parameter	Engineering Specification
Detection Technique	Open Path Infrared Absorption Spectroscopy
Measuring Range	$0\text{ to }5\text{ LEL.m}$ 0 to 5 LEL.m (Path Integrated Concentration)
Short Range Path Length	$5\text{ m to }40\text{ m}$ 5 m to 40 m ( $15\text{ to }130\text{ ft}$ 15 to 130 ft )
Medium Range Path Length	$40\text{ m to }120\text{ m}$ 40 m to 120 m ( $130\text{ to }390\text{ ft}$ 130 to 390 ft )
Long Range Path Length	$120\text{ m to }200\text{ m}$ 120 m to 200 m ( $390\text{ to }650\text{ ft}$ 390 to 650 ft )
Speed of Response	$T_{90} < 3\text{ seconds}$ T 90 < 3 seconds (under normal conditions)

Interface Component	Technical Profile
Analog Output Signal	$4\text{ to }20\text{ mA}$ 4 to 20 mA (Autosensing Sink or Source)
Diagnostic Signal Currents	$2.0\text{ mA}$ 2.0 mA (Fault), $2.5\text{ mA}$ 2.5 mA (Beam Blocked), $3.0\text{ mA}$ 3.0 mA (Dirty Optics)
Digital Signaling	Modbus RS485 multi-drop (via DX100/XNX transmitter)
Power Input Voltage	$18\text{ to }32\text{ VDC}$ 18 to 32 VDC
Power Consumption	Tx: $3.5\text{W to }13\text{W}$ 3.5 W to 13 W max; Rx: $8\text{W}$ 8 W max

Compliance Metric	Specification
Enclosure Metallurgy	316 Stainless Steel
Ingress Enclosure Rating	IP66 / IP67
Operating Temperature	$-40\text{ °C to }+65\text{ °C}$ − 40 °C to + 65 °C ( $-40\text{ °F to }+150\text{ °F}$ − 40 °F to + 150 °F )
Functional Safety Rating	IEC 61508 SIL 2 certified
Hazardous Area Approvals	ATEX, IECEx, UL, CSA, FM Class 1 Div 1

--- ## Target Industry Applications Maps fugitive flammable gas plume pathways along ship-to-shore loading lines, LNG jetty barriers, and marine transfer manifolds. Forms a non-intrusive boundary shield around storage tank farms, gas processing plants, and boundary fence lines prone to airborne gas migration. --- ## Official Provider Resources & In-Depth Documentation For complete technical handbooks, safety system integration guides, and direct support from Honeywell's engineering team, explore the official manufacturer portals below: Access official technical documentation, region-specific hazardous certificates, and installation resources directly from Honeywell. Explore the full portfolio of optical, open-path, and point gas detection solutions engineered for hazardous industrial environments.