HTS Eclipse – ATJ Atmospheric Injectors

Overview

The Eclipse ATJ Atmospheric Injector is a pre-mix gas-air mixing device designed for use in atmospheric burner applications. Operating on the venturi (injector) principle, the ATJ draws in the required quantity of primary combustion air from the surrounding atmosphere using the kinetic energy of the gas jet, delivering a pre-mixed gas-air stream to the burner head without the need for a powered air supply.

The ATJ series is available in configurations for a wide range of gas types including natural gas (low, medium, high), propane, butane-air, coke oven gas, coke oven-water gas, carburetted water gas, and manufactured gas. This flexibility makes the ATJ suitable for diverse combustion systems across industrial and commercial heating applications.

Features & Benefits

• Venturi (atmospheric injection) principle — no powered air blower required, reducing system complexity and energy consumption
• Multiple gas type configurations — available for natural gas (low, medium, high), propane, butane-air, coke oven, coke oven-water, carburetted water gas, and manufactured gas
• Pre-mix design — delivers a homogeneous gas-air mixture to the burner for stable, efficient combustion
• Compact construction — integrates directly into atmospheric burner assemblies without additional mixing chambers
• Wide application range — supports diverse industrial and commercial combustion processes across multiple fuel gas types
• Documented spare parts availability — spare part list published for field serviceability

Technical Specifications

• Operating principle: Atmospheric injection (venturi/injector type)
• Primary air supply: Atmospheric (no powered air required)
• Gas types supported: Low natural gas, medium natural gas, high natural gas, propane, butane-air, coke oven gas, coke oven-water gas, carburetted water gas, manufactured gas (MFD)
• Data sheet edition: 01.15 (08.01.2015)
• Product range document: FSG Atmospheric Injector, edition 02.21 (10.02.2021)
• Refer to published data sheet and gas-specific technical information sheets for detailed capacity, pressure, and sizing data

Applications

• Atmospheric pre-mix gas burners in industrial and commercial heating equipment
• Natural gas-fired heating systems requiring pre-mixed combustion without powered air
• Propane and butane-air burner assemblies
• Specialty gas applications including coke oven, coke oven-water, and carburetted water gas combustion systems
• Manufactured gas (MFD) burner installations
• OEM burner packages requiring a standardized venturi mixing component

Models / Configurations

• ATJ – Natural Gas (Low) – Atmospheric injector configured for low Wobbe index natural gas
• ATJ – Natural Gas (Medium) – Atmospheric injector configured for medium Wobbe index natural gas
• ATJ – Natural Gas (High) – Atmospheric injector configured for high Wobbe index natural gas
• ATJ – Natural Gas (MFD) – Atmospheric injector configured for manufactured natural gas
• ATJ – Propane – Atmospheric injector configured for propane (LPG)
• ATJ – Butane-Air – Atmospheric injector configured for butane-air gas mixtures
• ATJ – Coke Oven – Atmospheric injector configured for coke oven gas
• ATJ – Coke Oven-Water – Atmospheric injector configured for coke oven-water gas
• ATJ – Carburetted Water Gas – Atmospheric injector configured for carburetted water gas

ATJ Atmospheric Injector Accessories

Refer to the ATJ spare part list for documented replacement components applicable to this product family.

• Spare Parts – Factory-documented replacement components; refer to the ATJ Spare Part List (docuthek edition 01.15) for complete listing

Documentation