Honeywell Searchline Excel Fixed Gas Detector

Overview

Honeywell Searchline Excel Open Path Fixed Gas Detector | Infrared (IR) Flammable Gas Detection for Marine, Offshore & Industrial Applications

The Honeywell Searchline Excel Open Path Fixed Gas Detector is a high-performance open path infrared (IR) gas detection system designed for continuous monitoring of combustible hydrocarbon gases in hazardous industrial and marine environments. Unlike conventional point gas detectors that monitor gas concentration at a single location, the Searchline Excel detects gas leaks over an extended optical path between a transmitter and receiver, providing rapid and reliable detection across large areas.

Using advanced infrared absorption technology, the Honeywell Searchline Excel continuously monitors the atmosphere for hydrocarbon gas leaks while remaining highly resistant to false alarms caused by environmental conditions. Its long-range monitoring capability makes it an ideal solution for protecting critical facilities where early gas leak detection is essential for personnel safety, environmental protection, and asset integrity.

The Honeywell Searchline Excel is widely installed on offshore oil & gas platforms, FPSOs, LNG terminals, petrochemical plants, oil refineries, compressor stations, tank farms, marine vessels, loading terminals, and industrial processing facilities where combustible gas leaks may occur over large open areas.

Engineered for demanding hazardous locations, the Searchline Excel features a rugged explosion-proof enclosure, automatic optical alignment assistance, built-in diagnostics, advanced signal processing, and excellent immunity to fog, rain, snow, sunlight, and airborne contaminants. The detector supports industry-standard 4–20 mA analog output, HART® communication, relay interfaces, and integration with PLC, DCS, SCADA, Fire & Gas, and Emergency Shutdown (ESD) systems, ensuring seamless compatibility with modern industrial safety infrastructures.

Its ability to monitor gas over distances of up to 210 metres (model dependent) significantly reduces the number of detectors required to protect large facilities, lowering installation costs while improving overall safety coverage.

Key Features of Honeywell Searchline Excel Open Path Fixed Gas Detector

The Honeywell Searchline Excel combines advanced infrared technology, long-range monitoring, and intelligent diagnostics to deliver dependable combustible gas detection.

Open Path Infrared (IR) Gas Detection

Unlike point gas detectors, the Searchline Excel monitors gas concentration across an entire optical beam between the transmitter and receiver.

Benefits include:

• Continuous area monitoring

• Faster gas leak detection

• Coverage of large hazardous zones

• Reduced number of detectors required

• Early detection of large gas releases

Long Detection Range

The Honeywell Searchline Excel is available with multiple measuring ranges to suit different applications.

Typical coverage includes:

• Short-range installations

• Medium-range industrial applications

• Long-range monitoring up to approximately 210 metres (configuration dependent)

This makes the detector suitable for protecting large industrial facilities with fewer detection points.

Advanced Infrared Technology

The Searchline Excel utilizes proven infrared absorption technology to accurately detect combustible hydrocarbon gases.

Advantages include:

• High accuracy

• Fast response time

• Excellent long-term stability

• Low maintenance

• High reliability

• Immunity to sensor poisoning

Unlike catalytic detectors, infrared technology is not affected by silicone or sulphur contamination.

Intelligent Optical Monitoring

The detector continuously monitors:

• Optical signal quality

• Lens contamination

• Beam alignment

• Internal diagnostics

• Detector health

This allows maintenance teams to identify issues before they affect performance.

Automatic Optical Alignment Assistance

Installation and commissioning are simplified through alignment aids that help engineers accurately position the transmitter and receiver.

Benefits include:

• Reduced installation time

• Easier commissioning

• Improved long-term reliability

• Simplified maintenance

Rugged Industrial Construction

The Honeywell Searchline Excel is designed for harsh industrial environments.

Features include:

• Explosion-Proof Housing

• Marine-Grade Construction

• Corrosion-Resistant Materials

• UV Resistant Finish

• Weatherproof Design

• Long Service Life

Suitable for both indoor and outdoor hazardous locations.

Advanced Communication

The Searchline Excel integrates easily with industrial automation systems.

Supported interfaces include:

• 4–20 mA Analog Output

• HART® Communication

• Relay Outputs

• PLC Integration

• DCS Integration

• SCADA Integration

• Fire & Gas Systems

International Hazardous Area Certifications

The Honeywell Searchline Excel complies with major global safety standards including:

• ATEX

• IECEx

• UL

• CSA

• FM

• CE

This enables installation in hazardous industrial locations worldwide.

Benefits of Honeywell Searchline Excel

The Honeywell Searchline Excel offers numerous operational and economic benefits.

Key Benefits

• Large area gas monitoring

• Faster leak detection

• Reduced detector quantity

• Lower installation costs

• Improved personnel safety

• Reliable infrared technology

• No catalytic sensor poisoning

• Excellent environmental resistance

• Reduced maintenance requirements

• High system availability

• Long operational life

• Worldwide hazardous area approvals

Why Choose Honeywell Searchline Excel?

The Honeywell Searchline Excel is trusted by operators worldwide because it provides reliable combustible gas monitoring over long distances where conventional point detectors cannot offer sufficient coverage.

Its open path infrared technology enables earlier detection of gas leaks across large process areas, improving safety while reducing the total number of detectors required. This results in lower installation costs, simplified maintenance, and improved operational efficiency.

For marine, offshore, petrochemical, LNG, refinery, and industrial facilities seeking dependable long-range gas detection, the Searchline Excel remains one of the industry's leading open path gas detection solutions.

Working Principle

The Honeywell Searchline Excel operates using infrared absorption spectroscopy. The transmitter emits a controlled infrared beam toward the receiver positioned across the monitoring area.

