Honeywell Searchline Excel Infrared Open Circuit Gas Detector

Honeywell Searchline Excel Infrared Open Circuit Gas Detector

Product positioning and market position

Core positioning: A globally leading infrared open circuit combustible gas detector with over 25000 units installed as of document release. It is widely used in various harsh industrial environments, deployed from the Arctic Circle to the Middle East desert, and is the preferred product for many customers.

Industry benchmark: In 1987, Honeywell first launched the first generation Searchline open circuit infrared combustible gas detector. After upgrading to Searchline Excel in 1998, it became the industry standard in the field of open circuit gas detection with performance that meets and exceeds customer needs. It is often paired with Searchpoint Optima Plus point detectors as the main combustible gas detection solution.

Core application scenarios

Suitable for industrial scenarios with high requirements for combustible gas detection, including:

Offshore platforms and vessels (such as floating production storage and offloading units FPSO)

Downstream chemical processing plants

Natural gas transportation and pipeline system

Large storage areas and factories

Perimeter detection scenario

Core features and advantages of the product

1. Environmental adaptability and reliability

Climate compensation: Using patented dual bandpass filters, it can fully compensate for various weather disturbances such as fog, rain, and mist, ensuring accurate detection under different climate conditions; Simultaneously possessing 100% resistance to light interference, avoiding the influence of sunlight on the detection results.

Endurance to harsh environments: Radial symmetrical and bonded window heating design ensures stable performance in low-temperature environments; High vibration resistance (2-60Hz, maximum peak to peak amplitude 1mm), suitable for industrial equipment vibration scenarios; The shell is made of 316 stainless steel material, with a protection level of IP66 and IP67, and is dustproof and waterproof.

Partial occlusion compatibility: The coaxial optical design is unique to the industry and can work normally when detecting partial occlusion in the path without the risk of false alarms; Similar products with non coaxial designs are prone to false alarms due to differential attenuation.

2. Performance and efficiency testing

High sensitivity and fast response: The detection range is 0-5 LEL · m (lower explosive limit · m), with a recommended low alarm threshold of 1.0 LEL · m and a high alarm threshold of 3.0 LEL · m. The response speed is fast, with T90 (time to reach 90% of the detection value) less than 3 seconds (under normal operating conditions).

Wide coverage and precise positioning: Supports three path lengths - short (5-40m), medium (40-120m), and long (120-200m). A single device can cover a wider area, reducing the deployment requirements of multi-point detectors; Can indicate the size of the danger zone and help staff quickly determine the risk range.

3. Installation and maintenance convenience

Easy calibration and alignment: equipped with a "locked" alignment tool and high-power, high magnification telescope, the alignment operation is simple and accurate, without the need for additional "software alignment" steps; The True Alignment system can achieve high-precision alignment without the need for subsequent software adjustments.

Low power consumption and convenient monitoring: Low power consumption under all operating conditions (maximum 3.5-5.0W for short-range transmitters, maximum 10-13W for medium and long-range transmitters, and maximum 8W for receivers); Optional Modbus RS485 multi station output, supporting 32 detectors sharing one communication cable, significantly reducing installation and wiring costs; By using XNX universal transmitter or SHC-1 handheld interrogator, local/remote configuration, status monitoring, and fault diagnosis can be achieved, reducing on-site maintenance frequency.

4. Safety certification and compliance

Obtained FM (Factory Mutual) hazardous area certification and performance certification, making it the world's first open circuit gas detector to pass FM performance certification; It also complies with multiple international safety standards such as ATEX, UL, CSA, and is suitable for Class I hazardous areas (such as Class 1 Div 1/Zone 1).

Additional customized testing through FM: Honeywell engineers collaborate with FM to develop specialized simulation tests for scenarios not covered by FM standards such as "partial occlusion" and "fog/mist" to further validate product performance.

Advantages of open circuit gas detection technology (compared to point type detectors)

As a supplementary solution to point detectors, open circuit detectors have the following irreplaceable advantages:

The reliability of the detection has been verified through practical applications, reducing the risk of missed detections (for example, point detectors may miss pipeline leaks, while open circuit detectors can accurately capture them)

Covering a wider area makes it easier to detect leakage points at any location

The response speed is much higher than that of point detectors

Fault safety design: No unexposed fault modes, no problem of detector gas path blockage

The installation position requirements for detectors are lower, and there is no need to strictly align with potential leakage points

Easy installation and debugging, can replace multiple point detectors, and reduce overall deployment costs

Technical specifications and parameters

Category specific parameters

Detect gases such as methane, ethane, propane, butane, pentane, ethylene, propylene, and butadiene

Path length: Short distance: 5-40m; Medium distance: 40-120m; Long distance: 120-200m

Output signal 4-20mA (maximum loop resistance 600 Ω, supports source/drain output); RS485； 21mA over range, 2-3mA fault signal (user programmable)

Digital output needs to be paired with DX100 (M) or XNX universal transmitter with Modbus option, supporting Modbus RS485 multi station output

Environmental parameters: Operating humidity: 0-99% RH (non condensing); Work pressure: 91.5-105.5kPa (without pressure compensation)

Power supply and power consumption: 18-32VDC; Power consumption: Short range Tx 3.5-5.0W, medium to long range Tx 10-13W, Rx 8W (all maximum values)

Physical specifications and weight (including installation bracket): Short distance Tx 3.5kg, medium to long distance Tx 7kg, Rx 3.5kg; Alignment tolerance ± 0.5 °

Certification and Standard Performance Certification: FM; Safety Certification: ATEX, UL, CSA, GOST; EMC standard: EN50270

Preheating time ready:<5 minutes; Completely stable:<1 hour

Installation configuration and accessories

1. Installation options

Support multiple installation combinations for hazardous and safe areas, adapting to different control systems. Common solutions include:

Searchline Excel+DX100 (M) (UL/CSA/FM certified)+Controller/DCS/PLC

Searchline Excel+junction box (such as OTB122)+controller

Searchline Excel+XNX universal transmitter+controller/DCS/PLC (supports redundant 4-20mA signal, HART protocol)

Multi station Modbus output: Connect 32 detectors with a single cable to reduce wiring costs and support bidirectional digital communication (configuration, alarm, fault diagnosis)

2. Core accessories and functions

XNX universal transmitter: provides local display and supports HART ®、 Modbus、 Foundation Fieldbus ™） Waiting for interfaces to enhance compatibility between devices and control systems

SHC-1 handheld interrogator: equipped with a protection module, it can perform local invasive configuration and diagnosis of the detector in allowed scenarios

Telescope installation mechanism: a unique three-point installation benchmark ensures alignment accuracy; The perspective can be adjusted to the most convenient position without the need for subsequent software adjustments