When hydrocarbon gases enter the optical path, they absorb specific infrared wavelengths. The receiver measures this absorption and calculates the gas concentration expressed in LEL·m (Lower Explosive Limit × metres).

The detector continuously analyzes the optical signal while compensating for environmental influences such as rain, fog, sunlight, and dust. If gas concentrations exceed preset alarm thresholds, the Searchline Excel activates alarm outputs and transmits measurement data through 4–20 mA and HART® communication to connected safety systems.

Typical Applications

The Honeywell Searchline Excel is widely used in:

Marine & Shipping

• Oil Tankers

• LNG Carriers

• FPSOs

• Offshore Support Vessels

• Cargo Pump Rooms

• Deck Hazardous Areas

Offshore Oil & Gas

• Offshore Platforms

• Drilling Rigs

• Production Modules

• Compressor Stations

• Wellhead Platforms

LNG & LPG Facilities

• LNG Import Terminals

• LNG Storage Tanks

• LPG Storage Facilities

• Loading Arms

• Cryogenic Processing Areas

Petrochemical Industry

• Refineries

• Chemical Plants

• Hydrocarbon Processing Units

• Solvent Storage Areas

• Tank Farms

Industrial Facilities

• Power Generation Plants

• Gas Compressor Stations

• Pipeline Installations

• Fuel Storage Depots

• Hazardous Process Areas

Detection Technology

Open Path Infrared (IR) Technology

The Honeywell Searchline Excel uses Open Path Infrared (IR) Absorption Technology to continuously monitor combustible gas concentrations across an optical beam.

Unlike conventional point gas detectors that monitor only a single location, the Searchline Excel monitors an entire protected zone between the transmitter and receiver.

Advantages

• Large area monitoring

• Faster gas leak detection

• Reduced detector quantity

• Early warning of large gas releases

• High measurement accuracy

• Stable long-term performance

• Immune to catalytic sensor poisoning

• Excellent environmental performance

Gas Types Detected

The Honeywell Searchline Excel is optimized for detecting combustible hydrocarbon gases.

Typical gases include:

• Methane (CH₄)

• Ethane

• Propane

• Butane

• Pentane

• LPG

• LNG Vapours

• Natural Gas

• Hydrocarbon Vapours

• Mixed Hydrocarbon Gases

The detector is specifically designed for hydrocarbon gas monitoring and is widely used in oil & gas and petrochemical industries.

Measuring Ranges

The Searchline Excel is available in multiple path length configurations depending on application requirements.

Typical monitoring distances include:

• Short Range: 5–40 metres

• Medium Range: 40–120 metres

• Long Range: Up to 210 metres

The appropriate model is selected based on site layout, environmental conditions, and required coverage.

Measurement Principle

The Searchline Excel measures gas concentration in:

LEL·m (Lower Explosive Limit × Metres)

This measurement represents both:

• Gas concentration

• Length of the gas cloud

This provides superior protection compared to conventional point detectors by detecting gas clouds across an entire protected area.

Intelligent Diagnostics

The Honeywell Searchline Excel continuously performs automatic diagnostics to ensure reliable operation.

The system monitors:

• Optical Signal Strength

• Lens Contamination

• Beam Alignment

• Internal Electronics

• Environmental Compensation

• Detector Health Status

These diagnostics help reduce downtime and improve maintenance planning.

Environmental Performance

The Searchline Excel is designed to operate reliably under demanding environmental conditions.

Features include:

• Rain Compensation

• Fog Compensation

• Snow Compensation

• Sunlight Rejection

• Dust Resistance

• Vibration Resistance

• Marine Environment Protection

This ensures stable performance in both offshore and industrial installations.

Communication & Outputs

The Honeywell Searchline Excel supports industry-standard communication for easy integration.

Standard Output

• 4–20 mA Analog Output

Digital Communication

• HART® Protocol

Compatible Systems

The detector integrates with:

• PLC Systems

• DCS Systems

• SCADA Systems

• Fire & Gas Systems

• Emergency Shutdown Systems (ESD)

• Building Management Systems (BMS)

Installation Features

The Honeywell Searchline Excel has been engineered for efficient installation and commissioning.

Installation features include:

• Long Distance Optical Monitoring

• Automatic Optical Alignment Assistance

• Easy Mechanical Mounting

• Marine-Grade Construction

• Explosion-Proof Housing

• Weatherproof Design

• Minimal Routine Maintenance

Industries Served

The Honeywell Searchline Excel is widely trusted across hazardous industries.

Marine Industry

• Oil Tankers

• LNG Carriers

• Offshore Support Vessels

• Cargo Pump Rooms

• Hazardous Deck Areas

Offshore Oil & Gas

• Offshore Platforms

• FPSOs

• Drilling Rigs

• Production Modules

• Compressor Stations

LNG & LPG Facilities

• LNG Import Terminals

• LNG Storage Tanks

• LPG Storage Facilities

• Loading Arms

Petrochemical Industry

• Refineries

• Chemical Plants

• Hydrocarbon Processing Units

• Tank Farms

• Solvent Storage Areas

Industrial Manufacturing

• Power Plants

• Gas Compressor Stations

• Fuel Storage Depots

• Pipeline Installations

• Hazardous Processing Areas

Certifications & Compliance

The Honeywell Searchline Excel complies with internationally recognized safety standards.

Typical certifications include:

• ATEX

• IECEx

• UL

• CSA

• FM

• CE

• SIL 2 Suitable (Application Dependent)

These certifications make the detector suitable for hazardous industrial and marine environments worldwide.